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LIGGGHTS®.
CREATE_ATOMS COMMAND Description¶. This command creates atoms on a lattice, or a single atom, or a random collection of atoms, as an alternative to reading in their coordinates explicitly via a read_data or read_restart command. A simulation box must already exist, which is typically created via the create_box command. Before using this command, a lattice must also be defined using the lattice command. FIX PARTICLETEMPLATE/MULTISPHERE COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
FIX PARTICLETEMPLATE/SUPERQUADRIC COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
LIGGGHTS® - USER FORUM 10. By mschramm 3 weeks 4 days ago. Normal topic. wall force. By hansmannb 7 years 5 months ago. 4. By Kashminder 3 weeks 4 days ago. Normal topic. Calculating Unbalanced force within LIGGGHTS script. FORCEMODEL_GRADPFORCE COMMAND The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The gradPForce model is a model that calculates the particle based pressure gradient force - (grad (p)) * Vparticle (see Zhou et al. (2010): “Discrete particle simulation of particle-fluid flow: model formulations and their FIX INSERT/PACK COMMAND Description for fix insert/pack: This command must use the region keyword to define an insertion volume. The specified region must have been previously defined with a region command. Dynamic regions are not supported as insertion region. Each timestep particles are inserted, they are placed randomly inside the insertion volume. FIX PARTICLEDISTRIBUTION/DISCRETE COMMAND Description¶. Define a discrete particle distribution that defines a discrete particle distribution to be inserted by a fix insert/stream, fix insert/pack, fix insert/rate/region or a related command. It takes several templates of type fix_particletemplate_sphere as input, which define the properties of the single particles (such as radius, density that are part of the distribution. FIX WALL/GRAN COMMAND The keyword temperature is used to assign a constant temperature to the wall. This setting gets effective in conjunction with heat conduction via fix heat/gran/conduction.For wallstyle mesh, the value for the temperature given in this command is ignored and the temperature value is specified per mesh via fix mesh/surface.Contact area calculation can be controlled by keyword contact_area in the LIGGGHTS(R)-PUBLIC DOCUMENTATION, VERSION 3.X LIGGGHTS (R) Version info:¶ All LIGGGHTS (R) versions are based on a specific version of LIGGGHTS (R), as printed in the file src/version.h LIGGGHTS (R) versions are identidied by a version number (e.g. ‘3.0’), a branch name (which is ‘LIGGGHTS(R)-PUBLIC’ for your release of LIGGGHTS), compilation info (date / time stamp and user name), and a LAMMPS version number (which is the LAMMPS COUPLE/CFD/FORCE COMMAND Description¶. The command couple/cfd/force can only be used in combination with fix_couple_cfd. This model transfers the force that the fluid exceeds on each particle to the DEM calculation. At every coupling time step the force term, which contains contributions from all force models active in the CFD calculation, is passed on toLIGGGHTS®.
CREATE_ATOMS COMMAND Description¶. This command creates atoms on a lattice, or a single atom, or a random collection of atoms, as an alternative to reading in their coordinates explicitly via a read_data or read_restart command. A simulation box must already exist, which is typically created via the create_box command. Before using this command, a lattice must also be defined using the lattice command. FIX PARTICLETEMPLATE/MULTISPHERE COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
FIX PARTICLETEMPLATE/SUPERQUADRIC COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
LIGGGHTS® - USER FORUM 10. By mschramm 3 weeks 4 days ago. Normal topic. wall force. By hansmannb 7 years 5 months ago. 4. By Kashminder 3 weeks 4 days ago. Normal topic. Calculating Unbalanced force within LIGGGHTS script. FORCEMODEL_GRADPFORCE COMMAND The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The gradPForce model is a model that calculates the particle based pressure gradient force - (grad (p)) * Vparticle (see Zhou et al. (2010): “Discrete particle simulation of particle-fluid flow: model formulations and their FIX INSERT/PACK COMMAND Description for fix insert/pack: This command must use the region keyword to define an insertion volume. The specified region must have been previously defined with a region command. Dynamic regions are not supported as insertion region. Each timestep particles are inserted, they are placed randomly inside the insertion volume. FIX PARTICLEDISTRIBUTION/DISCRETE COMMAND Description¶. Define a discrete particle distribution that defines a discrete particle distribution to be inserted by a fix insert/stream, fix insert/pack, fix insert/rate/region or a related command. It takes several templates of type fix_particletemplate_sphere as input, which define the properties of the single particles (such as radius, density that are part of the distribution. ABOUT CFDEM®PROJECT CFDEM®project is an open source software project for computational simulation engines, for these particle and fluid flow processes. - the CFDEM®coupling CFD-DEM software. Every contribution to the open source packages LIGGGHTS® and CFDEM®coupling in the past is mentioned in the release notes. Work from all across theCFDEM®project
SET COMMAND
Description¶. Set one or more properties of one or more atoms. Since atom properties are initially assigned by the read_data, read_restart or create_atoms commands, this command changes those assignments. This can be useful for overriding the default values assigned by the create_atoms command (e.g. charge = 0.0). It can be useful for altering pairwise and molecular force interactions,PROCESSORS COMMAND
The grid keyword affects the factorization of P into Px,Py,Pz and it can also affect how the P processor IDs are mapped to the 3d grid of processors.. The onelevel style creates a 3d grid that is compatible with the Px,Py,Pz settings, and which minimizes the surface-to-volume ratio of each processor’s sub-domain, as described above. The mapping of processors to the grid is determined by the COUPLE/CFD/FORCE COMMAND Description¶. The command couple/cfd/force can only be used in combination with fix_couple_cfd. This model transfers the force that the fluid exceeds on each particle to the DEM calculation. At every coupling time step the force term, which contains contributions from all force models active in the CFD calculation, is passed on toLIGGGHTS®.
