Panzer_GatherNormals_impl.hpp

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//           Panzer: A partial differential equation assembly
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#ifndef PANZER_GATHER_NORMALS_IMPL_HPP
#define PANZER_GATHER_NORMALS_IMPL_HPP

#include "Teuchos_Assert.hpp"
#include "Phalanx_DataLayout.hpp"

#include "Panzer_PureBasis.hpp"
#include "Kokkos_ViewFactory.hpp"

#include "Intrepid2_Kernels.hpp"
#include "Intrepid2_CellTools.hpp"
#include "Intrepid2_OrientationTools.hpp"

#include "Teuchos_FancyOStream.hpp"

template<typename EvalT,typename Traits>
panzer::GatherNormals<EvalT, Traits>::
GatherNormals(
  const Teuchos::ParameterList& p)
{ 
  dof_name = (p.get< std::string >("DOF Name"));

  if(p.isType< Teuchos::RCP<PureBasis> >("Basis"))
    basis = p.get< Teuchos::RCP<PureBasis> >("Basis");
  else
    basis = p.get< Teuchos::RCP<const PureBasis> >("Basis");

  pointRule = p.get<Teuchos::RCP<const PointRule> >("Point Rule");

  Teuchos::RCP<PHX::DataLayout> basis_layout         = basis->functional;
  Teuchos::RCP<PHX::DataLayout> vector_layout_vector = basis->functional_grad;

  // some sanity checks
  TEUCHOS_ASSERT(basis->isVectorBasis());

  // setup the orientation field
  std::string orientationFieldName = basis->name() + " Orientation";
  // setup all fields to be evaluated and constructed
  pointValues = panzer::PointValues2<double> (pointRule->getName()+"_",false);
  pointValues.setupArrays(pointRule);

  // the field manager will allocate all of these field
  constJac_ = pointValues.jac;
  this->addDependentField(constJac_);

  gatherFieldNormals = PHX::MDField<ScalarT,Cell,NODE,Dim>(dof_name+"_Normals",vector_layout_vector);
  this->addEvaluatedField(gatherFieldNormals);

  this->setName("Gather Normals");
}

// **********************************************************************
template<typename EvalT,typename Traits>
void panzer::GatherNormals<EvalT, Traits>::
postRegistrationSetup(typename Traits::SetupData d, 
          PHX::FieldManager<Traits>& fm)
{
  orientations = d.orientations_;
  this->utils.setFieldData(pointValues.jac,fm);
  faceNormal = Kokkos::createDynRankView(gatherFieldNormals.get_static_view(),
           "faceNormal",
           gatherFieldNormals.extent(0),
           gatherFieldNormals.extent(1),
           gatherFieldNormals.extent(2));
}

// **********************************************************************
template<typename EvalT,typename Traits>
void panzer::GatherNormals<EvalT, Traits>::
evaluateFields(typename Traits::EvalData workset)
{ 

  if(workset.num_cells<=0)
    return;

  const shards::CellTopology & parentCell = *basis->getCellTopology();
  int cellDim = parentCell.getDimension();
  int numFaces = gatherFieldNormals.extent(1);

  // allocate space that is sized correctly for AD
  auto refEdges = Kokkos::createDynRankView(gatherFieldNormals.get_static_view(),"ref_edges", 2, cellDim);
  auto phyEdges = Kokkos::createDynRankView(gatherFieldNormals.get_static_view(),"phy_edges", 2, cellDim);

  const WorksetDetails & details = workset;
  const auto worksetJacobians = pointValues.jac.get_view();

  // Loop over workset faces and edge points
  for(index_t c=0;c<workset.num_cells;c++) {
    int faceOrts[6] = {};
    orientations->at(details.cell_local_ids[c]).getFaceOrientation(faceOrts, numFaces);

    for(int pt = 0; pt < numFaces; pt++) {
      auto ortEdgeTan_U = Kokkos::subview(refEdges, 0, Kokkos::ALL());
      auto ortEdgeTan_V = Kokkos::subview(refEdges, 1, Kokkos::ALL());

      // Apply parent cell Jacobian to ref. edge tangent
      Intrepid2::Orientation::getReferenceFaceTangents(ortEdgeTan_U,
                                                       ortEdgeTan_V,
                                                       pt,
                                                       parentCell,
                                                       faceOrts[pt]);

      auto phyEdgeTan_U = Kokkos::subview(phyEdges, 0, Kokkos::ALL());
      auto phyEdgeTan_V = Kokkos::subview(phyEdges, 1, Kokkos::ALL());
      auto J = Kokkos::subview(worksetJacobians, c, pt, Kokkos::ALL(), Kokkos::ALL());

      Intrepid2::Kernels::Serial::matvec_product(phyEdgeTan_U, J, ortEdgeTan_U);            
      Intrepid2::Kernels::Serial::matvec_product(phyEdgeTan_V, J, ortEdgeTan_V);            

      // take the cross product of the two vectors
      gatherFieldNormals(c,pt,0) = (phyEdgeTan_U(1)*phyEdgeTan_V(2) - phyEdgeTan_U(2)*phyEdgeTan_V(1));
      gatherFieldNormals(c,pt,1) = (phyEdgeTan_U(2)*phyEdgeTan_V(0) - phyEdgeTan_U(0)*phyEdgeTan_V(2));
      gatherFieldNormals(c,pt,2) = (phyEdgeTan_U(0)*phyEdgeTan_V(1) - phyEdgeTan_U(1)*phyEdgeTan_V(0));
    }
  }

}

#endif