Pred_Cor.cpp

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#include <Domaine_Cl_dis_base.h>
#include <Operateur_Conv.h>
#include <Pred_Cor.h>
 
Implemente_instanciable(Pred_Cor,"Schema_Predictor_Corrector",Schema_Temps_base);
// XD schema_predictor_corrector schema_temps_base schema_predictor_corrector INHERITS_BRACE This is the
// XD_CONT predictor-corrector scheme (second order). It is more accurate and economic than MacCormack scheme. It gives
// XD_CONT best results with a second ordre convective scheme like quick, centre (VDF).
 
Sortie& Pred_Cor::printOn(Sortie& s) const
{
  return  Schema_Temps_base::printOn(s);
}
 
Entree& Pred_Cor::readOn(Entree& s)
{
  return Schema_Temps_base::readOn(s) ;
}
 
 
////////////////////////////////
//                            //
// Schema characteristics     //
//                            //
////////////////////////////////
 
 
/*! @brief Returns the number of temporal values to keep.
 *
 * Here: n and n+1, so 2.
 *
 */
int Pred_Cor::nb_valeurs_temporelles() const
{
  return 2 ;
}
 
/*! @brief Returns the number of future temporal values.
 *
 * Here: n+1, so 1.
 *
 */
int Pred_Cor::nb_valeurs_futures() const
{
  return 1 ;
}
 
/*! @brief Returns the time at the i-th future value.
 *
 * Here: t(n+1)
 *
 */
double Pred_Cor::temps_futur(int i) const
{
  assert(i==1);
  return temps_courant()+pas_de_temps();
}
 
/*! @brief Returns the time that fields must return when valeurs() is called.
 *
 *     Here: t(n+1)
 *
 */
double Pred_Cor::temps_defaut() const
{
  return temps_courant()+pas_de_temps();
}
 
/////////////////////////////////////////
//                                     //
// End of schema characteristics       //
//                                     //
/////////////////////////////////////////
 
 
int Pred_Cor::faire_un_pas_de_temps_eqn_base(Equation_base& eqn)
{
  DoubleTab& xi=eqn.inconnue().valeurs();
  DoubleTab& xipls1=eqn.inconnue().futur();
 
  DoubleTab dudt(xi);
 
  // PREDICTOR step
 
  eqn.domaine_Cl_dis().imposer_cond_lim(eqn.inconnue(),temps_courant()+pas_de_temps());
 
  // Advance the wheel so that operators use the fields at the future time
  eqn.inconnue().avancer();
  eqn.derivee_en_temps_inco(dudt);
 
  // Xi+1=Xi+dt_*dX/dt(Xi)
  xipls1 = dudt;
  xipls1 *= dt_;
  xipls1 += xi;
 
  xipls1.echange_espace_virtuel();
 
  // CORRECTOR step
  DoubleTab dudtpls1(xipls1);
  eqn.derivee_en_temps_inco(dudtpls1);
  eqn.inconnue().reculer();
 
  dudtpls1 += dudt;
  dudtpls1 *= 0.5;
 
  // Xi+1=Xi+dt_*0.5*(dX/dt(Xi)+dX/dt(Xi+1))
  xipls1  = dudtpls1 ;
  xipls1  *= dt_;
  xipls1  += xi ;
 
  eqn.domaine_Cl_dis().imposer_cond_lim(eqn.inconnue(),temps_courant()+pas_de_temps());
  update_critere_statio(dudtpls1, eqn);
 
  return 1;
}