RUN COMMAND
See this section of the documentation for ideas about how to couple LIGGGHTS (R)-PUBLIC to other codes. With the every option, N total steps are simulated, in shorter runs of M steps each. After each M-length run, the specified commands are invoked. If only a single command is specified as NULL, then no command is invoked. OPEN SOURCE LATTICE-BOLTZMANN AND LB-DEM COUPLING CFDEMproject goes Lattice-Boltzmann: We're following two main project lines: 1. LIGGGHTS-Palabos Coupling. In Greek language, παλαβός means "crazy". Crazy people do amazing stuff, so we decided to couple to their code: In the past, we already coupled Palabos to Open Source CFD - see here for an eye-candy. GRAN ROLLING_FRICTION EPSD MODEL Here k_r denotes the rolling stiffness that depends on the stiffness of the normal spring (from the normal contact law), the effective radius and the coefficient of rolling friction (mu_r). Following (Ai) the prefactor of 2.25 is valid for 3D simulations. The EPSD3 model allows to modify the prefactor. dtheta_r is the incremental relativePAIR_STYLE COMMAND
The pair style settings (including global cutoffs) can be changed by a subsequent pair_style command using the same style. This will reset the cutoffs for all atom type pairs, including those previously set explicitly by a pair_coeff command. The exceptions to this are thatpair_style
FIX PARTICLEDISTRIBUTION/DISCRETE COMMAND Description¶. Define a discrete particle distribution that defines a discrete particle distribution to be inserted by a fix insert/stream, fix insert/pack, fix insert/rate/region or a related command. It takes several templates of type fix_particletemplate_sphere as input, which define the properties of the single particles (such as radius, density that are part of the distribution. FIX HEAT/GRAN COMMAND ID, group-ID are documented in fix command. heat/gran/conduction or fix heat/gran = style name of this fix command. initial_temperature = obligatory keyword. T0 = initial (default) temperature for the particles. zero or more keyword/value pairs may be appended. keyword = contact_area or area_correction or store_contact_data. FIX WALL/GRAN COMMAND The keyword temperature is used to assign a constant temperature to the wall. This setting gets effective in conjunction with heat conduction via fix heat/gran/conduction.For wallstyle mesh, the value for the temperature given in this command is ignored and the temperature value is specified per mesh via fix mesh/surface.Contact area calculation can be controlled by keyword contact_area in the LIGGGHTS(R)-PUBLIC DOCUMENTATION, VERSION 3.X LIGGGHTS (R) Version info:¶ All LIGGGHTS (R) versions are based on a specific version of LIGGGHTS (R), as printed in the file src/version.h LIGGGHTS (R) versions are identidied by a version number (e.g. ‘3.0’), a branch name (which is ‘LIGGGHTS(R)-PUBLIC’ for your release of LIGGGHTS), compilation info (date / time stamp and user name), and a LAMMPS version number (which is the LAMMPS FIX PARTICLETEMPLATE/MULTISPHERE COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
CREATE_ATOMS COMMAND Description¶. This command creates atoms on a lattice, or a single atom, or a random collection of atoms, as an alternative to reading in their coordinates explicitly via a read_data or read_restart command. A simulation box must already exist, which is typically created via the create_box command. Before using this command, a lattice must also be defined using the lattice command. FORCEMODEL_GRADPFORCE COMMAND The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The gradPForce model is a model that calculates the particle based pressure gradient force - (grad (p)) * Vparticle (see Zhou et al. (2010): “Discrete particle simulation of particle-fluid flow: model formulations and their FIX PARTICLETEMPLATE/SUPERQUADRIC COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
COUPLE/CFD/FORCE COMMAND Description¶. The command couple/cfd/force can only be used in combination with fix_couple_cfd. This model transfers the force that the fluid exceeds on each particle to the DEM calculation. At every coupling time step the force term, which contains contributions from all force models active in the CFD calculation, is passed on toLIGGGHTS®.
