AcousticMatricesSEMKernel.hpp

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/*
 * ------------------------------------------------------------------------------------------------------------
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (c) 2016-2024 Lawrence Livermore National Security LLC
 * Copyright (c) 2018-2024 Total, S.A
 * Copyright (c) 2018-2024 The Board of Trustees of the Leland Stanford Junior University
 * Copyright (c) 2023-2024 Chevron
 * Copyright (c) 2019-     GEOS/GEOSX Contributors
 * All rights reserved
 *
 * See top level LICENSE, COPYRIGHT, CONTRIBUTORS, NOTICE, and ACKNOWLEDGEMENTS files for details.
 * ------------------------------------------------------------------------------------------------------------
 */
 
#ifndef GEOS_PHYSICSSOLVERS_WAVEPROPAGATION_ACOUSTICMATRICESSEMKERNEL_HPP_
#define GEOS_PHYSICSSOLVERS_WAVEPROPAGATION_ACOUSTICMATRICESSEMKERNEL_HPP_
 
namespace geos
{
 
struct AcousticMatricesSEM
{
 
  template< typename FE_TYPE >
  struct MassMatrix
  {
 
    MassMatrix( FE_TYPE const & finiteElement )
      : m_finiteElement( finiteElement )
    {}
    template< typename EXEC_POLICY, typename ATOMIC_POLICY >
    void
    computeMassMatrix( localIndex const size,
                       arrayView2d< WaveSolverBase::wsCoordType const, nodes::REFERENCE_POSITION_USD > const nodeCoords,
                       arrayView2d< localIndex const, cells::NODE_MAP_USD > const elemsToNodes,
                       arrayView1d< real32 const > const velocity,
                       arrayView1d< real32 const > const density,
                       arrayView1d< real32 > const mass )
 
    {
      forAll< EXEC_POLICY >( size, [=] GEOS_HOST_DEVICE ( localIndex const e )
      {
 
        real32 const invC2 = 1.0 / ( density[e] * pow( velocity[e], 2 ) );
        // only the eight corners of the mesh cell are needed to compute the Jacobian
        real64 xLocal[ 8 ][ 3 ];
        for( localIndex a = 0; a < 8; ++a )
        {
          localIndex const nodeIndex = elemsToNodes( e, FE_TYPE::meshIndexToLinearIndex3D( a ) );
          for( localIndex i = 0; i < 3; ++i )
          {
            xLocal[a][i] = nodeCoords( nodeIndex, i );
          }
        }
        constexpr localIndex numQuadraturePointsPerElem = FE_TYPE::numQuadraturePoints;
        for( localIndex q = 0; q < numQuadraturePointsPerElem; ++q )
        {
          real32 const localIncrement = invC2 * m_finiteElement.computeMassTerm( q, xLocal );
          RAJA::atomicAdd< ATOMIC_POLICY >( &mass[elemsToNodes( e, q )], localIncrement );
        }
      } ); // end loop over element
    }
 
    FE_TYPE const & m_finiteElement;
 
  };
  template< typename FE_TYPE >
  struct DampingMatrix
  {
 
    DampingMatrix( FE_TYPE const & finiteElement )
      : m_finiteElement( finiteElement )
    {}
 
    template< typename EXEC_POLICY, typename ATOMIC_POLICY >
    void
    computeDampingMatrix( localIndex const size,
                          arrayView2d< WaveSolverBase::wsCoordType const, nodes::REFERENCE_POSITION_USD > const nodeCoords,
                          arrayView2d< localIndex const > const elemsToFaces,
                          ArrayOfArraysView< localIndex const > const facesToNodes,
                          arrayView1d< integer const > const facesDomainBoundaryIndicator,
                          arrayView1d< localIndex const > const freeSurfaceFaceIndicator,
                          arrayView1d< real32 const > const velocity,
                          arrayView1d< real32 const > const density,
                          arrayView1d< real32 > const damping )
    {
      forAll< EXEC_POLICY >( size, [=] GEOS_HOST_DEVICE ( localIndex const e )
      {
        for( localIndex i = 0; i < elemsToFaces.size( 1 ); ++i )
        {
          localIndex const f = elemsToFaces( e, i );
          // face on the domain boundary and not on free surface
          if( facesDomainBoundaryIndicator[f] == 1 && freeSurfaceFaceIndicator[f] != 1 )
          {
            // only the four corners of the mesh face are needed to compute the Jacobian
            real64 xLocal[ 4 ][ 3 ];
            for( localIndex a = 0; a < 4; ++a )
            {
              localIndex const nodeIndex = facesToNodes( f, FE_TYPE::meshIndexToLinearIndex2D( a ) );
              for( localIndex d = 0; d < 3; ++d )
              {
                xLocal[a][d] = nodeCoords( nodeIndex, d );
              }
            }
            real32 const alpha = 1.0 / (density[e] * velocity[e]);
            constexpr localIndex numNodesPerFace = FE_TYPE::numNodesPerFace;
            for( localIndex q = 0; q < numNodesPerFace; ++q )
            {
              real32 const localIncrement = alpha * m_finiteElement.computeDampingTerm( q, xLocal );
              RAJA::atomicAdd< ATOMIC_POLICY >( &damping[facesToNodes( f, q )], localIncrement );
            }
          }
        }
      } );
    }
 
    FE_TYPE const & m_finiteElement;
 
  };
 
 
 
};
 
} // namespace geos
 
#endif //GEOS_PHYSICSSOLVERS_WAVEPROPAGATION_ACOUSTICMATRICESSEMKERNEL_HPP_