initial.C

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2019 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 "initial.h"
 
using namespace libMesh;
 
void read_initial_parameters()
{
}
 
void finish_initialization()
{
}
 
 
 
// Initial conditions
Number initial_value(const Point & p,
                     const Parameters &,
                     const std::string &,
                     const std::string &)
{
  Real x = p(0), y = p(1);
 
  return sin(M_PI * x) * sin(M_PI * y);
}
 
 
 
Gradient initial_grad(const Point & p,
                      const Parameters &,
                      const std::string &,
                      const std::string &)
{
  Real x = p(0), y = p(1);
 
  return Gradient(Number(M_PI*cos(M_PI * x) * sin(M_PI * y)),
                  Number(M_PI*sin(M_PI * x) * cos(M_PI * y)));
}