LIGGGHTS® - USER FORUM 10. By mschramm 3 weeks 4 days ago. Normal topic. wall force. By hansmannb 7 years 5 months ago. 4. By Kashminder 3 weeks 4 days ago. Normal topic. Calculating Unbalanced force within LIGGGHTS script. FIX INSERT/PACK COMMAND Description for fix insert/pack: This command must use the region keyword to define an insertion volume. The specified region must have been previously defined with a region command. Dynamic regions are not supported as insertion region. Each timestep particles are inserted, they are placed randomly inside the insertion volume. FIX PARTICLEDISTRIBUTION/DISCRETE COMMAND Description¶. Define a discrete particle distribution that defines a discrete particle distribution to be inserted by a fix insert/stream, fix insert/pack, fix insert/rate/region or a related command. It takes several templates of type fix_particletemplate_sphere as input, which define the properties of the single particles (such as radius, density that are part of the distribution. FIX WALL/GRAN COMMAND The keyword temperature is used to assign a constant temperature to the wall. This setting gets effective in conjunction with heat conduction via fix heat/gran/conduction.For wallstyle mesh, the value for the temperature given in this command is ignored and the temperature value is specified per mesh via fix mesh/surface.Contact area calculation can be controlled by keyword contact_area in the LIGGGHTS(R)-PUBLIC DOCUMENTATION, VERSION 3.X LIGGGHTS (R) Version info:¶ All LIGGGHTS (R) versions are based on a specific version of LIGGGHTS (R), as printed in the file src/version.h LIGGGHTS (R) versions are identidied by a version number (e.g. ‘3.0’), a branch name (which is ‘LIGGGHTS(R)-PUBLIC’ for your release of LIGGGHTS), compilation info (date / time stamp and user name), and a LAMMPS version number (which is the LAMMPS FIX PARTICLETEMPLATE/MULTISPHERE COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
CREATE_ATOMS COMMAND Description¶. This command creates atoms on a lattice, or a single atom, or a random collection of atoms, as an alternative to reading in their coordinates explicitly via a read_data or read_restart command. A simulation box must already exist, which is typically created via the create_box command. Before using this command, a lattice must also be defined using the lattice command. FORCEMODEL_GRADPFORCE COMMAND The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The gradPForce model is a model that calculates the particle based pressure gradient force - (grad (p)) * Vparticle (see Zhou et al. (2010): “Discrete particle simulation of particle-fluid flow: model formulations and their FIX PARTICLETEMPLATE/SUPERQUADRIC COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
COUPLE/CFD/FORCE COMMAND Description¶. The command couple/cfd/force can only be used in combination with fix_couple_cfd. This model transfers the force that the fluid exceeds on each particle to the DEM calculation. At every coupling time step the force term, which contains contributions from all force models active in the CFD calculation, is passed on toLIGGGHTS®.
LIGGGHTS® - USER FORUM 10. By mschramm 3 weeks 4 days ago. Normal topic. wall force. By hansmannb 7 years 5 months ago. 4. By Kashminder 3 weeks 4 days ago. Normal topic. Calculating Unbalanced force within LIGGGHTS script. FIX INSERT/PACK COMMAND Description for fix insert/pack: This command must use the region keyword to define an insertion volume. The specified region must have been previously defined with a region command. Dynamic regions are not supported as insertion region. Each timestep particles are inserted, they are placed randomly inside the insertion volume. FIX PARTICLEDISTRIBUTION/DISCRETE COMMAND Description¶. Define a discrete particle distribution that defines a discrete particle distribution to be inserted by a fix insert/stream, fix insert/pack, fix insert/rate/region or a related command. It takes several templates of type fix_particletemplate_sphere as input, which define the properties of the single particles (such as radius, density that are part of the distribution. ABOUT CFDEM®PROJECT CFDEM®project is an open source software project for computational simulation engines, for these particle and fluid flow processes. - the CFDEM®coupling CFD-DEM software. Every contribution to the open source packages LIGGGHTS® and CFDEM®coupling in the past is mentioned in the release notes. Work from all across theCFDEM®project
SET COMMAND
Description¶. Set one or more properties of one or more atoms. Since atom properties are initially assigned by the read_data, read_restart or create_atoms commands, this command changes those assignments. This can be useful for overriding the default values assigned by the create_atoms command (e.g. charge = 0.0). It can be useful for altering pairwise and molecular force interactions,PROCESSORS COMMAND
The grid keyword affects the factorization of P into Px,Py,Pz and it can also affect how the P processor IDs are mapped to the 3d grid of processors.. The onelevel style creates a 3d grid that is compatible with the Px,Py,Pz settings, and which minimizes the surface-to-volume ratio of each processor’s sub-domain, as described above. The mapping of processors to the grid is determined by the COUPLE/CFD/FORCE COMMAND Description¶. The command couple/cfd/force can only be used in combination with fix_couple_cfd. This model transfers the force that the fluid exceeds on each particle to the DEM calculation. At every coupling time step the force term, which contains contributions from all force models active in the CFD calculation, is passed on toLIGGGHTS®.
