Neumann.cpp

/****************************************************************************
* Copyright (c) 2025, CEA
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
 
#include <Frontiere_dis_base.h>
#include <Front_VF.h>
#include <Neumann.h>
 
Implemente_base(Neumann, "Neumann", Cond_lim_base);
// XD neumann condlim_base neumann INHERITS_BRACE Neumann condition at the boundary called bord (edge) : 1). For
// XD_CONT Navier-Stokes equations, constraint imposed at the boundary; 2). For scalar transport equation, flux imposed
// XD_CONT at the boundary.
 
Sortie& Neumann::printOn(Sortie& s) const { return s << que_suis_je() << finl; }
 
Entree& Neumann::readOn(Entree& s) { return Cond_lim_base::readOn(s); }
 
/*! @brief Returns the value of the imposed flux on the i-th component of the field representing the flux at the boundary.
 *
 * @param (int i) index along the first dimension of the field
 * @return (double) the imposed value on the specified field component
 * @throws second dimension of the boundary field greater than 1
 */
double Neumann::flux_impose(int i) const
{
  if (le_champ_front->valeurs().size() == 1)
    return le_champ_front->valeurs()(0, 0);
  else if (le_champ_front->valeurs().dimension(1) == 1)
    return le_champ_front->valeurs()(i, 0);
  else
    Cerr << "Neumann::flux_impose error" << finl;
  Process::exit();
  return 0.;
}
 
/*! @brief Returns the value of the imposed flux on the (i,j)-th component of the field representing the flux at the boundary.
 *
 * @param (int i) index along the first dimension of the field
 * @param (int j) index along the second dimension of the field
 * @return (double) the imposed value on the specified field component
 */
double Neumann::flux_impose(int i, int j) const
{
  if (le_champ_front->valeurs().dimension(0) == 1)
    return le_champ_front->valeurs()(0, j);
  else
    return le_champ_front->valeurs()(i, j);
}
 
/*! @brief Updates and returns the imposed flux array.
 *
 * This function checks the total number of faces in the boundary and resizes the
 * `flux_impose_` array if necessary. It updates the values based on the imposed
 * flux from the front field if the field is unsteady or if the dimensions have changed.
 *
 * @return const DoubleTab& Reference to the updated imposed flux array.
 */
const DoubleTab& Neumann::flux_impose(bool with_virtual_faces) const
{
  const Front_VF& le_bord = ref_cast(Front_VF, frontiere_dis());
  // ToDo factorize in Champ_front_base::valeurs_face()
  int size;
  if (with_virtual_faces)
    size = le_champ_front->valeurs().dimension(0) == 1 ? le_bord.nb_faces_tot() : le_champ_front->valeurs().dimension_tot(0);
  else
    size = le_champ_front->valeurs().dimension(0) == 1 ? le_bord.nb_faces() : le_champ_front->valeurs().dimension(0);
 
  if (size>0)
    {
      bool update = le_champ_front->instationnaire();
      if (flux_impose_.dimension(0) != size)
        {
          int nb_comp = le_champ_front->valeurs().nb_dim() == 1 ? 1 : le_champ_front->valeurs().dimension(1);
          flux_impose_.resize(size, nb_comp);
          update = true;
        }
      update = true; // Provisoire (ecarts sur Quasi_Comp_Obst_GP_VEF_Pmoy ???)
      if (update)
        {
          int nb_comp = flux_impose_.dimension(1);
          for (int i = 0; i < size; i++)
            for (int j = 0; j < nb_comp; j++)
              flux_impose_(i, j) = flux_impose(i, j);
        }
    }
  return flux_impose_;
}