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ChengshunShang1996ChengshunShang1996
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Merge pull request #145 from KratosMultiphysics/add-dem-examples
[DEM] Added a DEM example
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‎dem/use_cases/a_simple_3D_DEM_case/MainKratos.py

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import time
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import sys
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import KratosMultiphysics
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from KratosMultiphysics.DEMApplication.DEM_analysis_stage import DEMAnalysisStage
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from KratosMultiphysics import *
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from KratosMultiphysics.DEMApplication import *
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from KratosMultiphysics import Logger
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class DEMAnalysisStageWithFlush(DEMAnalysisStage):
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def __init__(self, model, project_parameters, flush_frequency=10.0):
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super().__init__(model, project_parameters)
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self.flush_frequency = flush_frequency
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self.last_flush = time.time()
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def FinalizeSolutionStep(self):
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super().FinalizeSolutionStep()
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if self.parallel_type == "OpenMP":
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now = time.time()
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if now - self.last_flush > self.flush_frequency:
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sys.stdout.flush()
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self.last_flush = now
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if __name__ == "__main__":
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Logger.GetDefaultOutput().SetSeverity(Logger.Severity.INFO)
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with open("ProjectParametersDEM.json", 'r') as parameter_file:
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parameters = KratosMultiphysics.Parameters(parameter_file.read())
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global_model = KratosMultiphysics.Model()
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DEMAnalysisStageWithFlush(global_model, parameters).Run()

‎dem/use_cases/a_simple_3D_DEM_case/MaterialsDEM.json

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{
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"materials" : [{
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"material_name" : "DEM-P",
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"material_id" : 1,
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"Variables" : {
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"PARTICLE_DENSITY" : 2200,
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"YOUNG_MODULUS" : 9.0e9,
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"POISSON_RATIO" : 0.25,
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"PARTICLE_SPHERICITY" : 1.0
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}
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},{
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"material_name" : "DEM-S",
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"material_id" : 2,
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"Variables" : {
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"YOUNG_MODULUS" : 202e9,
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"POISSON_RATIO" : 0.25,
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"PARTICLE_SPHERICITY" : 1.0,
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"COMPUTE_WEAR" : false
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}
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}],
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"material_relations" : [{
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"material_names_list" : ["DEM-P","DEM-P"],
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"material_ids_list" : [1,1],
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"Variables" : {
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"PARTICLE_MATERIAL": 1,
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"DEM_DISCONTINUUM_CONSTITUTIVE_LAW_NAME" : "DEM_D_Linear_viscous_Coulomb",
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"STATIC_FRICTION" : 0.25,
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"DYNAMIC_FRICTION" : 0.24,
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"FRICTION_DECAY" : 500,
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"COEFFICIENT_OF_RESTITUTION" : 0.189,
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"K_ALPHA" : 45.0,
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"DEM_ROLLING_FRICTION_MODEL_NAME" : "DEMRollingFrictionModelConstantTorque",
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"ROLLING_FRICTION" : 0.01,
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"ROLLING_FRICTION_WITH_WALLS" : 0.01
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}
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},{
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"material_names_list" : ["DEM-P","DEM-S"],
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"material_ids_list" : [1,2],
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"Variables" : {
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"PARTICLE_MATERIAL": 1,
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"DEM_DISCONTINUUM_CONSTITUTIVE_LAW_NAME": "DEM_D_Linear_viscous_Coulomb",
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"STATIC_FRICTION": 0.5,
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"DYNAMIC_FRICTION": 0.49,
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"FRICTION_DECAY": 500,
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"WALL_COHESION": 0.0,
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"SEVERITY_OF_WEAR": 0.001,
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"IMPACT_WEAR_SEVERITY": 0.001,
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"BRINELL_HARDNESS": 200.0,
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"COEFFICIENT_OF_RESTITUTION": 0.189,
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"K_ALPHA": 45.0,
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"DEM_ROLLING_FRICTION_MODEL_NAME" : "DEMRollingFrictionModelConstantTorque",
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"ROLLING_FRICTION": 0.01,
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"ROLLING_FRICTION_WITH_WALLS": 0.0
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}
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}],
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"material_assignation_table" : [["SpheresPart.DEMParts_Body","DEM-P"],
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["RigidFacePart.DEM-FEM-Wall_TOP","DEM-S"],
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["RigidFacePart.DEM-FEM-Wall_BOTTOM","DEM-S"]]
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}

