Panzer_STK_GatherFields_impl.hpp

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// @HEADER
// *****************************************************************************
//           Panzer: A partial differential equation assembly
//       engine for strongly coupled complex multiphysics systems
//
// Copyright 2011 NTESS and the Panzer contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER
 
#ifndef PANZER_STK_GATHER_FIELDS_IMPL_HPP
#define PANZER_STK_GATHER_FIELDS_IMPL_HPP
 
#include "Teuchos_Assert.hpp"
#include "Phalanx_DataLayout.hpp"
 
#include "Panzer_BasisIRLayout.hpp"
 
#include "Teuchos_FancyOStream.hpp"
 
// **********************************************************************
// Specialization: Residual
// **********************************************************************
 
template<typename EvalT, typename Traits> 
panzer_stk::GatherFields<EvalT, Traits>::
  GatherFields(const Teuchos::RCP<const STK_Interface> & mesh,const Teuchos::ParameterList& p)
{ 
  using panzer::Cell;
  using panzer::NODE;
 
  mesh_ = mesh;
 
  const std::vector<std::string>& names = 
    *(p.get< Teuchos::RCP< std::vector<std::string> > >("Field Names"));
 
  Teuchos::RCP<panzer::BasisIRLayout> basis = 
    p.get< Teuchos::RCP<panzer::BasisIRLayout> >("Basis");
  isConstant_ = basis->getBasis()->getElementSpace()==panzer::PureBasis::CONST;
 
  gatherFields_.resize(names.size());
  stkFields_.resize(names.size());
  for (std::size_t fd = 0; fd < names.size(); ++fd) {
    gatherFields_[fd] = 
      PHX::MDField<ScalarT,Cell,NODE>(names[fd],basis->functional);
    this->addEvaluatedField(gatherFields_[fd]);
  }
 
  this->setName("Gather STK Fields");
}
 
// **********************************************************************
template<typename EvalT, typename Traits> 
void panzer_stk::GatherFields<EvalT, Traits>::
postRegistrationSetup(typename Traits::SetupData /* d */, 
          PHX::FieldManager<Traits>& /* fm */)
{
  for (std::size_t fd = 0; fd < gatherFields_.size(); ++fd) {
    std::string fieldName = gatherFields_[fd].fieldTag().name();
 
    stkFields_[fd] = mesh_->getMetaData()->get_field<double>(stk::topology::NODE_RANK, fieldName);
 
    if(stkFields_[fd]==0) {
      std::stringstream ss; 
      mesh_->printMetaData(ss);
      TEUCHOS_TEST_FOR_EXCEPTION(true,std::invalid_argument,
                                 "panzer_stk::GatherFields: STK field " << "\"" << fieldName << "\" " 
                                 "not found.\n STK meta data follows: \n\n" << ss.str());
    }
  }
}
 
// **********************************************************************
template<typename EvalT, typename Traits> 
void panzer_stk::GatherFields<EvalT, Traits>::
evaluateFields(typename Traits::EvalData workset)
{ 
   const std::vector<stk::mesh::Entity> & localElements = *mesh_->getElementsOrderedByLID();
 
   // for convenience pull out some objects from workset
   const std::vector<std::size_t> & localCellIds = this->wda(workset).cell_local_ids;
 
  // loop over the fields to be gathered
  for (std::size_t fieldIndex=0; fieldIndex<gatherFields_.size();fieldIndex++) {
     VariableField * field = stkFields_[fieldIndex];
 
     auto field_view_d = gatherFields_[fieldIndex].get_static_view();
     auto field_view_h = Kokkos::create_mirror_view(field_view_d);
     Kokkos::deep_copy(field_view_h, field_view_d);
 
     std::size_t basisCnt = field_view_h.extent(1);
 
     // gather operation for each cell in workset
     for(std::size_t worksetCellIndex=0;worksetCellIndex<localCellIds.size();++worksetCellIndex) {
        std::size_t cellLocalId = localCellIds[worksetCellIndex];
        stk::mesh::Entity const* relations = mesh_->getBulkData()->begin_nodes(localElements[cellLocalId]);
 
         if(isConstant_) {
           // loop over basis functions and fill the fields
           field_view_h(worksetCellIndex,0) = *stk::mesh::field_data(*field, localElements[cellLocalId]);
         }
         else {
           // loop over basis functions and fill the fields
           for(std::size_t basis=0;basis<basisCnt;basis++) {
              stk::mesh::Entity node = relations[basis];
              field_view_h(worksetCellIndex,basis) = *stk::mesh::field_data(*field, node);
           }
         }
      }
      Kokkos::deep_copy(field_view_d, field_view_h);
   }
}
 
#endif