explicit.h

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/**********************************************************************
 *  Copyright (C) 2011 - 2014 by the authors
 *  Distributed under the MIT License
 *
 * See the files AUTHORS and LICENSE in the project root directory
 *
 **********************************************************************/

#ifndef __brusselator_explicit_h
#define __brusselator_explicit_h

#include <amandus/brusselator/implicit.h>
#include <amandus/brusselator/parameters.h>
#include <amandus/integrator.h>
#include <deal.II/base/polynomial.h>
#include <deal.II/base/tensor.h>
#include <deal.II/integrators/divergence.h>
#include <deal.II/integrators/l2.h>
#include <deal.II/integrators/laplace.h>

using namespace dealii;
using namespace LocalIntegrators;
using namespace MeshWorker;

namespace Brusselator
{
template <int dim>
class ExplicitResidual : public AmandusIntegrator<dim>
{
public:
  ExplicitResidual(const Parameters& par);

  virtual void cell(DoFInfo<dim>& dinfo, IntegrationInfo<dim>& info) const;
  virtual void boundary(DoFInfo<dim>& dinfo, IntegrationInfo<dim>& info) const;
  virtual void face(DoFInfo<dim>& dinfo1, DoFInfo<dim>& dinfo2, IntegrationInfo<dim>& info1,
                    IntegrationInfo<dim>& info2) const;

private:
  SmartPointer<const Parameters, class ImplicitResidual<dim>> parameters;
};

//----------------------------------------------------------------------//

template <int dim>
ExplicitResidual<dim>::ExplicitResidual(const Parameters& par)
  : parameters(&par)
{
  this->use_boundary = false;
  this->use_face = true;
}

template <int dim>
void
ExplicitResidual<dim>::cell(DoFInfo<dim>& dinfo, IntegrationInfo<dim>& info) const
{
  Assert(this->timestep != 0, ExcMessage("Only for transient problems"));
  Assert(info.values.size() >= 1, ExcDimensionMismatch(info.values.size(), 1));
  Assert(info.gradients.size() >= 1, ExcDimensionMismatch(info.values.size(), 1));

  std::vector<double> rhs0(info.fe_values(0).n_quadrature_points, 0.);
  std::vector<double> rhs1(info.fe_values(0).n_quadrature_points, 0.);

  for (unsigned int k = 0; k < info.fe_values(0).n_quadrature_points; ++k)
  {
    const double u = info.values[0][0][k];
    const double v = info.values[0][1][k];
    rhs0[k] = u - this->timestep * (-parameters->B - u * u * v + (parameters->A + 1.) * u);
    rhs1[k] = v - this->timestep * (-parameters->A * u + u * u * v);
  }

  L2::L2(dinfo.vector(0).block(0), info.fe_values(0), rhs0);
  L2::L2(dinfo.vector(0).block(1), info.fe_values(0), rhs1);
  Laplace::cell_residual(dinfo.vector(0).block(0),
                         info.fe_values(0),
                         info.gradients[0][0],
                         -parameters->alpha0 * this->timestep);
  Laplace::cell_residual(dinfo.vector(0).block(1),
                         info.fe_values(0),
                         info.gradients[0][1],
                         -parameters->alpha1 * this->timestep);
}

template <int dim>
void
ExplicitResidual<dim>::boundary(DoFInfo<dim>&, IntegrationInfo<dim>&) const
{
}

template <int dim>
void
ExplicitResidual<dim>::face(DoFInfo<dim>& dinfo1, DoFInfo<dim>& dinfo2, IntegrationInfo<dim>& info1,
                            IntegrationInfo<dim>& info2) const
{
  const unsigned int deg = info1.fe_values(0).get_fe().tensor_degree();
  Laplace::ip_residual(dinfo1.vector(0).block(0),
                       dinfo2.vector(0).block(0),
                       info1.fe_values(0),
                       info2.fe_values(0),
                       info1.values[0][0],
                       info1.gradients[0][0],
                       info2.values[0][0],
                       info2.gradients[0][0],
                       Laplace::compute_penalty(dinfo1, dinfo2, deg, deg),
                       -parameters->alpha0 * this->timestep);
  Laplace::ip_residual(dinfo1.vector(0).block(1),
                       dinfo2.vector(0).block(1),
                       info1.fe_values(0),
                       info2.fe_values(0),
                       info1.values[0][1],
                       info1.gradients[0][1],
                       info2.values[0][1],
                       info2.gradients[0][1],
                       Laplace::compute_penalty(dinfo1, dinfo2, deg, deg),
                       -parameters->alpha1 * this->timestep);
}
}

#endif