AccumulationKernels.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 TotalEnergies
 * 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_FLUIDFLOW_SINGLEPHASE_ACCUMULATIONKERNELS_HPP
#define GEOS_PHYSICSSOLVERS_FLUIDFLOW_SINGLEPHASE_ACCUMULATIONKERNELS_HPP
 
#include "common/DataTypes.hpp"
#include "common/GEOS_RAJA_Interface.hpp"
#include "constitutive/fluid/singlefluid/SingleFluidBase.hpp"
#include "constitutive/fluid/singlefluid/SingleFluidUtils.hpp"
#include "constitutive/solid/CoupledSolidBase.hpp"
#include "physicsSolvers/fluidFlow/FlowSolverBaseFields.hpp"
#include "physicsSolvers/fluidFlow/SinglePhaseBaseFields.hpp"
#include "codingUtilities/Utilities.hpp"
 
namespace geos
{
 
namespace singlePhaseBaseKernels
{
 
/******************************** AccumulationKernel ********************************/
 
template< typename SUBREGION_TYPE, integer NUM_DOF >
class AccumulationKernel
{
 
public:
  using SingleFluidProp = constitutive::SingleFluidVar< real64, 2, constitutive::singlefluid::LAYOUT_FLUID, constitutive::singlefluid::LAYOUT_FLUID_DER >;
 
  static constexpr integer numDof = NUM_DOF;
 
  static constexpr integer numEqn = NUM_DOF;
 
 
  static constexpr integer isThermal = NUM_DOF-1;
  using DerivOffset = constitutive::singlefluid::DerivativeOffsetC< isThermal >;
 
  AccumulationKernel( globalIndex const rankOffset,
                      string const dofKey,
                      SUBREGION_TYPE const & subRegion,
                      CRSMatrixView< real64, globalIndex const > const & localMatrix,
                      arrayView1d< real64 > const & localRhs )
    :
    m_rankOffset( rankOffset ),
    m_dofNumber( subRegion.template getReference< array1d< globalIndex > >( dofKey ) ),
    m_elemGhostRank( subRegion.ghostRank() ),
    m_mass( subRegion.template getField< fields::flow::mass >() ),
    m_mass_n( subRegion.template getField< fields::flow::mass_n >() ),
    m_dMass( subRegion.template getField< fields::flow::dMass >() ),
    m_localMatrix( localMatrix ),
    m_localRhs( localRhs )
  {}
 
  struct StackVariables
  {
public:
 
    // Residual information
 
    localIndex localRow = -1;
 
    globalIndex dofIndices[numDof]{};
 
    real64 localResidual[numEqn]{};
 
    real64 localJacobian[numEqn][numDof]{};
 
  };
 
  GEOS_HOST_DEVICE
  integer elemGhostRank( localIndex const ei ) const
  { return m_elemGhostRank( ei ); }
 
 
  GEOS_HOST_DEVICE
  void setup( localIndex const ei,
              StackVariables & stack ) const
  {
    // set row index and degrees of freedom indices for this element
    stack.localRow = m_dofNumber[ei] - m_rankOffset;
    for( integer idof = 0; idof < numDof; ++idof )
    {
      stack.dofIndices[idof] = m_dofNumber[ei] + idof;
    }
  }
 
  template< typename FUNC = NoOpFunc >
  GEOS_HOST_DEVICE
  void computeAccumulation( localIndex const ei,
                            StackVariables & stack,
                            FUNC && kernelOp = NoOpFunc{} ) const
  {
    // Residual contribution is mass conservation in the cell
    stack.localResidual[0] = m_mass[ei] - m_mass_n[ei];
 
    // Derivative of residual wrt to pressure in the cell
    stack.localJacobian[0][0] = m_dMass[ei][DerivOffset::dP];
 
    // Customize the kernel with this lambda
    kernelOp();
  }
 
  GEOS_HOST_DEVICE
  void complete( localIndex const GEOS_UNUSED_PARAM( ei ),
                 StackVariables & stack ) const
  {
    // add contribution to global residual and jacobian (no need for atomics here)
    m_localMatrix.template addToRow< serialAtomic >( stack.localRow,
                                                     stack.dofIndices,
                                                     stack.localJacobian[0],
                                                     numDof );
    m_localRhs[stack.localRow] += stack.localResidual[0];
 
