SimpleInnerProduct.hpp

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/*
 * ------------------------------------------------------------------------------------------------------------
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (c) 2018-2020 Lawrence Livermore National Security LLC
 * Copyright (c) 2018-2020 The Board of Trustees of the Leland Stanford Junior University
 * Copyright (c) 2018-2020 TotalEnergies
 * Copyright (c) 2019-     GEOSX Contributors
 * All rights reserved
 *
 * See top level LICENSE, COPYRIGHT, CONTRIBUTORS, NOTICE, and ACKNOWLEDGEMENTS files for details.
 * ------------------------------------------------------------------------------------------------------------
 */
 
#ifndef GEOS_FINITEVOLUME_MIMETICINNERPRODUCTS_SIMPLEINNERPRODUCT_HPP_
#define GEOS_FINITEVOLUME_MIMETICINNERPRODUCTS_SIMPLEINNERPRODUCT_HPP_
 
#include "finiteVolume/mimeticInnerProducts/MimeticInnerProductBase.hpp"
#include "finiteVolume/mimeticInnerProducts/MimeticInnerProductHelpers.hpp"
#include "mesh/utilities/ComputationalGeometry.hpp"
 
namespace geos
{
namespace mimeticInnerProduct
{
 
class SimpleInnerProduct : public MimeticInnerProductBase
{
public:
 
  template< localIndex NF >
  GEOS_HOST_DEVICE
  static void
  compute( arrayView2d< real64 const, nodes::REFERENCE_POSITION_USD > const & nodePosition,
           arrayView1d< real64 const > const & transMultiplier,
           ArrayOfArraysView< localIndex const > const & faceToNodes,
           arraySlice1d< localIndex const > const & elemToFaces,
           arraySlice1d< real64 const > const & elemCenter,
           real64 const & elemVolume,
           real64 const (&elemPerm)[ 3 ],
           real64 const & lengthTolerance,
           arraySlice2d< real64 > const & transMatrix );
 
};
 
template< localIndex NF >
GEOS_HOST_DEVICE
void
SimpleInnerProduct::compute( arrayView2d< real64 const, nodes::REFERENCE_POSITION_USD > const & nodePosition,
                             arrayView1d< real64 const > const & transMultiplier,
                             ArrayOfArraysView< localIndex const > const & faceToNodes,
                             arraySlice1d< localIndex const > const & elemToFaces,
                             arraySlice1d< real64 const > const & elemCenter,
                             real64 const & elemVolume,
                             real64 const (&elemPerm)[ 3 ],
                             real64 const & lengthTolerance,
                             arraySlice2d< real64 > const & transMatrix )
{
  real64 const areaTolerance = lengthTolerance * lengthTolerance;
  real64 const weightToleranceInv = 1e30 / lengthTolerance;
 
  real64 cellToFaceMat[ NF ][ 3 ] = {{ 0 }};
  real64 normalsMat[ NF ][ 3 ] = {{ 0 }};
  real64 permMat[ 3 ][ 3 ] = {{ 0 }};
 
  real64 work_dimByNumFaces[ 3 ][ NF ] = {{ 0 }};
  real64 worka_numFacesByNumFaces[ NF ][ NF ] = {{ 0 }};
  real64 workb_numFacesByNumFaces[ NF ][ NF ] = {{ 0 }};
  real64 workc_numFacesByNumFaces[ NF ][ NF ] = {{ 0 }};
 
  real64 tpTransInv[ NF ] = { 0.0 };
 
  real64 q0[ NF ], q1[ NF ], q2[ NF ];
  real64 faceArea[ NF ];
 
 
  // 0) assemble full coefficient tensor from principal axis/components
  MimeticInnerProductHelpers::makeFullTensor( elemPerm, permMat );
 
  // 1) fill the matrices cellToFaceMat and normalsMat row by row
  for( localIndex ifaceLoc = 0; ifaceLoc < NF; ++ifaceLoc )
  {
    real64 faceCenter[ 3 ], faceNormal[ 3 ], cellToFaceVec[ 3 ];
    // compute the face geometry data: center, normal, vector from cell center to face center
    faceArea[ ifaceLoc ] =
      computationalGeometry::centroid_3DPolygon( faceToNodes[elemToFaces[ifaceLoc]],
                                                 nodePosition,
                                                 faceCenter,
                                                 faceNormal,
                                                 areaTolerance );
 
