added a DEM example

dem/use_cases/a_simple_3D_DEM_case/MainKratos.py

@@ -0,0 +1,32 @@
+import time
+import sys
+
+import KratosMultiphysics
+from KratosMultiphysics.DEMApplication.DEM_analysis_stage import DEMAnalysisStage
+from KratosMultiphysics import *
+from KratosMultiphysics.DEMApplication import *
+from KratosMultiphysics import Logger
+
+class DEMAnalysisStageWithFlush(DEMAnalysisStage):
+
+    def __init__(self, model, project_parameters, flush_frequency=10.0):
+        super().__init__(model, project_parameters)
+        self.flush_frequency = flush_frequency
+        self.last_flush = time.time()
+
+    def FinalizeSolutionStep(self):
+        super().FinalizeSolutionStep()
+
+        if self.parallel_type == "OpenMP":
+            now = time.time()
+            if now - self.last_flush > self.flush_frequency:
+                sys.stdout.flush()
+                self.last_flush = now
+
+if __name__ == "__main__":
+    Logger.GetDefaultOutput().SetSeverity(Logger.Severity.INFO)
+    with open("ProjectParametersDEM.json", 'r') as parameter_file:
+        parameters = KratosMultiphysics.Parameters(parameter_file.read())
+
+    global_model = KratosMultiphysics.Model()
+    DEMAnalysisStageWithFlush(global_model, parameters).Run()

dem/use_cases/a_simple_3D_DEM_case/MaterialsDEM.json

@@ -0,0 +1,60 @@
+{
+    "materials"                  : [{
+        "material_name" : "DEM-P",
+        "material_id"   : 1,
+        "Variables"     : {
+            "PARTICLE_DENSITY"    : 2200,
+            "YOUNG_MODULUS"       : 9.0e9,
+            "POISSON_RATIO"       : 0.25,
+            "PARTICLE_SPHERICITY" : 1.0
+        }
+    },{
+        "material_name" : "DEM-S",
+        "material_id"   : 2,
+        "Variables"     : {
+            "YOUNG_MODULUS"       : 202e9,
+            "POISSON_RATIO"       : 0.25,
+            "PARTICLE_SPHERICITY" : 1.0,
+            "COMPUTE_WEAR"        : false
+        }
+    }],
+    "material_relations"         : [{
+        "material_names_list" : ["DEM-P","DEM-P"],
+        "material_ids_list"   : [1,1],
+        "Variables"           : {
+            "PARTICLE_MATERIAL": 1,
+            "DEM_DISCONTINUUM_CONSTITUTIVE_LAW_NAME" : "DEM_D_Linear_viscous_Coulomb",
+            "STATIC_FRICTION"                        : 0.25,
+            "DYNAMIC_FRICTION"                       : 0.24,
+            "FRICTION_DECAY"                         : 500,
+            "COEFFICIENT_OF_RESTITUTION"             : 0.189,
+            "K_ALPHA"                                : 45.0,
+            "DEM_ROLLING_FRICTION_MODEL_NAME"        : "DEMRollingFrictionModelConstantTorque",
+            "ROLLING_FRICTION"                       : 0.01,
+            "ROLLING_FRICTION_WITH_WALLS"            : 0.01
+
+        }
+    },{
+        "material_names_list" : ["DEM-P","DEM-S"],
+        "material_ids_list"   : [1,2],
+        "Variables"           : {
+            "PARTICLE_MATERIAL": 1,
+            "DEM_DISCONTINUUM_CONSTITUTIVE_LAW_NAME": "DEM_D_Linear_viscous_Coulomb",
+            "STATIC_FRICTION": 0.5,
+            "DYNAMIC_FRICTION": 0.49,
+            "FRICTION_DECAY": 500,
+            "WALL_COHESION": 0.0,
+            "SEVERITY_OF_WEAR": 0.001,
+            "IMPACT_WEAR_SEVERITY": 0.001,
+            "BRINELL_HARDNESS": 200.0,
+            "COEFFICIENT_OF_RESTITUTION": 0.189,
+            "K_ALPHA": 45.0,
+            "DEM_ROLLING_FRICTION_MODEL_NAME"       : "DEMRollingFrictionModelConstantTorque",
+            "ROLLING_FRICTION": 0.01,
+            "ROLLING_FRICTION_WITH_WALLS": 0.0
+        }
+    }],
+    "material_assignation_table" : [["SpheresPart.DEMParts_Body","DEM-P"],
+    ["RigidFacePart.DEM-FEM-Wall_TOP","DEM-S"],
+    ["RigidFacePart.DEM-FEM-Wall_BOTTOM","DEM-S"]]
+}