RUN COMMAND
See this section of the documentation for ideas about how to couple LIGGGHTS (R)-PUBLIC to other codes. With the every option, N total steps are simulated, in shorter runs of M steps each. After each M-length run, the specified commands are invoked. If only a single command is specified as NULL, then no command is invoked. OPEN SOURCE LATTICE-BOLTZMANN AND LB-DEM COUPLING CFDEMproject goes Lattice-Boltzmann: We're following two main project lines: 1. LIGGGHTS-Palabos Coupling. In Greek language, παλαβός means "crazy". Crazy people do amazing stuff, so we decided to couple to their code: In the past, we already coupled Palabos to Open Source CFD - see here for an eye-candy. GRAN ROLLING_FRICTION EPSD MODEL Here k_r denotes the rolling stiffness that depends on the stiffness of the normal spring (from the normal contact law), the effective radius and the coefficient of rolling friction (mu_r). Following (Ai) the prefactor of 2.25 is valid for 3D simulations. The EPSD3 model allows to modify the prefactor. dtheta_r is the incremental relativePAIR_STYLE COMMAND
The pair style settings (including global cutoffs) can be changed by a subsequent pair_style command using the same style. This will reset the cutoffs for all atom type pairs, including those previously set explicitly by a pair_coeff command. The exceptions to this are thatpair_style
FIX HEAT/GRAN COMMAND ID, group-ID are documented in fix command. heat/gran/conduction or fix heat/gran = style name of this fix command. initial_temperature = obligatory keyword. T0 = initial (default) temperature for the particles. zero or more keyword/value pairs may be appended. keyword = contact_area or area_correction or store_contact_data. FIX PARTICLEDISTRIBUTION/DISCRETE COMMAND Description¶. Define a discrete particle distribution that defines a discrete particle distribution to be inserted by a fix insert/stream, fix insert/pack, fix insert/rate/region or a related command. It takes several templates of type fix_particletemplate_sphere as input, which define the properties of the single particles (such as radius, density that are part of the distribution. ABOUT CFDEM®PROJECT CFDEM®project is an open source software project for computational simulation engines, for these particle and fluid flow processes. - the CFDEM®coupling CFD-DEM software. Every contribution to the open source packages LIGGGHTS® and CFDEM®coupling in the past is mentioned in the release notes. Work from all across theCFDEM®project
DOWNLOAD & INSTALL
Dedicated to open source high performance scientific computing in fluid mechanics and particle science . A project by DCS Computing andCFDEMresearch
INSTALLATION
Open PhD position at Johannes Kepler University. DCS is looking for an Applications Engineer (immediate start) Aspherix®, the successor of LIGGGHTS®, has been launched! We are looking for an Early Stage Researcher/PhD student (starting 10/2019) CFDEM®coupling 3.8.0 released. LIGGGHTS® 3.8.0 released - superquadric shapes nowavailable in
RESOLVED CFD-DEM (IMMERSED BOUNDARY) The second flavor of CFD-DEM is "resolved" CFD-DEM, which resolves the flow around each particle. It uses an immersed boundary/fictitious domain method to represent the solids within the CFD domain. The examples below illustrate some of the capabilities and the applicability of CFDEM®coupling for unresolved CFD-DEM. FIX WALL/GRAN COMMAND The keyword temperature is used to assign a constant temperature to the wall. This setting gets effective in conjunction with heat conduction via fix heat/gran/conduction.For wallstyle mesh, the value for the temperature given in this command is ignored and the temperature value is specified per mesh via fix mesh/surface.Contact area calculation can be controlled by keyword contact_area in the LIGGGHTS(R)-PUBLIC DOCUMENTATION, VERSION 3.X LIGGGHTS (R) Version info:¶ All LIGGGHTS (R) versions are based on a specific version of LIGGGHTS (R), as printed in the file src/version.h LIGGGHTS (R) versions are identidied by a version number (e.g. ‘3.0’), a branch name (which is ‘LIGGGHTS(R)-PUBLIC’ for your release of LIGGGHTS), compilation info (date / time stamp and user name), and a LAMMPS version number (which is the LAMMPS LIGGGHTS® - USER FORUM 10. By mschramm 3 weeks 4 days ago. Normal topic. wall force. By hansmannb 7 years 5 months ago. 4. By Kashminder 3 weeks 4 days ago. Normal topic. Calculating Unbalanced force within LIGGGHTS script. FIX PARTICLETEMPLATE/MULTISPHERE COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
LIGGGHTS TUTORIAL
ERROR on proc 0: Random number generation: It is required that the random seed value is > 10000 and a prime number. The random seed used was 1. Hint 1: start with 'liggghts -echo both < in.script' to find out which command caused this. Hint 2: possible valid seeds would be FIX PARTICLETEMPLATE/SUPERQUADRIC COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
ABOUT CFDEM®PROJECT CFDEM®project is an open source software project for computational simulation engines, for these particle and fluid flow processes. - the CFDEM®coupling CFD-DEM software. Every contribution to the open source packages LIGGGHTS® and CFDEM®coupling in the past is mentioned in the release notes. Work from all across theCFDEM®project
DOWNLOAD & INSTALL
Dedicated to open source high performance scientific computing in fluid mechanics and particle science . A project by DCS Computing andCFDEMresearch
INSTALLATION
Open PhD position at Johannes Kepler University. DCS is looking for an Applications Engineer (immediate start) Aspherix®, the successor of LIGGGHTS®, has been launched! We are looking for an Early Stage Researcher/PhD student (starting 10/2019) CFDEM®coupling 3.8.0 released. LIGGGHTS® 3.8.0 released - superquadric shapes nowavailable in