‎dem/use_cases/a_simple_3D_DEM_case/ProjectParametersDEM.json

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{
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"Dimension" : 3,
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"PeriodicDomainOption" : false,
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"BoundingBoxOption" : false,
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"AutomaticBoundingBoxOption" : false,
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"BoundingBoxEnlargementFactor" : 1.1,
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"BoundingBoxStartTime" : 0.0,
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"BoundingBoxStopTime" : 1000.0,
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"BoundingBoxMaxX" : 10,
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"BoundingBoxMaxY" : 10,
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"BoundingBoxMaxZ" : 10,
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"BoundingBoxMinX" : -10,
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"BoundingBoxMinY" : -10,
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"BoundingBoxMinZ" : -10,
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"dem_inlet_option" : false,
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"GravityX" : 0.0,
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"GravityY" : 0.0,
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"GravityZ" : 0.0,
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"RotationOption" : true,
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"CleanIndentationsOption" : false,
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"VirtualMassCoefficient" : 1.0,
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"RollingFrictionOption" : false,
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"GlobalDamping" : 0.0,
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"ContactMeshOption" : true,
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"OutputFileType" : "Binary",
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"Multifile" : "multiple_files",
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"ElementType" : "SphericContPartDEMElement3D",
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"TranslationalIntegrationScheme" : "Symplectic_Euler",
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"RotationalIntegrationScheme" : "Direct_Integration",
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"MaxTimeStep" : 1e-5,
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"FinalTime" : 0.1,
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"NeighbourSearchFrequency" : 1,
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"SearchTolerance" : 0.02,
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"GraphExportFreq" : 1e-2,
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"VelTrapGraphExportFreq" : 1e-2,
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"OutputTimeStep" : 1e-2,
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"PostBoundingBox" : true,
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"PostLocalContactForce" : true,
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"PostDisplacement" : true,
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"PostRadius" : true,
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"PostVelocity" : true,
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"PostAngularVelocity" : true,
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"PostElasticForces" : true,
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"PostContactForces" : true,
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"PostRigidElementForces" : false,
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"PostStressStrainOption" : true,
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"PostTangentialElasticForces" : false,
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"PostTotalForces" : true,
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"PostPressure" : false,
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"PostShearStress" : false,
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"PostSkinSphere" : true,
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"PostNonDimensionalVolumeWear" : false,
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"PostParticleMoment" : true,
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"PostEulerAngles" : false,
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"PostRollingResistanceMoment" : false,
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"problem_name" : "test_PBM",
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"DeltaOption" : "Absolute",
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"CoordinationNumber" : 10,
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"AmplifiedSearchRadiusExtension" : 1.1,
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"PoissonEffectOption" : false,
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"ShearStrainParallelToBondOption" : false,
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"ComputeStressTensorOption" : false,
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"MaxAmplificationRatioOfSearchRadius" : 1000,
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"PostContactFailureId" : true,
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"EnergyCalculationOption" : false,
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"VelocityTrapOption" : false,
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"solver_settings" : {
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"RemoveBallsInitiallyTouchingWalls" : false,
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"strategy" : "sphere_strategy"
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},
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"ModelDataInfo" : false,
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"DontSearchUntilFailure" : false,
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"MaxNumberOfIntactBondsToConsiderASphereBroken" : 0,
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"AutomaticTimestep" : false,
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"DeltaTimeSafetyFactor" : 1.0,
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"ControlTime" : 4.0,
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"PostPoissonRatio" : false,
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"PostCharacteristicLength" : false,
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"PostNodalArea" : false,
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"PostContactSigma" : true,
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"PostContactTau" : true,
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"PostFailureCriterionState" : true,
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"PostMeanContactArea" : false,
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"PostRHS" : false,
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"PostDampForces" : false,
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"PostAppliedForces" : true,
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"PostGroupId" : false,
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"PostExportId" : false,
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"post_vtk_option" : false
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}
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‎dem/use_cases/a_simple_3D_DEM_case/test_PBMDEM.mdpa