dem/use_cases/a_simple_3D_DEM_case/ProjectParametersDEM.json

@@ -0,0 +1,92 @@
+{
+    "Dimension"                           : 3,
+    "PeriodicDomainOption"                : false,
+    "BoundingBoxOption"                   : false,
+    "AutomaticBoundingBoxOption"          : false,
+    "BoundingBoxEnlargementFactor"        : 1.1,
+    "BoundingBoxStartTime"                : 0.0,
+    "BoundingBoxStopTime"                 : 1000.0,
+    "BoundingBoxMaxX"                     : 10,
+    "BoundingBoxMaxY"                     : 10,
+    "BoundingBoxMaxZ"                     : 10,
+    "BoundingBoxMinX"                     : -10,
+    "BoundingBoxMinY"                     : -10,
+    "BoundingBoxMinZ"                     : -10,
+    "dem_inlet_option"                    : false,
+    "GravityX"                            : 0.0,
+    "GravityY"                            : 0.0,
+    "GravityZ"                            : 0.0,
+    "RotationOption"                      : true,
+    "CleanIndentationsOption"             : false,
+    "VirtualMassCoefficient"              : 1.0,
+    "RollingFrictionOption"               : false,
+    "GlobalDamping"                       : 0.0,
+    "ContactMeshOption"                   : true,
+    "OutputFileType"                      : "Binary",
+    "Multifile"                           : "multiple_files",
+    "ElementType"                         : "SphericContPartDEMElement3D",
+    "TranslationalIntegrationScheme"      : "Symplectic_Euler",
+    "RotationalIntegrationScheme"         : "Direct_Integration",
+    "MaxTimeStep"                         : 1e-5,
+    "FinalTime"                           : 0.1,
+    "NeighbourSearchFrequency"            : 1,
+    "SearchTolerance"                     : 0.02,
+    "GraphExportFreq"                     : 1e-2,
+    "VelTrapGraphExportFreq"              : 1e-2,
+    "OutputTimeStep"                      : 1e-2,
+    "PostBoundingBox"                     : true,
+    "PostLocalContactForce"               : true,
+    "PostDisplacement"                    : true,
+    "PostRadius"                          : true,
+    "PostVelocity"                        : true,
+    "PostAngularVelocity"                 : true,
+    "PostElasticForces"                   : true,
+    "PostContactForces"                   : true,
+    "PostRigidElementForces"              : false,
+    "PostStressStrainOption"              : true,
+    "PostTangentialElasticForces"         : false,
+    "PostTotalForces"                     : true,
+    "PostPressure"                        : false,
+    "PostShearStress"                     : false,
+    "PostSkinSphere"                      : true,
+    "PostNonDimensionalVolumeWear"        : false,
+    "PostParticleMoment"                  : true,
+    "PostEulerAngles"                     : false,
+    "PostRollingResistanceMoment"         : false,
+    "problem_name"                        : "test_PBM",
+    "DeltaOption"                         : "Absolute",
+    "CoordinationNumber"                  : 10,
+    "AmplifiedSearchRadiusExtension"      : 1.1,
+    "PoissonEffectOption"                 : false,
+    "ShearStrainParallelToBondOption"     : false,
+    "ComputeStressTensorOption"           : false,
+    "MaxAmplificationRatioOfSearchRadius" : 1000,
+    "PostContactFailureId"                : true,
+
+    "EnergyCalculationOption"          : false,
+    "VelocityTrapOption"               : false,
+    "solver_settings"                     : {
+        "RemoveBallsInitiallyTouchingWalls" : false,
+        "strategy"                          : "sphere_strategy"
+    },
+    "ModelDataInfo"                    : false,
+    "DontSearchUntilFailure"           : false,
+    "MaxNumberOfIntactBondsToConsiderASphereBroken" : 0,
+    "AutomaticTimestep"                : false,
+    "DeltaTimeSafetyFactor"            : 1.0,
+    "ControlTime"                      : 4.0,
+    "PostPoissonRatio"                 : false,
+    "PostCharacteristicLength"         : false,
+    "PostNodalArea"                    : false,
+    "PostContactSigma"                 : true,
+    "PostContactTau"                   : true,
+    "PostFailureCriterionState"        : true,
+    "PostMeanContactArea"              : false,
+    "PostRHS"                          : false,
+    "PostDampForces"                   : false,
+    "PostAppliedForces"                : true,
+    "PostGroupId"                      : false,
+    "PostExportId"                     : false,
+    "post_vtk_option"                  : false
+}
+