RESOLVED CFD-DEM (IMMERSED BOUNDARY) The second flavor of CFD-DEM is "resolved" CFD-DEM, which resolves the flow around each particle. It uses an immersed boundary/fictitious domain method to represent the solids within the CFD domain. The examples below illustrate some of the capabilities and the applicability of CFDEM®coupling for unresolved CFD-DEM. FIX WALL/GRAN COMMAND The keyword temperature is used to assign a constant temperature to the wall. This setting gets effective in conjunction with heat conduction via fix heat/gran/conduction.For wallstyle mesh, the value for the temperature given in this command is ignored and the temperature value is specified per mesh via fix mesh/surface.Contact area calculation can be controlled by keyword contact_area in the LIGGGHTS(R)-PUBLIC DOCUMENTATION, VERSION 3.X LIGGGHTS (R) Version info:¶ All LIGGGHTS (R) versions are based on a specific version of LIGGGHTS (R), as printed in the file src/version.h LIGGGHTS (R) versions are identidied by a version number (e.g. ‘3.0’), a branch name (which is ‘LIGGGHTS(R)-PUBLIC’ for your release of LIGGGHTS), compilation info (date / time stamp and user name), and a LAMMPS version number (which is the LAMMPS LIGGGHTS® - USER FORUM 10. By mschramm 3 weeks 4 days ago. Normal topic. wall force. By hansmannb 7 years 5 months ago. 4. By Kashminder 3 weeks 4 days ago. Normal topic. Calculating Unbalanced force within LIGGGHTS script. FIX PARTICLETEMPLATE/MULTISPHERE COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
LIGGGHTS TUTORIAL
ERROR on proc 0: Random number generation: It is required that the random seed value is > 10000 and a prime number. The random seed used was 1. Hint 1: start with 'liggghts -echo both < in.script' to find out which command caused this. Hint 2: possible valid seeds would be FIX PARTICLETEMPLATE/SUPERQUADRIC COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
DOWNLOAD & INSTALL
Dedicated to open source high performance scientific computing in fluid mechanics and particle science . A project by DCS Computing andCFDEMresearch
TUTORIALS | CFDEM®PROJECT Dedicated to open source high performance scientific computing in fluid mechanics and particle science . A project by DCS Computing andCFDEMresearch
DOWNLOAD LIGGGHTS®-PUBLIC Download LIGGGHTS®-PUBLIC. On this this page, you find instructions how to download the current LIGGGHTS®-PUBLIC version including doc and examples. You have 2 options for getting LIGGGHTS®-PUBLIC: + Checking out via Git. + Checking out via Ubuntu/Debian packages (currently not supported) LIGGGHTS® - USER FORUM 10. By mschramm 3 weeks 4 days ago. Normal topic. wall force. By hansmannb 7 years 5 months ago. 4. By Kashminder 3 weeks 4 days ago. Normal topic. Calculating Unbalanced force within LIGGGHTS script. FIX INSERT/PACK COMMAND The initial velocity and rotational velocity can be controlled via the vel and omega keywords.vel constant simply patches a constant velocity to the inserted particles, vel uniform sets uniformly distributed velocities with mean and amplitude.vel gaussian sets Gaussian distributed particle velocities with mean and std. deviation.. The set_property option can be used to initialize scalar perPROCESSORS COMMAND
The grid keyword affects the factorization of P into Px,Py,Pz and it can also affect how the P processor IDs are mapped to the 3d grid of processors.. The onelevel style creates a 3d grid that is compatible with the Px,Py,Pz settings, and which minimizes the surface-to-volume ratio of each processor’s sub-domain, as described above. The mapping of processors to the grid is determined by theSET COMMAND
Description¶. Set one or more properties of one or more atoms. Since atom properties are initially assigned by the read_data, read_restart or create_atoms commands, this command changes those assignments. This can be useful for overriding the default values assigned by the create_atoms command (e.g. charge = 0.0). It can be useful for altering pairwise and molecular force interactions, CREATE_ATOMS COMMAND Description¶. This command creates atoms on a lattice, or a single atom, or a random collection of atoms, as an alternative to reading in their coordinates explicitly via a read_data or read_restart command. A simulation box must already exist, which is typically created via the create_box command. Before using this command, a lattice must also be defined using the lattice command. FORCEMODEL_GRADPFORCE COMMAND The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The gradPForce model is a model that calculates the particle based pressure gradient force - (grad (p)) * Vparticle (see Zhou et al. (2010): “Discrete particle simulation of particle-fluid flow: model formulations and their GRAN MODEL HERTZ MODEL Description¶. This granular model uses the following formula for the frictional force between two granular particles, when the distance r between two particles of radii Ri and Rj is less than their contact distance d = Ri + Rj. There is no force between the particles when r > d: In the first term is the normal force between the two particles FIX WALL/GRAN COMMAND The keyword temperature is used to assign a constant temperature to the wall. This setting gets effective in conjunction with heat conduction via fix heat/gran/conduction.For wallstyle mesh, the value for the temperature given in this command is ignored and the temperature value is specified per mesh via fix mesh/surface.Contact area calculation can be controlled by keyword contact_area in the LIGGGHTS(R)-PUBLIC DOCUMENTATION, VERSION 3.X LIGGGHTS (R) Version info:¶ All LIGGGHTS (R) versions are based on a specific version of LIGGGHTS (R), as printed in the file src/version.h LIGGGHTS (R) versions are identidied by a version number (e.g. ‘3.0’), a branch name (which is ‘LIGGGHTS(R)-PUBLIC’ for your release of LIGGGHTS), compilation info (date / time stamp and user name), and a LAMMPS version number (which is the LAMMPS COUPLE/CFD/FORCE COMMAND Description¶. The command couple/cfd/force can only be used in combination with fix_couple_cfd. This model transfers the force that the fluid exceeds on each particle to the DEM calculation. At every coupling time step the force term, which contains contributions from all force models active in the CFD calculation, is passed on toLIGGGHTS®.
