Champ_front_bruite.cpp

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#include <Champ_front_bruite.h>
#include <Frontiere_dis_base.h>
#include <Frontiere.h>
#include <Motcle.h>
 
Implemente_instanciable(Champ_front_bruite,"Champ_front_bruite",Ch_front_var_instationnaire_indep);
// XD champ_front_bruite front_field_base champ_front_bruite NO_BRACE Field which is variable in time and space in a
// XD_CONT random manner.
// XD attr nb_comp entier nb_comp REQ Number of field components.
// XD attr bloc bloc_lecture bloc REQ { [N val L val ] Moyenne m_1.....[m_i ] Amplitude A_1.....[A_ i ]}: Random nois:
// XD_CONT If N and L are not defined, the ith component of the field varies randomly around an average value m_i with a
// XD_CONT maximum amplitude A_i. NL2 White noise: If N and L are defined, these two additional parameters correspond to
// XD_CONT L, the domain length and N, the number of nodes in the domain. Noise frequency will be between 2*Pi/L and
// XD_CONT 2*Pi*N/(4*L). NL2 For example, formula for velocity: u=U0(t) v=U1(t)Uj(t)=Mj+2*Aj*bruit_blanc where
// XD_CONT bruit_blanc (white_noise) is the formula given in the mettre_a_jour (update) method of the Champ_front_bruite
// XD_CONT (noise_boundary_field) (Refer to the Champ_front_bruite.cpp file).
 
/*! @brief Impression sur un flot de sortie au format: taille
 *
 *     valeur(0) ... valeur(i)  ... valeur(taille-1)
 *
 * @param (Sortie& os) un flot de sortie
 * @return (Sortie&) le flot de sortie modifie
 */
Sortie& Champ_front_bruite::printOn(Sortie& os) const
{
  const DoubleTab& tab=valeurs();
  os << tab.size() << " ";
  for(int i=0; i<tab.size(); i++)
    os << tab(0,i);
  return os;
}
 
/*! @brief Lecture a partir d'un flot d'entree au format: nombre_de_composantes
 *
 *     moyenne moyenne(0) ... moyenne(nombre_de_composantes-1)
 *     moyenne amplitude(0) ... amplitude(nombre_de_composantes-1)
 *
 * @param (Entree& is) un flot d'entree
 * @return (Entree&) le flot d'entree modifie
 * @throws accolade ouvrante attendue
 * @throws mot clef inconnu a cet endroit
 * @throws accolade fermante attendue
 */
Entree& Champ_front_bruite::readOn(Entree& is)
{
  int dim;
  dim=lire_dimension(is,que_suis_je());
  Motcle motlu;
  Motcles les_mots(4);
  les_mots[0]="moyenne";
  les_mots[1]="amplitude";
  les_mots[2]="L";
  les_mots[3]="N";
  is >> motlu;
  if (motlu != "{")
    {
      Cerr << "Error while reading a Champ_front_bruite" << finl;
      Cerr << "We expected a { instead of " << motlu << finl;
      exit();
    }
  is >> motlu;
  while (motlu!="}")
    {
      int rang=les_mots.search(motlu);
      switch(rang)
        {
        case 0 :
          {
            moyenne.resize(dim);
            fixer_nb_comp(dim);
            for(int i=0; i<dim; i++)
              is >> moyenne(i);
            break;
          }
        case 1:
          {
            amplitude.resize(dim);
            for(int i=0; i<dim; i++)
              is >> amplitude(i);
            break;
          }
        case 2:
          {
            is >> lx;
            break;
          }
        case 3:
          {
            is >> nx;
            break;
          }
        default :
          {
            Cerr << "Error while reading a Champ_front_bruite" << finl;
            Cerr << motlu << "is not understand here "<< finl;
            Cerr << "We were expecting a word from " << les_mots << finl;
            exit();
          }
        }
      is >> motlu;
    }
  return is;
}
 
 
/*! @brief Pas code !!
 *
 * @param (Champ_front_base& ch)
 * @return (Champ_front_base&)
 */
Champ_front_base& Champ_front_bruite::affecter_(const Champ_front_base& ch)
{
  return *this;
}
 
/*! @brief Mise a jour du temps et retirage aleatoire des valeurs du bruit.
 *
 * @param (double temps) le temps de mise a jour
 */
void Champ_front_bruite::mettre_a_jour(double temps)
{
  const Frontiere& front=la_frontiere_dis->frontiere();
  int nb_faces=front.nb_faces();
  DoubleTab& tab=valeurs_au_temps(temps);
 
  if (nx!=0)
    {
      //
      // N!=0 modelisation du bruit blanc (R. Howard)
      //
      double onde, bruit_blanc, pi, invx, d_x, tot_vel;
      pi=2.*acos(0.);
      invx=1./nx;
      d_x=lx/nx;
      for(int i=0; i<nb_faces; i++)
        for(int j=0; j<nb_comp(); j++)
          {
            tot_vel=moyenne(j)+amplitude(j);
            onde=0.;
            for (int in_x=0; in_x<nx; in_x++)
              onde=onde+sin((2.*pi*temps/(4*d_x+in_x*d_x)+(10.2*i+5.3*j))*tot_vel+5.6*pi);
 
            bruit_blanc=onde*invx;
            tab(i,j)=moyenne(j)+2.*amplitude(j)*bruit_blanc;
          }
    }
  else
    //
    // N=0 donc modelisation bruit aleatoire
    //
    for(int i=0; i<nb_faces; i++)
      for(int j=0; j<nb_comp(); j++)
        {
          tab(i,j)=moyenne(j)+amplitude(j)*(-1.+2.*drand48());
        }
  tab.echange_espace_virtuel();
}