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refact: Contact Mech - dispatch scaling wrt to fracture element type #4083

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refact: Contact Mech - dispatch scaling wrt to fracture element type #4083

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2bf033a
right tetra scaling
jafranc Jun 2, 2026
7a3b5c0
rough dispatch
jafranc Jun 3, 2026
85b5f1f
restore anisotropic box scaling
jafranc Jun 19, 2026
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63 changes: 61 additions & 2 deletions ...onents/physicsSolvers/solidMechanics/contact/SolidMechanicsAugmentedLagrangianContact.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@
#include "finiteElement/FiniteElementDiscretization.hpp"
#include "mesh/DomainPartition.hpp"

#include <cmath>
#include <stdio.h>

#if defined( GEOS_USE_CUDA )
Expand Down Expand Up @@ -105,6 +106,11 @@ SolidMechanicsAugmentedLagrangianContact::SolidMechanicsAugmentedLagrangianConta
setApplyDefaultValue( 5.e-02 ).
setDescription( "Tolerance for the sliding check" );

registerWrapper( viewKeyStruct::symmetricString(), &m_isAnisotropic ).
setInputFlag( InputFlags::OPTIONAL ).
setApplyDefaultValue( 1 ).
setDescription( "Flag to use anisotropic scaling in tolerances and penalties computations" );

// Set the default linear solver parameters
LinearSolverParameters & linSolParams = m_linearSolverParameters.get();

Expand Down Expand Up @@ -1932,6 +1938,7 @@ void SolidMechanicsAugmentedLagrangianContact::computeTolerances( DomainPartitio
string_array const & )
{
FaceManager const & faceManager = mesh.getFaceManager();
NodeManager const & nodeManager = mesh.getNodeManager();
ElementRegionManager & elemManager = mesh.getElemManager();

// Get the "face to element" map (valid for the entire mesh)
Expand All @@ -1954,6 +1961,11 @@ void SolidMechanicsAugmentedLagrangianContact::computeTolerances( DomainPartitio
using NodeMapViewType = arrayView2d< localIndex const, cells::NODE_MAP_USD >;
ElementRegionManager::ElementViewAccessor< NodeMapViewType > const elemToNode =
elemManager.constructViewAccessor< CellElementSubRegion::NodeMapType, NodeMapViewType >( ElementSubRegionBase::viewKeyStruct::nodeListString() );

ElementRegionManager::ElementViewConst< NodeMapViewType > const elemToNodeView = elemToNode.toNestedViewConst();

// Get the coordinates for all nodes
arrayView2d< real64 const, nodes::REFERENCE_POSITION_USD > const nodePosition = nodeManager.referencePosition();

elemManager.forElementSubRegions< FaceElementSubRegion >( [&]( FaceElementSubRegion & subRegion )
{
Expand All @@ -1975,6 +1987,10 @@ void SolidMechanicsAugmentedLagrangianContact::computeTolerances( DomainPartitio

arrayView1d< integer const > const ghostRank = subRegion.ghostRank();

// Triangle face elements bound tetrahedral bulk elements; quadrilateral faces bound hexahedral ones.
// The charLength formula differs between the two element types.
bool const isTriangle = subRegion.size() > 0 && subRegion.getElementType( 0 ) == ElementType::Triangle;

forAll< parallelHostPolicy >( subRegion.size(), [=] ( localIndex const kfe )
{

Expand All @@ -1992,6 +2008,7 @@ void SolidMechanicsAugmentedLagrangianContact::computeTolerances( DomainPartitio

for( localIndex i = 0; i < 2; ++i )
{

localIndex const faceIndex = elemsToFaces[kfe][i];
localIndex const er = faceToElemRegion[faceIndex][0];
localIndex const esr = faceToElemSubRegion[faceIndex][0];
Expand All @@ -2006,12 +2023,54 @@ void SolidMechanicsAugmentedLagrangianContact::computeTolerances( DomainPartitio
real64 const nu = ( 3.0 * K - 2.0 * G ) / ( 2.0 * ( 3.0 * K + G ) );
real64 const M = K + 4.0 / 3.0 * G;

real64 const charLength = pow( volume, 1.0 / 3.0 );
real64 bbox[3]{};

if(m_isAnisotropic)
{
NodeMapViewType const & cellElemsToNodes = elemToNodeView[er][esr];
localIndex const numNodesPerElem = cellElemsToNodes.size( 1 );

real64 maxSize[3];
real64 minSize[3];
for( localIndex j = 0; j < 3; ++j )
{
maxSize[j] = nodePosition[cellElemsToNodes[ei][0]][j];
minSize[j] = nodePosition[cellElemsToNodes[ei][0]][j];
}

for( localIndex a = 1; a < numNodesPerElem; ++a )
{
for( localIndex j = 0; j < 3; ++j )
{
maxSize[j] = fmax( maxSize[j], nodePosition[cellElemsToNodes[ei][a]][j] );
minSize[j] = fmin( minSize[j], nodePosition[cellElemsToNodes[ei][a]][j] );
}
}

for( localIndex j = 0; j < 3; ++j )
{
bbox[j] = maxSize[j] - minSize[j];
}


}

// For anisotropic factor: XYZ-aligned bbox length
// For tetrahedra (triangle faces): charLength = edge = (6*sqrt(2)*V)^(1/3)
// For hexahedra (quadrilateral faces): charLength = (V)^(1/3)
real64 const charLength = m_isAnisotropic ? bbox[0] : ( isTriangle
? pow( 6 * std::sqrt( 2 ) * volume, 1.0 / 3.0 )
: pow( volume, 1.0 / 3.0 ) );

// Combine E and nu to obtain a stiffness approximation (like it was an hexahedron)
for( localIndex j = 0; j < 3; ++j )
{
stiffDiagApprox[ i ][ j ] = E / ( ( 1.0 + nu )*( 1.0 - 2.0*nu ) ) * 4.0 / 9.0 * ( 2.0 - 3.0 * nu ) * charLength;

//TODO (jafranc) once stabilized, get rid of this ugly ternary
stiffDiagApprox[ i ][ j ] = m_isAnisotropic ? E / ( ( 1.0 + nu )*( 1.0 - 2.0*nu ) ) * 4.0 / 9.0 * ( 2.0 - 3.0 * nu ) * volume / bbox[j] / bbox[j]
: ( isTriangle
? E / ( ( 1.0 + nu )*( 1.0 - 2.0*nu ) ) * ( 2.0 - 3.0 * nu ) * charLength
: E / ( ( 1.0 + nu )*( 1.0 - 2.0*nu ) ) * 4.0 / 9.0 * ( 2.0 - 3.0 * nu ) * charLength );
}

averageYoungModulus += 0.5*E;
Expand Down
5 changes: 5 additions & 0 deletions ...onents/physicsSolvers/solidMechanics/contact/SolidMechanicsAugmentedLagrangianContact.hpp
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Expand Up @@ -301,6 +301,8 @@ class SolidMechanicsAugmentedLagrangianContact : public ContactSolverBase
constexpr static char const * tolNormalTracFacString() { return "tolNormalTrac"; }

constexpr static char const * tolTauLimitString() { return "tolTauLimit"; }

constexpr static char const * anisotropicString() { return "anisotropic"; }

};

Expand Down Expand Up @@ -330,6 +332,9 @@ class SolidMechanicsAugmentedLagrangianContact : public ContactSolverBase
/// Factor to adjust the tolerance for normal traction
real64 m_tolNormalTracFac = 0.5;

/// Flag for anisotropic scaling in Tolerances and Penalties
int m_isAnisotropic = 1;

};

} /* namespace geos */
Expand Down
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