CREATE_ATOMS COMMAND Description¶. This command creates atoms on a lattice, or a single atom, or a random collection of atoms, as an alternative to reading in their coordinates explicitly via a read_data or read_restart command. A simulation box must already exist, which is typically created via the create_box command. Before using this command, a lattice must also be defined using the lattice command. FIX PARTICLETEMPLATE/MULTISPHERE COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
LIGGGHTS® - USER FORUM 10. By mschramm 3 weeks 4 days ago. Normal topic. wall force. By hansmannb 7 years 5 months ago. 4. By Kashminder 3 weeks 4 days ago. Normal topic. Calculating Unbalanced force within LIGGGHTS script. FIX PARTICLETEMPLATE/SUPERQUADRIC COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
FORCEMODEL_GRADPFORCE COMMAND The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The gradPForce model is a model that calculates the particle based pressure gradient force - (grad (p)) * Vparticle (see Zhou et al. (2010): “Discrete particle simulation of particle-fluid flow: model formulations and their FIX INSERT/PACK COMMAND Description for fix insert/pack: This command must use the region keyword to define an insertion volume. The specified region must have been previously defined with a region command. Dynamic regions are not supported as insertion region. Each timestep particles are inserted, they are placed randomly inside the insertion volume. FIX PARTICLEDISTRIBUTION/DISCRETE COMMAND Description¶. Define a discrete particle distribution that defines a discrete particle distribution to be inserted by a fix insert/stream, fix insert/pack, fix insert/rate/region or a related command. It takes several templates of type fix_particletemplate_sphere as input, which define the properties of the single particles (such as radius, density that are part of the distribution. FIX WALL/GRAN COMMAND The keyword temperature is used to assign a constant temperature to the wall. This setting gets effective in conjunction with heat conduction via fix heat/gran/conduction.For wallstyle mesh, the value for the temperature given in this command is ignored and the temperature value is specified per mesh via fix mesh/surface.Contact area calculation can be controlled by keyword contact_area in the LIGGGHTS(R)-PUBLIC DOCUMENTATION, VERSION 3.X LIGGGHTS (R) Version info:¶ All LIGGGHTS (R) versions are based on a specific version of LIGGGHTS (R), as printed in the file src/version.h LIGGGHTS (R) versions are identidied by a version number (e.g. ‘3.0’), a branch name (which is ‘LIGGGHTS(R)-PUBLIC’ for your release of LIGGGHTS), compilation info (date / time stamp and user name), and a LAMMPS version number (which is the LAMMPS COUPLE/CFD/FORCE COMMAND Description¶. The command couple/cfd/force can only be used in combination with fix_couple_cfd. This model transfers the force that the fluid exceeds on each particle to the DEM calculation. At every coupling time step the force term, which contains contributions from all force models active in the CFD calculation, is passed on toLIGGGHTS®.
CREATE_ATOMS COMMAND Description¶. This command creates atoms on a lattice, or a single atom, or a random collection of atoms, as an alternative to reading in their coordinates explicitly via a read_data or read_restart command. A simulation box must already exist, which is typically created via the create_box command. Before using this command, a lattice must also be defined using the lattice command. FIX PARTICLETEMPLATE/MULTISPHERE COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
LIGGGHTS® - USER FORUM 10. By mschramm 3 weeks 4 days ago. Normal topic. wall force. By hansmannb 7 years 5 months ago. 4. By Kashminder 3 weeks 4 days ago. Normal topic. Calculating Unbalanced force within LIGGGHTS script. FIX PARTICLETEMPLATE/SUPERQUADRIC COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
FORCEMODEL_GRADPFORCE COMMAND The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The gradPForce model is a model that calculates the particle based pressure gradient force - (grad (p)) * Vparticle (see Zhou et al. (2010): “Discrete particle simulation of particle-fluid flow: model formulations and their FIX INSERT/PACK COMMAND Description for fix insert/pack: This command must use the region keyword to define an insertion volume. The specified region must have been previously defined with a region command. Dynamic regions are not supported as insertion region. Each timestep particles are inserted, they are placed randomly inside the insertion volume. FIX PARTICLEDISTRIBUTION/DISCRETE COMMAND Description¶. Define a discrete particle distribution that defines a discrete particle distribution to be inserted by a fix insert/stream, fix insert/pack, fix insert/rate/region or a related command. It takes several templates of type fix_particletemplate_sphere as input, which define the properties of the single particles (such as radius, density that are part of the distribution. RESOLVED CFD-DEM (IMMERSED BOUNDARY) The second flavor of CFD-DEM is "resolved" CFD-DEM, which resolves the flow around each particle. It uses an immersed boundary/fictitious domain method to represent the solids within the CFD domain. The examples below illustrate some of the capabilities and the applicability of CFDEM®coupling for unresolved CFD-DEM.SET COMMAND
Description¶. Set one or more properties of one or more atoms. Since atom properties are initially assigned by the read_data, read_restart or create_atoms commands, this command changes those assignments. This can be useful for overriding the default values assigned by the create_atoms command (e.g. charge = 0.0). It can be useful for altering pairwise and molecular force interactions,RUN COMMAND
See this section of the documentation for ideas about how to couple LIGGGHTS (R)-PUBLIC to other codes. With the every option, N total steps are simulated, in shorter runs of M steps each. After each M-length run, the specified commands are invoked. If only a single command is specified as NULL, then no command is invoked. COUPLE/CFD/FORCE COMMAND Description¶. The command couple/cfd/force can only be used in combination with fix_couple_cfd. This model transfers the force that the fluid exceeds on each particle to the DEM calculation. At every coupling time step the force term, which contains contributions from all force models active in the CFD calculation, is passed on toLIGGGHTS®.
