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HexahedronFEMForceFieldAndMass

Hexahedral finite elements with mass

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 objet 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
isCompliance Consider the component as a compliance, else as a stiffness 0
rayleighStiffness Rayleigh damping - stiffness matrix coefficient 0
separateGravity add separately gravity to velocity computation 0
rayleighMass Rayleigh damping - mass matrix coefficient 0
method "large" or "polar" or "small" displacements large
poissonRatio FEM Poisson Ratio in Hooke's law [0,0.5[ 0.45
youngModulus FEM Young's modulus in Hooke's law 5000
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

Links:

Name Description
context Graph Node containing this object (or BaseContext::getDefault() if no graph is used)
slaves Sub-objects used internally by this object
master nullptr for regular objects, or master object for which this object is one sub-objects
mechanicalStates List of mechanical states to which this component is associated
mstate MechanicalState used by this component
topology link to the topology container

Examples

Component/SolidMechanics/FEM/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(rootNode):

    root = rootNode.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')