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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
6ba4e39
Merge branch 'develop' into jafranc/fix/perElementTypeScaling
jafranc Jul 8, 2026
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16 changes: 14 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 @@ -1975,6 +1976,10 @@ 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 Down Expand Up @@ -2006,12 +2011,19 @@ 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 );
// For tetrahedra (triangle faces): charLength = edge = (6*sqrt(2)*V)^(1/3)
// For hexahedra (quadrilateral faces): charLength = (V)^(1/3)
real64 const charLength = isTriangle
? pow( 6 * std::sqrt( 2 ) * volume, 1.0 / 3.0 )
: pow( volume, 1.0 / 3.0 );
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// 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;

stiffDiagApprox[ i ][ 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
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