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HexahedronFEMForceFieldAndMass

Hexahedral finite elements with mass.

Vec3d

Templates:

  • Vec3d

Target: Sofa.Component.SolidMechanics.FEM.Elastic

namespace: sofa::component::solidmechanics::fem::elastic

parents:

  • Mass
  • HexahedronFEMForceField

Data

Name Description Default value
name object name unnamed
printLog if true, emits extra messages at runtime. 0
tags list of the subsets the object belongs to
bbox this object bounding box
componentState The state of the component among (Dirty, Valid, Undefined, Loading, Invalid). Undefined
listening if true, handle the events, otherwise ignore the events 0
rayleighStiffness Rayleigh damping - stiffness matrix coefficient 0
separateGravity add separately gravity to velocity computation 0
rayleighMass Rayleigh damping - mass matrix coefficient 0
poissonRatio FEM Poisson Ratio in Hooke's law [0,0.5[ 0.45
youngModulus FEM Young's Modulus in Hooke's law 5000
method "large" or "polar" or "small" displacements large
updateStiffnessMatrix 0
gatherPt number of dof accumulated per threads during the gather operation (Only use in GPU version)
gatherBsize number of dof accumulated per threads during the gather operation (Only use in GPU version)
stiffnessMatrices Stiffness matrices per element (K_i)
initialPoints Initial Position
massMatrices Mass matrices per element (M_i)
density density == volumetric mass in english (kg.m-3) 1
lumpedMass Does it use lumped masses? 0
Visualization
drawing draw the forcefield if true 1
drawPercentageOffset size of the hexa 0.15
Name Description Destination type name
context Graph Node containing this object (or BaseContext::getDefault() if no graph is used) BaseContext
slaves Sub-objects used internally by this object BaseObject
master nullptr for regular objects, or master object for which this object is one sub-objects BaseObject
mechanicalStates List of mechanical states to which this component is associated BaseMechanicalState
mstate MechanicalState used by this component MechanicalState<Vec3d>
topology link to the topology container BaseMeshTopology

Examples

HexahedronFEMForceFieldAndMass.scn

<?xml version="1.0"?>
<Node name="root" dt="0.02">
    <RequiredPlugin name="Sofa.Component.Collision.Detection.Algorithm"/> <!-- Needed to use components [BVHNarrowPhase BruteForceBroadPhase CollisionPipeline] -->
    <RequiredPlugin name="Sofa.Component.Collision.Detection.Intersection"/> <!-- Needed to use components [MinProximityIntersection] -->
    <RequiredPlugin name="Sofa.Component.Collision.Geometry"/> <!-- Needed to use components [LineCollisionModel PointCollisionModel TriangleCollisionModel] -->
    <RequiredPlugin name="Sofa.Component.Collision.Response.Contact"/> <!-- Needed to use components [CollisionResponse] -->
    <RequiredPlugin name="Sofa.Component.Constraint.Projective"/> <!-- Needed to use components [FixedProjectiveConstraint] -->
    <RequiredPlugin name="Sofa.Component.LinearSolver.Iterative"/> <!-- Needed to use components [CGLinearSolver] -->
    <RequiredPlugin name="Sofa.Component.ODESolver.Backward"/> <!-- Needed to use components [EulerImplicitSolver] -->
    <RequiredPlugin name="Sofa.Component.SolidMechanics.FEM.Elastic"/> <!-- Needed to use components [HexahedronFEMForceFieldAndMass] -->
    <RequiredPlugin name="Sofa.Component.StateContainer"/> <!-- Needed to use components [MechanicalObject] -->
    <RequiredPlugin name="Sofa.Component.Topology.Container.Grid"/> <!-- Needed to use components [RegularGridTopology] -->
    <RequiredPlugin name="Sofa.Component.Visual"/> <!-- Needed to use components [VisualStyle] -->

    <DefaultAnimationLoop/>
    <VisualStyle displayFlags="showBehaviorModels showForceFields" />
    <CollisionPipeline depth="6" verbose="0" draw="0" />
    <BruteForceBroadPhase/>
    <BVHNarrowPhase/>
    <MinProximityIntersection name="Proximity" alarmDistance="0.5" contactDistance="0.3" />
    <CollisionResponse name="Response" response="PenalityContactForceField" />
    <Node name="M1">
        <EulerImplicitSolver name="cg_odesolver" printLog="false"  rayleighStiffness="0.1" rayleighMass="0.1" />
        <CGLinearSolver iterations="25" name="linear solver" tolerance="1.0e-9" threshold="1.0e-9" />
        <MechanicalObject />
        <RegularGridTopology nx="4" ny="4" nz="20" xmin="-9" xmax="-6" ymin="0" ymax="3" zmin="0" zmax="19" />
        <FixedProjectiveConstraint indices="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15" />
        <HexahedronFEMForceFieldAndMass name="FEM" youngModulus="40000" poissonRatio="0.3" method="large" density="1" />
        <TriangleCollisionModel />
        <LineCollisionModel />
        <PointCollisionModel />
    </Node>
</Node>

def createScene(root_node):

   root = root_node.addChild('root', dt="0.02")

   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Detection.Algorithm")
   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Detection.Intersection")
   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Geometry")
   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Response.Contact")
   root.addObject('RequiredPlugin', name="Sofa.Component.Constraint.Projective")
   root.addObject('RequiredPlugin', name="Sofa.Component.LinearSolver.Iterative")
   root.addObject('RequiredPlugin', name="Sofa.Component.ODESolver.Backward")
   root.addObject('RequiredPlugin', name="Sofa.Component.SolidMechanics.FEM.Elastic")
   root.addObject('RequiredPlugin', name="Sofa.Component.StateContainer")
   root.addObject('RequiredPlugin', name="Sofa.Component.Topology.Container.Grid")
   root.addObject('RequiredPlugin', name="Sofa.Component.Visual")
   root.addObject('DefaultAnimationLoop', )
   root.addObject('VisualStyle', displayFlags="showBehaviorModels showForceFields")
   root.addObject('CollisionPipeline', depth="6", verbose="0", draw="0")
   root.addObject('BruteForceBroadPhase', )
   root.addObject('BVHNarrowPhase', )
   root.addObject('MinProximityIntersection', name="Proximity", alarmDistance="0.5", contactDistance="0.3")
   root.addObject('CollisionResponse', name="Response", response="PenalityContactForceField")

   m1 = root.addChild('M1')

   m1.addObject('EulerImplicitSolver', name="cg_odesolver", printLog="false", rayleighStiffness="0.1", rayleighMass="0.1")
   m1.addObject('CGLinearSolver', iterations="25", name="linear solver", tolerance="1.0e-9", threshold="1.0e-9")
   m1.addObject('MechanicalObject', )
   m1.addObject('RegularGridTopology', nx="4", ny="4", nz="20", xmin="-9", xmax="-6", ymin="0", ymax="3", zmin="0", zmax="19")
   m1.addObject('FixedProjectiveConstraint', indices="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15")
   m1.addObject('HexahedronFEMForceFieldAndMass', name="FEM", youngModulus="40000", poissonRatio="0.3", method="large", density="1")
   m1.addObject('TriangleCollisionModel', )
   m1.addObject('LineCollisionModel', )
   m1.addObject('PointCollisionModel', )