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Begin ModelPartData
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// VARIABLE_NAME value
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End ModelPartData
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Begin Properties 0
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End Properties
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Begin Nodes
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1 -0.1 0.0 0.1
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2 0.1 0.0 0.1
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3 -0.1 0.0 -0.1
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4 0.1 0.0 -0.1
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5 0.0 0.141421356237 0.0
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6 0.0 -0.141421356237 0.0
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End Nodes
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Begin Elements SphericParticle3D// GUI group identifier: Body
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1 0 1
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2 0 2
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3 0 3
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4 0 4
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5 0 5
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6 0 6
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End Elements
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Begin NodalData RADIUS // GUI group identifier: Body
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1 0 0.1
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2 0 0.1
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3 0 0.1
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4 0 0.1
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5 0 0.1
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6 0 0.1
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End NodalData
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Begin SubModelPart DEMParts_Body // Group Body // Subtree DEMParts
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Begin SubModelPartNodes
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1
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2
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3
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4
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5
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6
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End SubModelPartNodes
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Begin SubModelPartElements
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1
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2
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3
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4
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5
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6
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End SubModelPartElements
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Begin SubModelPartConditions
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End SubModelPartConditions
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End SubModelPart

‎dem/use_cases/a_simple_3D_DEM_case/test_PBMDEM_FEM_boundary.mdpa

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Begin ModelPartData
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// VARIABLE_NAME value
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End ModelPartData
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Begin Properties 0
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End Properties
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Begin Nodes
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1 -0.2 0.241421356237 0.2
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2 -0.2 0.241421356237 -0.2
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3 0.2 0.241421356237 -0.2
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4 0.2 0.241421356237 0.2
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5 -0.2 -0.241421356237 0.2
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6 -0.2 -0.241421356237 -0.2
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7 0.2 -0.241421356237 -0.2
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8 0.2 -0.241421356237 0.2
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End Nodes
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Begin Conditions RigidFace3D4N// GUI group identifier: TOP
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1001 0 1 2 3 4
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End Conditions
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Begin Conditions RigidFace3D4N// GUI group identifier: BOTTOM
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2001 0 5 6 7 8
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End Conditions
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Begin SubModelPart DEM-FEM-Wall_TOP // DEM-FEM-Wall - group identifier: TOP
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Begin SubModelPartData // DEM-FEM-Wall. Group name: TOP
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LINEAR_VELOCITY [3] (-0.0, -0.05, -0.0)
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VELOCITY_PERIOD 0.0
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ANGULAR_VELOCITY [3] (0.0,0.0,0.0)
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ROTATION_CENTER [3] (0.0,0.0,0.0)
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ANGULAR_VELOCITY_PERIOD 0.0
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VELOCITY_START_TIME 0.0
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VELOCITY_STOP_TIME 100.0
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ANGULAR_VELOCITY_START_TIME 0.0
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ANGULAR_VELOCITY_STOP_TIME 100.0
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FIXED_MESH_OPTION 0
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RIGID_BODY_MOTION 1
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FREE_BODY_MOTION 0
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IS_GHOST 0
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IDENTIFIER TOP
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FORCE_INTEGRATION_GROUP 0
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End SubModelPartData
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Begin SubModelPartNodes
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1
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2
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3
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4
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End SubModelPartNodes
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Begin SubModelPartConditions
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1001
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End SubModelPartConditions
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End SubModelPart
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Begin SubModelPart DEM-FEM-Wall_BOTTOM // DEM-FEM-Wall - group identifier: BOTTOM
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Begin SubModelPartData // DEM-FEM-Wall. Group name: BOTTOM
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LINEAR_VELOCITY [3] (0.0, 0.05, 0.0)
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VELOCITY_PERIOD 0.0
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ANGULAR_VELOCITY [3] (0.0,0.0,0.0)
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ROTATION_CENTER [3] (0.0,0.0,0.0)
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ANGULAR_VELOCITY_PERIOD 0.0
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VELOCITY_START_TIME 0.0
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VELOCITY_STOP_TIME 100.0
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ANGULAR_VELOCITY_START_TIME 0.0
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ANGULAR_VELOCITY_STOP_TIME 100.0
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FIXED_MESH_OPTION 0
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RIGID_BODY_MOTION 1
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FREE_BODY_MOTION 0
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IS_GHOST 0
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IDENTIFIER BOTTOM
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FORCE_INTEGRATION_GROUP 0
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End SubModelPartData
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Begin SubModelPartNodes
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5
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6
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7
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8
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End SubModelPartNodes
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Begin SubModelPartConditions
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2001
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End SubModelPartConditions
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End SubModelPart
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