PROCESSORS COMMAND
The grid keyword affects the factorization of P into Px,Py,Pz and it can also affect how the P processor IDs are mapped to the 3d grid of processors.. The onelevel style creates a 3d grid that is compatible with the Px,Py,Pz settings, and which minimizes the surface-to-volume ratio of each processor’s sub-domain, as described above. The mapping of processors to the grid is determined by the GRAN ROLLING_FRICTION EPSD MODEL Here k_r denotes the rolling stiffness that depends on the stiffness of the normal spring (from the normal contact law), the effective radius and the coefficient of rolling friction (mu_r). Following (Ai) the prefactor of 2.25 is valid for 3D simulations. The EPSD3 model allows to modify the prefactor. dtheta_r is the incremental relativePAIR_STYLE COMMAND
The pair style settings (including global cutoffs) can be changed by a subsequent pair_style command using the same style. This will reset the cutoffs for all atom type pairs, including those previously set explicitly by a pair_coeff command. The exceptions to this are thatpair_style
FIX HEAT/GRAN COMMAND ID, group-ID are documented in fix command. heat/gran/conduction or fix heat/gran = style name of this fix command. initial_temperature = obligatory keyword. T0 = initial (default) temperature for the particles. zero or more keyword/value pairs may be appended. keyword = contact_area or area_correction or store_contact_data. FIX PARTICLEDISTRIBUTION/DISCRETE COMMAND Description¶. Define a discrete particle distribution that defines a discrete particle distribution to be inserted by a fix insert/stream, fix insert/pack, fix insert/rate/region or a related command. It takes several templates of type fix_particletemplate_sphere as input, which define the properties of the single particles (such as radius, density that are part of the distribution. RUN LIGGGHTS ON WINDOWS 10 PC At that time I used a virtual machine and installed Ubuntu to run a LIGGGHTS simulation. I read in the documentation the following: On a Windows box, you can skip making LIGGGHTS (R)-PUBLIC and simply download an executable, as described above, though the pre-packaged executables include only certain packages. FIX INSERT/PACK COMMAND The initial velocity and rotational velocity can be controlled via the vel and omega keywords.vel constant simply patches a constant velocity to the inserted particles, vel uniform sets uniformly distributed velocities with mean and amplitude.vel gaussian sets Gaussian distributed particle velocities with mean and std. deviation.. The set_property option can be used to initialize scalar per FIX WALL/GRAN COMMAND The keyword temperature is used to assign a constant temperature to the wall. This setting gets effective in conjunction with heat conduction via fix heat/gran/conduction.For wallstyle mesh, the value for the temperature given in this command is ignored and the temperature value is specified per mesh via fix mesh/surface.Contact area calculation can be controlled by keyword contact_area in the LIGGGHTS(R)-PUBLIC DOCUMENTATION, VERSION 3.X LIGGGHTS (R) Version info:¶ All LIGGGHTS (R) versions are based on a specific version of LIGGGHTS (R), as printed in the file src/version.h LIGGGHTS (R) versions are identidied by a version number (e.g. ‘3.0’), a branch name (which is ‘LIGGGHTS(R)-PUBLIC’ for your release of LIGGGHTS), compilation info (date / time stamp and user name), and a LAMMPS version number (which is the LAMMPS FIX PARTICLETEMPLATE/SUPERQUADRIC COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
COUPLE/CFD/FORCE COMMAND Description¶. The command couple/cfd/force can only be used in combination with fix_couple_cfd.This model transfers the force that the fluid exceeds on each particle to the DEM calculation. CREATE_ATOMS COMMAND Description¶. This command creates atoms on a lattice, or a single atom, or a random collection of atoms, as an alternative to reading in their coordinates explicitly via a read_data or read_restart command. A simulation box must already exist, which is typically created via the create_box command. Before using this command, a lattice must also be defined using the lattice command. FORCEMODEL_GRADPFORCE COMMAND Description¶. The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The gradPForce model is a model that calculates the particle based pressure gradient force -(grad(p)) * Vparticle (see Zhou et al. (2010): “Discrete particle simulation of particle-fluid flow: model formulations and their applicability” ,JFM). LIGGGHTS® - USER FORUM This website uses cookies to ensure you get the best experience on our website. By continuing to browse the site you are agreeing to our useof cookies.
