dtk_evaluator.C

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2026 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
#include "libmesh/libmesh_config.h"
 
#ifdef LIBMESH_TRILINOS_HAVE_DTK
 
#include "libmesh/dtk_evaluator.h"
 
#include "libmesh/dof_map.h"
#include "libmesh/fe_interface.h"
#include "libmesh/fe_compute_data.h"
#include "libmesh/numeric_vector.h"
#include "libmesh/equation_systems.h"
#include "libmesh/system.h"
 
namespace libMesh
{
 
DTKEvaluator::DTKEvaluator(System & in_sys,
                           std::string var_name):
  sys(in_sys),
  current_local_solution(*sys.current_local_solution),
  es(in_sys.get_equation_systems()),
  mesh(sys.get_mesh()),
  dim(mesh.mesh_dimension()),
  dof_map(sys.get_dof_map()),
  var_num(sys.variable_number(var_name)),
  fe_type(dof_map.variable_type(var_num))
{}
 
DTKEvaluator::FieldContainerType
DTKEvaluator::evaluate(const Teuchos::ArrayRCP<int> & elements,
                       const Teuchos::ArrayRCP<double> & coords)
{
  unsigned int num_values = elements.size();
 
  Teuchos::ArrayRCP<Number> values(num_values);
  DataTransferKit::FieldContainer<Number> evaluations(values, 1);
 
  for (unsigned int i=0; i<num_values; i++)
    {
      Elem * elem = mesh.elem_ptr(elements[i]);
 
      Point p;
 
      for (unsigned int j=0; j<dim; j++)
        p(j) = coords[(j*num_values)+i];
 
      const Point mapped_point(FEMap::inverse_map(dim, elem, p));
 
      FEComputeData data (es, mapped_point);
      FEInterface::compute_data (dim, fe_type, elem, data);
 
      std::vector<dof_id_type> dof_indices;
      dof_map.dof_indices(elem, dof_indices, var_num);
 
      Number value = 0;
 
      for (auto j : index_range(dof_indices))
        value += current_local_solution(dof_indices[j]) * data.shape[j];
 
      values[i] = value;
    }
 
  return evaluations;
}
 
} // namespace libMesh
 
#endif