    LvArray::tensorOps::copy< 3 >( cellToFaceVec, faceCenter );
    LvArray::tensorOps::subtract< 3 >( cellToFaceVec, elemCenter );
 
    q0[ ifaceLoc ] = faceArea[ ifaceLoc ] * cellToFaceVec[ 0 ];
    q1[ ifaceLoc ] = faceArea[ ifaceLoc ] * cellToFaceVec[ 1 ];
    q2[ ifaceLoc ] = faceArea[ ifaceLoc ] * cellToFaceVec[ 2 ];
 
    if( LvArray::tensorOps::AiBi< 3 >( cellToFaceVec, faceNormal ) < 0.0 )
    {
      LvArray::tensorOps::scale< 3 >( faceNormal, -1 );
    }
 
    // the two-point transmissibility is computed to computed here because it is needed
    // in the implementation of the transmissibility multiplier (see below)
    // TODO: see what it would take to bring the (harmonically averaged) two-point trans here
    real64 diagEntry = 0.0;
    MimeticInnerProductHelpers::computeInvTPFATransWithMultiplier< NF >( elemPerm,
                                                                         faceNormal,
                                                                         faceArea[ifaceLoc],
                                                                         transMultiplier[elemToFaces[ifaceLoc]],
                                                                         weightToleranceInv,
                                                                         cellToFaceVec,
                                                                         diagEntry );
    tpTransInv[ifaceLoc] = diagEntry;
 
    LvArray::tensorOps::scale< 3 >( faceNormal, faceArea[ ifaceLoc ] );
    normalsMat[ ifaceLoc ][ 0 ] = faceNormal[ 0 ];
    normalsMat[ ifaceLoc ][ 1 ] = faceNormal[ 1 ];
    normalsMat[ ifaceLoc ][ 2 ] = faceNormal[ 2 ];
 
  }
 
  // 2) compute the stabilization coefficient
  real64 const tParam = 2 * LvArray::tensorOps::trace< 3 >( permMat );
 
  // 3) compute N K N'
  LvArray::tensorOps::Rij_eq_AikBjk< 3, NF, 3 >( work_dimByNumFaces,
                                                 permMat,
                                                 normalsMat );
  LvArray::tensorOps::Rij_eq_AikBkj< NF, NF, 3 >( transMatrix,
                                                  normalsMat,
                                                  work_dimByNumFaces );
 
  // 4) compute the orthonormalization of the matrix cellToFaceVec
  MimeticInnerProductHelpers::orthonormalize< NF >( q0, q1, q2, cellToFaceMat );
 
  // 5) compute P_Q = I - QQ'
  // note: we compute -P_Q here
  LvArray::tensorOps::addIdentity< NF >( worka_numFacesByNumFaces, -1 );
  LvArray::tensorOps::Rij_add_AikAjk< NF, 3 >( worka_numFacesByNumFaces,
                                               cellToFaceMat );
 
  // 6) compute D P_Q D where D = diag( faceArea )
  // 7) compute T = ( N K N' + t D P_Q D ) / elemVolume
  for( localIndex i = 0; i < NF; ++i )
  {
    workb_numFacesByNumFaces[ i ][ i ] = faceArea[ i ];
  }
 
  LvArray::tensorOps::Rij_eq_AikBkj< NF, NF, NF >( workc_numFacesByNumFaces,
                                                   workb_numFacesByNumFaces,
                                                   worka_numFacesByNumFaces );
 
 
  LvArray::tensorOps::scale< NF, NF >( transMatrix, 1 / elemVolume );
  LvArray::tensorOps::scale< NF, NF >( workc_numFacesByNumFaces, -tParam / elemVolume );
  LvArray::tensorOps::Rij_add_AikBkj< NF, NF, NF >( transMatrix,
                                                    workc_numFacesByNumFaces,
                                                    workb_numFacesByNumFaces );
 
  // 7) incorporate the transmissbility multipliers
  // Ref: Nilsen, H. M., J. R. Natvig, and K.-A Lie.,
  // "Accurate modeling of faults by multipoint, mimetic, and mixed methods." SPEJ
 
  if( !isZero( LvArray::tensorOps::l2NormSquared< NF >( tpTransInv ) ) )
  {
    MimeticInnerProductHelpers::computeTransMatrixWithMultipliers< NF >( tpTransInv,
                                                                         transMatrix );
  }
 
}
 
} // end namespace mimeticInnerProduct
 
} // end namespace geos
 
 
#endif //GEOS_FINITEVOLUME_MIMETICINNERPRODUCTS_SIMPLEINNERPRODUCT_HPP_