Panzer_CrossProduct_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_EVALUATOR_CrossProduct_IMPL_HPP
#define PANZER_EVALUATOR_CrossProduct_IMPL_HPP
 
#include <string>
 
#include "Panzer_PointRule.hpp"
#include "Panzer_Workset_Utilities.hpp"
#include "Panzer_HierarchicParallelism.hpp"
 
#include "Teuchos_RCP.hpp"
 
namespace panzer {
 
//**********************************************************************
template<typename EvalT, typename Traits>
CrossProduct<EvalT, Traits>::
CrossProduct(
  const Teuchos::ParameterList& p)
{
  std::string result_name = p.get<std::string>("Result Name");
  std::string vec_a_name = p.get<std::string>("Vector A Name");
  std::string vec_b_name = p.get<std::string>("Vector B Name");
  
  const Teuchos::RCP<const panzer::PointRule> pr = 
    p.get< Teuchos::RCP<const panzer::PointRule> >("Point Rule");
 
  // use a scalar field only if dimension is 2D
  useScalarField = (pr->spatial_dimension==2);
 
  if(!useScalarField)
    vec_a_cross_vec_b = PHX::MDField<ScalarT>(result_name, pr->dl_vector);
  else 
    vec_a_cross_vec_b = PHX::MDField<ScalarT>(result_name, pr->dl_scalar);
 
  vec_a = PHX::MDField<const ScalarT>(vec_a_name, pr->dl_vector);
  vec_b = PHX::MDField<const ScalarT>(vec_b_name, pr->dl_vector);
 
  this->addEvaluatedField(vec_a_cross_vec_b);
  this->addDependentField(vec_a);
  this->addDependentField(vec_b);
 
  std::string n = "CrossProduct: " + result_name + " = " + vec_a_name + " . " + vec_b_name;
  this->setName(n);
}
 
//**********************************************************************
template<typename EvalT, typename Traits>
void
CrossProduct<EvalT, Traits>::
postRegistrationSetup(
  typename Traits::SetupData /* sd */,
  PHX::FieldManager<Traits>& /* fm */)
{
  num_pts = vec_a.extent(1);
  num_dim = vec_a.extent(2);
 
  TEUCHOS_ASSERT(vec_a.extent(1) == vec_b.extent(1));
  TEUCHOS_ASSERT(vec_a.extent(2) == vec_b.extent(2));
}
 
//**********************************************************************
template<typename EvalT, typename Traits>
void
CrossProduct<EvalT, Traits>::
evaluateFields(
  typename Traits::EvalData workset)
{ 
  auto a = vec_a.get_static_view();
  auto b = vec_b.get_static_view();
  auto a_cross_b = vec_a_cross_vec_b.get_static_view();
  const int l_num_pts = num_pts;
 
  auto policy = panzer::HP::inst().teamPolicy<ScalarT,PHX::ExecutionSpace>(workset.num_cells);
 
  if(useScalarField) {
    Kokkos::parallel_for("panzer::CrossProduct 2D",policy,KOKKOS_LAMBDA (const Kokkos::TeamPolicy<PHX::ExecutionSpace>::member_type& team) {
      const int cell = team.league_rank();
      Kokkos::parallel_for(Kokkos::TeamThreadRange(team,0,l_num_pts), [&] (const int p) {
        a_cross_b(cell,p) = a(cell,p,0)*b(cell,p,1)-a(cell,p,1)*b(cell,p,0);
      });
    });
  }
  else {
    Kokkos::parallel_for("panzer::CrossProduct 3D",policy,KOKKOS_LAMBDA (const Kokkos::TeamPolicy<PHX::ExecutionSpace>::member_type& team) {
      const int cell = team.league_rank();
      Kokkos::parallel_for(Kokkos::TeamThreadRange(team,0,l_num_pts), [&] (const int p) {
        a_cross_b(cell,p,0) =   a(cell,p,1)*b(cell,p,2)-a(cell,p,2)*b(cell,p,1);
        a_cross_b(cell,p,1) = -(a(cell,p,0)*b(cell,p,2)-a(cell,p,2)*b(cell,p,0));
        a_cross_b(cell,p,2) =   a(cell,p,0)*b(cell,p,1)-a(cell,p,1)*b(cell,p,0);
      });
    });
  }
}
 
//**********************************************************************
 
}
 
#endif