Panzer_Normals_impl.hpp

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#ifndef PANZER_NORMALS_IMPL_HPP
#define PANZER_NORMALS_IMPL_HPP

#include <algorithm>
#include "Panzer_IntegrationRule.hpp"
#include "Panzer_Workset_Utilities.hpp"
#include "Intrepid2_FunctionSpaceTools.hpp"
#include "Intrepid2_CellTools.hpp"

namespace panzer {

//**********************************************************************
template<typename EvalT, typename Traits>
Normals<EvalT, Traits>::
Normals(
  const Teuchos::ParameterList& p)
   : normalize(true)
{
  // Read from parameters
  const std::string name = p.get<std::string>("Name");
  side_id = p.get<int>("Side ID");
  Teuchos::RCP<panzer::IntegrationRule> quadRule
     = p.get< Teuchos::RCP<panzer::IntegrationRule> >("IR");
  if(p.isParameter("Normalize")) // set default
     normalize = p.get<bool>("Normalize");

  // grab information from quadrature rule
  Teuchos::RCP<PHX::DataLayout> vector_dl = quadRule->dl_vector;
  quad_order = quadRule->cubature_degree;

  // build field, set as evaluated type
  normals = PHX::MDField<ScalarT,Cell,Point,Dim>(name, vector_dl);
  this->addEvaluatedField(normals);
  
  std::string n = "Normals: " + name;
  this->setName(n);
}

//**********************************************************************
template<typename EvalT, typename Traits>
void
Normals<EvalT, Traits>::
postRegistrationSetup(
  typename Traits::SetupData sd,
  PHX::FieldManager<Traits>& /* fm */)
{
  num_qp  = normals.extent(1);
  num_dim = normals.extent(2);
  
  quad_index =  panzer::getIntegrationRuleIndex(quad_order,(*sd.worksets_)[0], this->wda);
}

//**********************************************************************
template<typename EvalT, typename Traits>
void
Normals<EvalT, Traits>::
evaluateFields(
  typename Traits::EvalData workset)
{ 
  // ECC Fix: Get Physical Side Normals

  if(workset.num_cells>0) {
    Intrepid2::CellTools<PHX::exec_space>::getPhysicalSideNormals(normals.get_view(),
                                                                  this->wda(workset).int_rules[quad_index]->jac.get_view(),
                                                                  side_id, *this->wda(workset).int_rules[quad_index]->int_rule->topology);
      
    if(normalize) {
      // normalize vector: getPhysicalSideNormals does not 
      // return normalized vectors
      for(index_t c=0;c<workset.num_cells;c++) {
        for(std::size_t q=0;q<num_qp;q++) {
          ScalarT norm = 0.0;
   
          // compute squared norm
          for(std::size_t d=0;d<num_dim;d++)
            norm += normals(c,q,d)*normals(c,q,d);
    
          // adjust for length of vector, now unit vectors
          norm = sqrt(norm);
          for(std::size_t d=0;d<num_dim;d++)
            normals(c,q,d) /= norm;
        }
      }
    }
    // else normals correspond to differential
  }
}

//**********************************************************************

}

#endif