exact_solution.hpp

/******************************************************************************
 * Copyright (C) Siarhei Uzunbajakau, 2023.
 *
 * This program is free software. You can use, modify, and redistribute it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 or (at your option) any later version.
 * This program is distributed without any warranty.
 *
 * Refer to COPYING.LESSER for more details.
 ******************************************************************************/
 
#ifndef ExactSolutionFLC_H__
#define ExactSolutionFLC_H__
 
#include "constants.hpp"
#include "settings.hpp"
#include <deal.II/base/function.h>
 
using namespace dealii;
 
template<int dim>
class ExactSolutionFLC_PHI
  : public Function<dim>
  , public SettingsFLC
{
public:
  ExactSolutionFLC_PHI();
 
  virtual double value(const Point<dim>& r,
                       const unsigned int component = 0) const override final;
 
  virtual Tensor<1, dim> gradient(
    const Point<dim>& r,
    const unsigned int component = 0) const override final;
 
private:
  double alpha;
  double beta;
  double phi_d;
};
 
#endif