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plane_strain.py
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plane_strain.py
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from geotaichi import *
init(device_memory_GB=4)
dempm = DEMPM()
dempm.set_configuration(domain=ti.Vector([1.04, 0.14, 0.5]),
coupling_scheme="DEM-MPM",
particle_interaction=True,
wall_interaction=False)
dempm.dem.set_configuration(
boundary=["Destroy", "Destroy", "Destroy"],
gravity=ti.Vector([0., 0., -9.8]),
engine="SymplecticEuler",
search="LinkedCell")
dempm.mpm.set_configuration(
background_damping=0.05,
alphaPIC=0.00005,
mapping="USL",
shape_function="GIMP",
gravity=ti.Vector([0., 0., -9.8]))
dempm.set_solver({
"Timestep": 1e-6,
"SimulationTime": 0.2,
"SaveInterval": 0.002,
"SavePath": 'OutputData/velz112'
})
dempm.dem.memory_allocate(memory={
"max_material_number": 1,
"max_particle_number": 1,
"max_sphere_number": 1,
"max_clump_number": 0,
"max_facet_number": 0,
"verlet_distance_multiplier": 0.2
})
dempm.mpm.memory_allocate(memory={
"max_material_number": 1,
"max_particle_number": 240000,
"max_constraint_number": {
"max_reflection_constraint": 61820,
"max_velocity_constraint": 4017
},
"verlet_distance_multiplier": 0.8
})
dempm.memory_allocate(memory={
"body_coordination_number": 50,
"wall_coordination_number": 6
})
dempm.dem.add_attribute(materialID=0,
attribute={
"Density": 7850,
"ForceLocalDamping": 0.,
"TorqueLocalDamping": 0.
})
dempm.dem.create_body(body={
"BodyType": "Sphere",
"Template":[{
"GroupID": 0,
"MaterialID": 0,
"InitialVelocity": ti.Vector([0., 0., -1.12]),
"InitialAngularVelocity": ti.Vector([0., 0., 0.]),
"BodyPoint": ti.Vector([0.52, 0.07, 0.3123]),
"FixVelocity": ["Free","Free","Free"],
"FixAngularVelocity": ["Free","Free","Free"],
"Radius": 0.0223,
"BodyOrientation": "uniform"
}]
})
dempm.dem.choose_contact_model(particle_particle_contact_model=None,
particle_wall_contact_model=None)
dempm.dem.select_save_data()
dempm.mpm.add_material(model="DruckerPrager",
material={
"MaterialID": 1,
"Density": 600,
"YoungModulus": 6.1e7,
"PoissionRatio": 0.2,
"Friction": 16,
"Dilation": 3.0,
"Cohesion": 0.0,
"Tensile": 0.0
})
dempm.mpm.add_element(element={
"ElementType": "R8N3D",
"ElementSize": ti.Vector([0.01, 0.01, 0.01])
})
dempm.mpm.add_region(region=[{
"Name": "region1",
"Type": "Rectangle",
"BoundingBoxPoint": ti.Vector([0.02, 0.02, 0.02]),
"BoundingBoxSize": ti.Vector([1.0, 0.1, 0.27]),
"zdirection": ti.Vector([0., 0., 1.])
}])
dempm.mpm.add_body(body={
"Template": [{
"RegionName": "region1",
"nParticlesPerCell": 2,
"BodyID": 0,
"MaterialID": 1,
"ParticleStress": {
"GravityField": True,
"InternalStress": ti.Vector([-0., -0., -0., 0., 0., 0.])
},
"InitialVelocity":ti.Vector([0, 0, 0]),
"FixVelocity": ["Free", "Free", "Free"]
}]
})
dempm.mpm.add_boundary_condition(boundary=[{
"BoundaryType": "VelocityConstraint",
"Velocity": [0, 0, 0],
"StartPoint": [0, 0, 0],
"EndPoint": [1.02, 0.12, 0.02]
},
{
"BoundaryType": "ReflectionConstraint",
"Norm": [-1, 0., 0],
"StartPoint": [0., 0., 0.],
"EndPoint": [0.02, 0.14, 0.5]
},
{
"BoundaryType": "ReflectionConstraint",
"Norm": [1, 0., 0],
"StartPoint": [1.02, 0, 0],
"EndPoint": [1.04, 0.14, 0.5]
},
{
"BoundaryType": "ReflectionConstraint",
"Norm": [0, -1., 0],
"StartPoint": [0., 0., 0.],
"EndPoint": [1.04, 0.02, 0.5]
},
{
"BoundaryType": "ReflectionConstraint",
"Norm": [0, 1., 0],
"StartPoint": [0, 0.12, 0],
"EndPoint": [1.04, 0.14, 0.5]
}])
dempm.mpm.select_save_data()
dempm.choose_contact_model(particle_particle_contact_model="Linear Model",
particle_wall_contact_model=None)
dempm.add_property(DEMmaterial=0,
MPMmaterial=1,
property={
"NormalStiffness": 6.5e6,
"TangentialStiffness": 3.3e6,
"Friction": 0.28,
"NormalViscousDamping": 0.0,
"TangentialViscousDamping": 0.0
})
dempm.run()
dempm.dem.postprocessing()
dempm.mpm.postprocessing()