Paroi_UTAU_IMP_Impl.cpp

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#include <Paroi_UTAU_IMP_Impl.h>
#include <Champ_Don_base.h>
#include <Motcle.h>
 
Entree& Paroi_UTAU_IMP_Impl::lire_donnees(Entree& s)
{
  // Definition des mots-cles
  Motcles les_mots(3);
  les_mots[0] = "u_tau";
  les_mots[1] = "lambda_c";
  les_mots[2] = "diam_hydr";
 
  u_star_ok = 0;
  lambda_c_ok = 0;
  int diam_ok = 0;
 
  // Lecture et interpretation
  Motcle motlu, accolade_fermee="}", accolade_ouverte="{";
  s >> motlu;
  if(motlu == accolade_ouverte)
    {
      // on passe l'accolade ouvrante
      s >> motlu;
    }
  while (motlu != accolade_fermee)
    {
      int rang=les_mots.search(motlu);
      switch(rang)
        {
        case 0 :   // u_star expression
          {
            u_star_ok = 1;
            s >> u_star;
            break;
          }
        case 1 :   // lambda_c expression
          {
            lambda_c_ok=1;
            Nom tmp;
            s >> tmp;
            Cerr << "Lecture et interpretation de la fonction " << tmp << " ... ";
            lambda_c.setNbVar(2+Objet_U::dimension);
            lambda_c.setString(tmp);
            lambda_c.addVar("x");
            if (Objet_U::dimension>1)
              lambda_c.addVar("y");
            if (Objet_U::dimension>2)
              lambda_c.addVar("z");
            lambda_c.addVar("Re");
            lambda_c.addVar("Dh");
            lambda_c.parseString();
            break;
          }
        case 2: // diam_hydr
          diam_ok = 1;
          s >> diam_hydr;
          break;
        default : // non compris
          Cerr << "Mot cle \"" << motlu << "\" non compris lors de la lecture d'un Paroi_UTAU_Impose" << finl;
          Process::exit();
        }
      s >> motlu;
    }
 
  if ((u_star_ok == 0) && (lambda_c_ok == 0))
    {
      Cerr << "Il faut definir le champ u_star a une composante ou lambda_c=f(Re,Dh,x,y,z)" << finl;
      Process::exit();
    }
 
  if (u_star_ok == 1)
    if (u_star->nb_comp()!=1)
      {
        Cerr << "Il faut definir le champ u_star a une composante" << finl;
        Process::exit();
      }
 
  if ((lambda_c_ok == 1) && (diam_ok == 0))
    {
      Cerr << "Il faut definir le diametre hydraulique si vous definissez lambda_c" << finl;
      Process::exit();
 
    }
  return s;
}
 
double Paroi_UTAU_IMP_Impl::calculer_utau(const DoubleVect& pos, double norm_v, double d_visco)
{
  if (u_star_ok == 1)
    {
      return u_star->valeur_a_compo(pos,0);
    }
  else
    {
      double dh = diam_hydr->valeur_a_compo(pos,0);
      double reynolds=norm_v*dh/d_visco;
 
      for (int i=0; i<Objet_U::dimension; i++)
        {
          lambda_c.setVar(i,pos[i]);
        }
      lambda_c.setVar("Re",reynolds);
      lambda_c.setVar("Dh",dh);
      double lambda = lambda_c.eval();
      return norm_v*sqrt(lambda/8.);
    }
}