Schema_Backward_Differentiation_base.cpp

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#include <Schema_Backward_Differentiation_base.h>
 
#include <Equation_base.h>
#include <Navier_Stokes_std.h>
#include <Probleme_base.h>
#include <Probleme_Couple.h>
#include <Milieu_base.h>
#include <Param.h>
 
#include <communications.h>
#include <Matrice_Morse.h>
 
Implemente_base(Schema_Backward_Differentiation_base,"Schema_Backward_Differentiation_base",Schema_Implicite_Multi_TimeStep_base);
 
 
/*! @brief Simple call to Schema_Temps_base::printOn(Sortie&). Writes the time scheme to an output stream.
 *
 * @param s The output stream.
 * @return The modified output stream.
 */
Sortie& Schema_Backward_Differentiation_base::printOn(Sortie& s) const
{
  return  Schema_Implicite_Multi_TimeStep_base::printOn(s);
}
 
 
/*! @brief Reads the time scheme from an input stream.
 *
 * Simple call to Schema_Temps_base::readOn(Entree&).
 *
 * @param s The input stream.
 * @return The modified input stream.
 */
Entree& Schema_Backward_Differentiation_base::readOn(Entree& s)
{
  return Schema_Implicite_Multi_TimeStep_base::readOn(s);
}
 
double Schema_Backward_Differentiation_base::changer_temps(Equation_base& eqn, const double temps)
{
  eqn.inconnue().Champ_base::changer_temps(temps);
  return temps;
}
 
void Schema_Backward_Differentiation_base::update_time_derivative(Equation_base& eqn, const DoubleTab& data)
{
  //Nothing to do
}
 
void Schema_Backward_Differentiation_base::mettre_a_jour_equation(Equation_base& eqn, const double temps)
{
  eqn.inconnue().mettre_a_jour(temps);
}
 
void Schema_Backward_Differentiation_base::compute_coefficients(double time_step, const DoubleTab& times) const
{
  compute_backward_differentiation_coefficients(time_step,times);
}
 
//To take into account pressure constraint
void Schema_Backward_Differentiation_base::store_equation_parameters(Equation_base& eqn, DoubleTab& stored_parameters)
{
  if (nb_pas_dt()>nb_pas_dt_seuil())
    {
      if (sub_type(Navier_Stokes_std,eqn))
        {
          Navier_Stokes_std& navier_stokes = ref_cast(Navier_Stokes_std,eqn);
          stored_parameters = navier_stokes.pression().valeurs(); //store pressure at time tn
        }
    }
}
 
//To take into account pressure constraint
void Schema_Backward_Differentiation_base::modify_equation_parameters(Equation_base& eqn, DoubleTab& stored_parameters)
{
  if (nb_pas_dt()>nb_pas_dt_seuil())
    {
      if (sub_type(Navier_Stokes_std,eqn))
        {
          Navier_Stokes_std& navier_stokes = ref_cast(Navier_Stokes_std,eqn);
 
          DoubleTab& pressure = navier_stokes.pression().valeurs(); //pressure at time tnplus1 that is to say P(n+1)
          DoubleTab  delta_pressure(pressure);
 
          delta_pressure -= stored_parameters; //contains P(n+1) - P(n)
          delta_pressure /= coefficients()[nb_valeurs_passees()+1]; //take into account time scheme coefficient
          pressure        = stored_parameters;
          pressure       += delta_pressure;
        }
    }
}
 
void Schema_Backward_Differentiation_base::add_multi_timestep_data(const Equation_base& eqn, Matrice_Base& mat_morse, DoubleTab& secmem) const
{
  double time_step               =  pas_de_temps();
  double effective_time_step     = -1.;
 
  // Remark for "pen" interger : we do not penalize matrices and right members even in the case
  // of Dirichlet or Symetrie boundary conditions
  int pen    = 0;
  int offset = 0;
  int i      = 0;
 
  effective_time_step     = coefficients()[nb_valeurs_passees()+1] * time_step;
 
  //Modification due to present time and past times
  DoubleTab dudt(eqn.inconnue().valeurs());
  DoubleTab tmp(dudt);
 
  dudt = 0.;
  for (i=0; i<nb_valeurs_passees()+1; ++i)
    {
      offset  = nb_valeurs_passees()-i + 1;//due to Initialiser_Champs() offset
      tmp     = eqn.inconnue().passe(offset);
      tmp    *= coefficients()[i] ;
      dudt   += tmp; //past times and present time if i==nb_valeurs_passees()
    }
 
  eqn.solv_masse().ajouter_masse(effective_time_step,secmem,dudt,pen);
  eqn.solv_masse().ajouter_masse(effective_time_step,mat_morse,pen);
}