Perte_Charge_Circulaire_VDF_Face.cpp

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#include <Perte_Charge_Circulaire_VDF_Face.h>
#include <Param.h>
 
Implemente_instanciable(Perte_Charge_Circulaire_VDF_Face, "Perte_Charge_Circulaire_VDF_Face", Perte_Charge_VDF_base);
 
Sortie& Perte_Charge_Circulaire_VDF_Face::printOn(Sortie& s) const { return s << que_suis_je() << finl; }
 
Entree& Perte_Charge_Circulaire_VDF_Face::readOn(Entree& s)
{
  Perte_Charge_VDF_base::readOn(s);
  if (v->nb_comp() != dimension)
    {
      Cerr << "The direction field must be defined with " << dimension << " components" << finl;
      Process::exit();
    }
  return s;
}
 
void Perte_Charge_Circulaire_VDF_Face::set_param(Param& param) const
{
  Perte_Charge_VDF_base::set_param(param);
  param.ajouter_non_std("lambda_ortho", (this), Param::REQUIRED);
  param.ajouter("diam_hydr_ortho", &diam_hydr_ortho, Param::REQUIRED);
  param.ajouter("direction", &v, Param::REQUIRED);
}
 
int Perte_Charge_Circulaire_VDF_Face::lire_motcle_non_standard(const Motcle& mot, Entree& is)
{
  if (mot == "lambda")
    {
      lambda.addVar("Re_tot");
      lambda.addVar("Re_long");
      return Perte_Charge_VDF_base::lire_motcle_non_standard(mot, is);
    }
  else if (mot == "lambda_ortho")
    {
      Nom tmp;
      is >> tmp;
      Cerr << "Reading and interpreting the function " << tmp << " ... ";
      lambda_ortho.setNbVar(3 + dimension);
      lambda_ortho.setString(tmp);
      lambda_ortho.addVar("Re_tot");
      lambda_ortho.addVar("Re_ortho");
      lambda_ortho.addVar("t");
      lambda_ortho.addVar("x");
      if (dimension > 1)
        lambda_ortho.addVar("y");
      if (dimension > 2)
        lambda_ortho.addVar("z");
      lambda_ortho.parseString();
      Cerr << " Ok" << finl;
      return 1;
    }
  else
    {
      return Perte_Charge_VDF_base::lire_motcle_non_standard(mot, is);
    }
}
 
void Perte_Charge_Circulaire_VDF_Face::coeffs_perte_charge(const DoubleVect& u, const DoubleVect& pos, double t, double norme_u, double dh, double nu, double reynolds, double& coeff_ortho,
                                                           double& coeff_long, double& u_l, DoubleVect& av_valeur) const
{
 
  // compute dh_ortho
  double dh_ortho = diam_hydr_ortho->valeur_a_compo(pos, 0);
 
  // compute u.d/||d||
  // Compute v and ||v||^2
  av_valeur.resize(dimension);
 
  v->valeur_a(pos, av_valeur);
  // normalize v
  {
    double vcarre = 0;
    for (int dim = 0; dim < dimension; dim++)
      vcarre += av_valeur[dim] * av_valeur[dim];
    av_valeur /= sqrt(vcarre);
  }
  // Compute u.v/||v||
  u_l = 0;
 
  for (int dim = 0; dim < dimension; dim++)
    u_l += u[dim] * av_valeur[dim];
 
  double u_ortho = sqrt(norme_u * norme_u - u_l * u_l);
  // compute Re_l and Re_ortho
  // Compute Reynolds number
  /* PL: To avoid a possible division by zero, we replace:
   double nu=norme_u*dh/reynolds;
   double Re_l=std::fabs(u_l)*dh/nu; */
  // By:
  double Re_l = dh * std::fabs(u_l) / nu;
  if (Re_l < 1e-10)
    Re_l = 1e-10;
  // PL: To avoid a possible division by zero, we replace:
  /* double Re_ortho=u_ortho*dh_ortho/nu; */
  // By:
  double Re_ortho = dh_ortho * u_ortho / nu;
  if (Re_ortho < 1e-10)
    Re_ortho = 1e-10;
  // Compute lambda
  lambda.setVar(0, reynolds);
  lambda.setVar(1, Re_l);
  lambda.setVar(2, t);
  lambda.setVar(3, pos[0]);
  if (dimension > 1)
    lambda.setVar(4, pos[1]);
  if (dimension > 2)
    lambda.setVar(5, pos[2]);
 
  // Compute lambda_ortho
  lambda_ortho.setVar(0, reynolds);
  lambda_ortho.setVar(1, Re_ortho);
  lambda_ortho.setVar(2, t);
  lambda_ortho.setVar(3, pos[0]);
  if (dimension > 1)
    lambda_ortho.setVar(4, pos[1]);
  if (dimension > 2)
    lambda_ortho.setVar(5, pos[2]);
  double l_ortho = lambda_ortho.eval(); // To avoid evaluating the parser twice
  double l_long = lambda.eval();
  coeff_ortho = l_ortho * u_ortho / 2. / dh_ortho;
  coeff_long = l_long * std::fabs(u_l) / 2. / dh;
}