  }
 
  template< typename POLICY, typename KERNEL_TYPE >
  static void
  launch( localIndex const numElems,
          KERNEL_TYPE const & kernelComponent )
  {
    GEOS_MARK_FUNCTION;
 
    forAll< POLICY >( numElems, [=] GEOS_HOST_DEVICE ( localIndex const ei )
    {
      if( kernelComponent.elemGhostRank( ei ) >= 0 )
      {
        return;
      }
 
      typename KERNEL_TYPE::StackVariables stack;
 
      kernelComponent.setup( ei, stack );
      kernelComponent.computeAccumulation( ei, stack );
      kernelComponent.complete( ei, stack );
    } );
  }
 
protected:
 
  globalIndex const m_rankOffset;
 
  arrayView1d< globalIndex const > const m_dofNumber;
 
  arrayView1d< integer const > const m_elemGhostRank;
 
  arrayView1d< real64 const > const m_mass;
  arrayView1d< real64 const > const m_mass_n;
  arrayView2d< real64 const, constitutive::singlefluid::USD_FLUID > const m_dMass;
 
  CRSMatrixView< real64, globalIndex const > const m_localMatrix;
  arrayView1d< real64 > const m_localRhs;
 
};
 
class SurfaceElementAccumulationKernel : public AccumulationKernel< SurfaceElementSubRegion, 1 >
{
 
public:
 
  using Base = AccumulationKernel< SurfaceElementSubRegion, 1 >;
 
  SurfaceElementAccumulationKernel( globalIndex const rankOffset,
                                    string const dofKey,
                                    SurfaceElementSubRegion const & subRegion,
                                    CRSMatrixView< real64, globalIndex const > const & localMatrix,
                                    arrayView1d< real64 > const & localRhs )
    : Base( rankOffset, dofKey, subRegion, localMatrix, localRhs )
    , m_creationMass( subRegion.getField< fields::flow::massCreated >() )
  {}
 
  GEOS_HOST_DEVICE
  void computeAccumulation( localIndex const ei,
                            Base::StackVariables & stack ) const
  {
    Base::computeAccumulation( ei, stack );
    if( Base::m_mass_n[ei] > 1.1 * m_creationMass[ei] )
    {
      stack.localResidual[0] += m_creationMass[ei] * 0.25;
    }
  }
 
protected:
 
  arrayView1d< real64 const > const m_creationMass;
 
};
 
class AccumulationKernelFactory
{
public:
 
  template< typename POLICY, typename SUBREGION_TYPE >
  static void
  createAndLaunch( globalIndex const rankOffset,
                   string const dofKey,
                   SUBREGION_TYPE const & subRegion,
                   CRSMatrixView< real64, globalIndex const > const & localMatrix,
                   arrayView1d< real64 > const & localRhs )
  {
    if constexpr ( std::is_base_of_v< CellElementSubRegion, SUBREGION_TYPE > )
    {
      integer constexpr NUM_DOF = 1;
      AccumulationKernel< CellElementSubRegion, NUM_DOF > kernel( rankOffset, dofKey, subRegion, localMatrix, localRhs );
      AccumulationKernel< CellElementSubRegion, NUM_DOF >::template launch< POLICY >( subRegion.size(), kernel );
    }
    else if constexpr ( std::is_base_of_v< SurfaceElementSubRegion, SUBREGION_TYPE > )
    {
      SurfaceElementAccumulationKernel kernel( rankOffset, dofKey, subRegion, localMatrix, localRhs );
      SurfaceElementAccumulationKernel::launch< POLICY >( subRegion.size(), kernel );
    }
    else
    {
      GEOS_UNUSED_VAR( rankOffset, dofKey, subRegion, localMatrix, localRhs );
      GEOS_ERROR( "Unsupported subregion type: " << typeid(SUBREGION_TYPE).name() );
    }
  }
 
};
 
} // namespace singlePhaseBaseKernels
 
} // namespace geos
 
#endif //GEOS_PHYSICSSOLVERS_FLUIDFLOW_SINGLEPHASE_ACCUMULATIONKERNELS_HPP