dem/use_cases/a_simple_3D_DEM_case/test_PBMDEM.mdpa

@@ -0,0 +1,55 @@
+Begin ModelPartData
+//  VARIABLE_NAME value
+End ModelPartData
+
+Begin Properties 0
+End Properties
+
+Begin Nodes
+1 -0.1 0.0 0.1
+2 0.1 0.0 0.1
+3 -0.1 0.0 -0.1
+4 0.1 0.0 -0.1
+5 0.0 0.141421356237 0.0
+6 0.0 -0.141421356237 0.0
+End Nodes
+
+
+Begin Elements SphericParticle3D// GUI group identifier: Body
+1 0 1
+2 0 2
+3 0 3
+4 0 4
+5 0 5
+6 0 6
+End Elements
+
+Begin NodalData RADIUS // GUI group identifier: Body
+       1 0 0.1
+       2 0 0.1 
+       3 0 0.1
+       4 0 0.1
+       5 0 0.1
+       6 0 0.1
+End NodalData
+
+Begin SubModelPart DEMParts_Body // Group Body // Subtree DEMParts
+Begin SubModelPartNodes
+1
+2
+3
+4
+5
+6
+End SubModelPartNodes
+Begin SubModelPartElements
+1
+2
+3
+4
+5
+6
+End SubModelPartElements
+Begin SubModelPartConditions
+End SubModelPartConditions
+End SubModelPart

dem/use_cases/a_simple_3D_DEM_case/test_PBMDEM_FEM_boundary.mdpa

@@ -0,0 +1,88 @@
+Begin ModelPartData
+//  VARIABLE_NAME value
+End ModelPartData
+
+Begin Properties 0
+End Properties
+
+Begin Nodes
+1 -0.2 0.241421356237 0.2
+2 -0.2 0.241421356237 -0.2
+3 0.2 0.241421356237 -0.2
+4 0.2 0.241421356237 0.2
+5 -0.2 -0.241421356237 0.2
+6 -0.2 -0.241421356237 -0.2
+7 0.2 -0.241421356237 -0.2
+8 0.2 -0.241421356237 0.2
+End Nodes
+
+
+Begin Conditions RigidFace3D4N// GUI group identifier: TOP
+1001 0 1 2 3 4
+End Conditions
+
+Begin Conditions RigidFace3D4N// GUI group identifier: BOTTOM
+2001 0 5 6 7 8
+End Conditions
+
+Begin SubModelPart DEM-FEM-Wall_TOP // DEM-FEM-Wall - group identifier: TOP
+  Begin SubModelPartData // DEM-FEM-Wall. Group name: TOP
+    LINEAR_VELOCITY [3] (-0.0, -0.05, -0.0)
+    VELOCITY_PERIOD 0.0
+    ANGULAR_VELOCITY [3] (0.0,0.0,0.0)
+    ROTATION_CENTER [3] (0.0,0.0,0.0)
+    ANGULAR_VELOCITY_PERIOD 0.0
+    VELOCITY_START_TIME 0.0
+    VELOCITY_STOP_TIME 100.0
+    ANGULAR_VELOCITY_START_TIME 0.0
+    ANGULAR_VELOCITY_STOP_TIME 100.0
+    FIXED_MESH_OPTION 0
+    RIGID_BODY_MOTION 1
+    FREE_BODY_MOTION 0
+    IS_GHOST 0
+    IDENTIFIER TOP
+    FORCE_INTEGRATION_GROUP 0
+  End SubModelPartData
+  Begin SubModelPartNodes
+      1
+      2
+      3
+      4
+  End SubModelPartNodes
+
+Begin SubModelPartConditions
+      1001
+End SubModelPartConditions
+
+End SubModelPart
+
+Begin SubModelPart DEM-FEM-Wall_BOTTOM // DEM-FEM-Wall - group identifier: BOTTOM
+  Begin SubModelPartData // DEM-FEM-Wall. Group name: BOTTOM
+    LINEAR_VELOCITY [3] (0.0, 0.05, 0.0)
+    VELOCITY_PERIOD 0.0
+    ANGULAR_VELOCITY [3] (0.0,0.0,0.0)
+    ROTATION_CENTER [3] (0.0,0.0,0.0)
+    ANGULAR_VELOCITY_PERIOD 0.0
+    VELOCITY_START_TIME 0.0
+    VELOCITY_STOP_TIME 100.0
+    ANGULAR_VELOCITY_START_TIME 0.0
+    ANGULAR_VELOCITY_STOP_TIME 100.0
+    FIXED_MESH_OPTION 0
+    RIGID_BODY_MOTION 1
+    FREE_BODY_MOTION 0
+    IS_GHOST 0
+    IDENTIFIER BOTTOM
+    FORCE_INTEGRATION_GROUP 0
+  End SubModelPartData
+  Begin SubModelPartNodes
+         5
+         6
+         7
+         8
+  End SubModelPartNodes
+Begin SubModelPartConditions
+      2001
+End SubModelPartConditions
+
+End SubModelPart
+