FIX CHECK/TIMESTEP/GRAN COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. No information about this fix is written to binary restart files.None of the fix_modify options are relevant to this fix. This fix computes a 3-vector, for access by various output commands.The vector consists of the time-step size expressed as fraction of the Rayleigh and Hertz time-step sizes and the ratio of skin to the distance FIX HEAT/GRAN COMMAND To set the temperature for a group of particles, you can use the set command with keyword property/atom and values Temp T.T is the temperature value you want the particles to have. To set heat sources (or sinks) for a group of particles, you can also use the set command with the set keyword: property/atom and the set values: heatSource h where h is the heat source value you want the particles FIX INSERT/PACK COMMAND The initial velocity and rotational velocity can be controlled via the vel and omega keywords.vel constant simply patches a constant velocity to the inserted particles, vel uniform sets uniformly distributed velocities with mean and amplitude.vel gaussian sets Gaussian distributed particle velocities with mean and std. deviation.. The set_property option can be used to initialize scalar per FIX WALL/GRAN COMMAND The keyword temperature is used to assign a constant temperature to the wall. This setting gets effective in conjunction with heat conduction via fix heat/gran/conduction.For wallstyle mesh, the value for the temperature given in this command is ignored and the temperature value is specified per mesh via fix mesh/surface.Contact area calculation can be controlled by keyword contact_area in the LIGGGHTS(R)-PUBLIC DOCUMENTATION, VERSION 3.X LIGGGHTS (R) Version info:¶ All LIGGGHTS (R) versions are based on a specific version of LIGGGHTS (R), as printed in the file src/version.h LIGGGHTS (R) versions are identidied by a version number (e.g. ‘3.0’), a branch name (which is ‘LIGGGHTS(R)-PUBLIC’ for your release of LIGGGHTS), compilation info (date / time stamp and user name), and a LAMMPS version number (which is the LAMMPS FIX PARTICLETEMPLATE/SUPERQUADRIC COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
COUPLE/CFD/FORCE COMMAND Description¶. The command couple/cfd/force can only be used in combination with fix_couple_cfd.This model transfers the force that the fluid exceeds on each particle to the DEM calculation. CREATE_ATOMS COMMAND Description¶. This command creates atoms on a lattice, or a single atom, or a random collection of atoms, as an alternative to reading in their coordinates explicitly via a read_data or read_restart command. A simulation box must already exist, which is typically created via the create_box command. Before using this command, a lattice must also be defined using the lattice command. FORCEMODEL_GRADPFORCE COMMAND Description¶. The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The gradPForce model is a model that calculates the particle based pressure gradient force -(grad(p)) * Vparticle (see Zhou et al. (2010): “Discrete particle simulation of particle-fluid flow: model formulations and their applicability” ,JFM). LIGGGHTS® - USER FORUM This website uses cookies to ensure you get the best experience on our website. By continuing to browse the site you are agreeing to our useof cookies.
FIX CHECK/TIMESTEP/GRAN COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. No information about this fix is written to binary restart files.None of the fix_modify options are relevant to this fix. This fix computes a 3-vector, for access by various output commands.The vector consists of the time-step size expressed as fraction of the Rayleigh and Hertz time-step sizes and the ratio of skin to the distance FIX HEAT/GRAN COMMAND To set the temperature for a group of particles, you can use the set command with keyword property/atom and values Temp T.T is the temperature value you want the particles to have. To set heat sources (or sinks) for a group of particles, you can also use the set command with the set keyword: property/atom and the set values: heatSource h where h is the heat source value you want the particles ABOUT CFDEM®PROJECT Dedicated to open source and commerical high performance scientific computing in fluid mechanics and particle science. Particles and flow processes are everywhere - in industry, environment and everyday life Sugar, sand, ores, tablets, chemicals, biomass, detergents, plastics, crops, fruits need to be harvested, produced, processed, transportedand stored.
RUN COMMAND
If post is specified as “no”, the full timing summary is skipped; only a one-line summary timing is printed.. The every keyword provides a means of breaking a LIGGGHTS(R)-PUBLIC run into a series of shorter runs. Optionally, one or more LIGGGHTS(R)-PUBLIC commands (c1, c2, , cN) will be executed in between the short runs. If used, the every keyword must be the last keyword, since it hasSET COMMAND
Description¶. Set one or more properties of one or more atoms. Since atom properties are initially assigned by the read_data, read_restart or create_atoms commands, this command changes those assignments. This can be useful for overriding the default values assigned by the create_atoms command (e.g. charge = 0.0). It can be useful for altering pairwise and molecular force interactions,4. COMMANDS
4.1. List of all commands ¶. This section lists all LIGGGHTS commands alphabetically, with a separate listing below of styles within certaincommands.
FIX INSERT/PACK COMMAND The initial velocity and rotational velocity can be controlled via the vel and omega keywords.vel constant simply patches a constant velocity to the inserted particles, vel uniform sets uniformly distributed velocities with mean and amplitude.vel gaussian sets Gaussian distributed particle velocities with mean and std. deviation.. The set_property option can be used to initialize scalar per FIX HEAT/GRAN COMMAND To set the temperature for a group of particles, you can use the set command with keyword property/atom and values Temp T.T is the temperature value you want the particles to have. To set heat sources (or sinks) for a group of particles, you can also use the set command with the set keyword: property/atom and the set values: heatSource h where h is the heat source value you want the particles FIX PARTICLETEMPLATE/MULTISPHERE COMMAND Restart, fix_modify, output, run start/stop, minimize info¶. Information about the random state in this fix is written to binary restart files so you can restart a simulation with the same particles being chosen for insertion. None of the fix_modify options are relevant to this fix. No global scalar or vector or per-atom quantities are stored by this fix for access by various outputcommands.
7. PACKAGES
The “Doc page” column links to either a portion of the Section_howto of the manual, or an input script command implemented as part of the package. The “Example” column is a sub-directory in the examples directory of the distribution which has an input script that uses the package.DUMP COMMAND
Description¶. Dump a snapshot of atom quantities to one or more files every N timesteps in one of several styles. The image style is the exception; it creates a JPG or PPM image file of the atom configuration every N timesteps, as discussed on the dump image doc page. The timesteps on which dump output is written can also be controlled by a variable; see the dump_modify every command for HOW CAN I CHANGE THE DENSITY OF FLUID PHASE IN Hello Hwang, like in pressure based OpenFOAM solvers the density is not used as an explicit quantity, i.e. the pressure in the p-file is actually pressure/density and the viscosity is chosen accordingly in the transportProperties file. Skip to main contentCFDEM®PROJECT
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