Panzer_Integrator_GradBasisTimesScalar_impl.hpp

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#ifndef PANZER_EVALUATOR_GRADBASISTIMESSCALAR_IMPL_HPP
#define PANZER_EVALUATOR_GRADBASISTIMESSCALAR_IMPL_HPP
 
#include "Intrepid2_FunctionSpaceTools.hpp"
#include "Panzer_IntegrationRule.hpp"
#include "Panzer_BasisIRLayout.hpp"
#include "Panzer_Workset_Utilities.hpp"
#include "Kokkos_ViewFactory.hpp"
 
namespace panzer {
 
//**********************************************************************
template<typename EvalT, typename Traits>
Integrator_GradBasisTimesScalar<EvalT, Traits>::
Integrator_GradBasisTimesScalar(
  const Teuchos::ParameterList& p):
  _num_basis_nodes(0),
  _num_quadrature_points(0),
  _basis_index(-1)
{
 
  // TODO: Get all of the panzer modules to read in const integration rules and basisIRlayouts
  Teuchos::RCP<const BasisIRLayout> basis_layout = p.get< Teuchos::RCP<BasisIRLayout> >("Basis").getConst();
  Teuchos::RCP<const panzer::IntegrationRule> ir = p.get< Teuchos::RCP<panzer::IntegrationRule> >("IR").getConst();
  _num_dims = ir->dl_vector->extent(2);
 
  Teuchos::RCP<const PureBasis> basis = basis_layout->getBasis();
  _basis_name = basis_layout->name();
 
  // Verify that this basis supports the gradient operation
  TEUCHOS_TEST_FOR_EXCEPTION(!basis->supportsGrad(),std::logic_error,"Integrator_GradBasisTimesScalar: Basis of type \"" << basis->name() << "\" does not support GRAD");
 
  // Setup residuals
  _residuals.clear();
  if (p.isType<Teuchos::RCP<const std::vector<std::string> > >("Residual Names")){
    const std::vector<std::string> & names = *(p.get<Teuchos::RCP<const std::vector<std::string> > >("Residual Names"));
    for(const auto & name : names){
      PHX::MDField<ScalarT,Cell,BASIS> res(name, basis_layout->functional);
      _residuals.push_back(res);
    }
  }
 
  // Currently we only allow for vectors of length 3
  TEUCHOS_TEST_FOR_EXCEPTION(_num_dims != _residuals.size(),std::logic_error,"Number of residuals must equal number of gradient components (mesh dimensions).");
 
  // Setup vector
  _scalar = PHX::MDField<const ScalarT,Cell,IP>(p.get<std::string>("Scalar Name"), ir->dl_scalar);
 
  // Read the scalar multiplier
  _multiplier = ScalarT(p.get<double>("Multiplier"));
 
  // Setup field multipliers
  if (p.isType<Teuchos::RCP<const std::vector<std::string> > >("Field Multipliers")){
    const std::vector<std::string> & field_multiplier_names = *(p.get<Teuchos::RCP<const std::vector<std::string> > >("Field Multipliers"));
    for (const std::string & name : field_multiplier_names){
      _field_multipliers.push_back(PHX::MDField<const ScalarT,Cell,IP>(name, ir->dl_scalar));
    }
  }
 
  // Register evaluated fields
  for (auto & residual : _residuals){
    this->addEvaluatedField(residual);
  }
 
  // Register dependent fields
  this->addDependentField(_scalar);
  for (auto & field : _field_multipliers){
    this->addDependentField(field);
  }
 
  // Name the module
  this->setName("Integrator_GradBasisTimesScalar: " + _scalar.fieldTag().name());
}
 
//**********************************************************************
template<typename EvalT, typename Traits>
void
Integrator_GradBasisTimesScalar<EvalT, Traits>::
postRegistrationSetup(
  typename Traits::SetupData sd,
  PHX::FieldManager<Traits>& /* fm */)
{
  _num_basis_nodes = _residuals[0].extent(1);
  _num_quadrature_points = _scalar.extent(1);
 
  _basis_index = panzer::getBasisIndex(_basis_name, (*sd.worksets_)[0], this->wda);
 
  // TODO: figure out a clean way of cloning _vector
  _tmp = Kokkos::createDynRankView(_residuals[0].get_static_view(),"tmp",_scalar.extent(0), _num_quadrature_points);
}
 
//**********************************************************************
template<typename EvalT, typename Traits>
void
Integrator_GradBasisTimesScalar<EvalT, Traits>::
evaluateFields(
  typename Traits::EvalData workset)
{ 
 
  // Zero the residuals
  for (int i(0); i < static_cast<int>(_num_dims); ++i)
    Kokkos::deep_copy(_residuals[i].get_static_view(), ScalarT(0.0));
 
  // do a scaled copy to initialize _tmp
  for (int i=0; i < _scalar.extent_int(0); ++i)
    for (int j=0; j < _scalar.extent_int(1); ++j)
      _tmp(i,j) = _multiplier * _scalar(i,j);
 
  // Apply the field multipliers
  for(auto & field_data : _field_multipliers){
    for (index_t cell = 0; cell < workset.num_cells; ++cell) {
      for (std::size_t qp = 0; qp < _num_quadrature_points; ++qp) {
        _tmp(cell,qp) *= field_data(cell,qp);
      }
    }
  }
 
  const BasisValues2<double> & bv = *this->wda(workset).bases[_basis_index];
 
  for (index_t cell = 0; cell < workset.num_cells; ++cell){
    for (std::size_t basis = 0; basis < _num_basis_nodes; ++basis){
      for (std::size_t qp = 0; qp < _num_quadrature_points; ++qp){
        for(std::size_t dim = 0; dim < _num_dims; ++dim){
          _residuals[dim](cell,basis) += _tmp(cell,qp)*bv.weighted_grad_basis(cell,basis,qp,dim);
        }
      }
    }
  }
 
}
 
//**********************************************************************
 
}
 
#endif