Modele_Launder_Sharma_VEF.cpp

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#include <Modele_Launder_Sharma_VEF.h>
#include <Domaine_VEF.h>
#include <Champ_Uniforme.h>
#include <Champ_P1NC.h>
 
Implemente_instanciable(Modele_Launder_Sharma_VEF,"Modele_Launder_Sharma_VEF",Modele_Lam_Bremhorst_VEF);
 
 
 
///////////////////////////////////////////////////////////////
//   Implementation des fonctions de la classe
///////////////////////////////////////////////////////////////
// printOn et readOn
 
Sortie& Modele_Launder_Sharma_VEF::printOn(Sortie& s ) const
{
  return s;
}
 
Entree& Modele_Launder_Sharma_VEF::readOn(Entree& is )
{
  return Modele_Lam_Bremhorst_VEF::readOn(is);
}
 
void Modele_Launder_Sharma_VEF::lire_distance_paroi( )
{
 
// Pas besoin de la distance a la proi dans ce modele
 
}
 
 
DoubleTab& Modele_Launder_Sharma_VEF::Calcul_D(DoubleTab& D,const Domaine_dis_base& domaine_dis, const Domaine_Cl_dis_base& domaine_Cl_dis,
                                               const DoubleTab& vitesse,const DoubleTab& K_eps_Bas_Re, const Champ_Don_base& ch_visco ) const
{
  double visco=-1;
  const DoubleTab& tab_visco=ch_visco.valeurs();
  int is_visco_const=sub_type(Champ_Uniforme,ch_visco);
  if (is_visco_const)
    visco=tab_visco(0,0);
  const Domaine_VEF& le_dom = ref_cast(Domaine_VEF,domaine_dis);
  //  const Domaine_Cl_VEF& le_dom_Cl = ref_cast(Domaine_Cl_VEF,domaine_Cl_dis);
  const DoubleVect& volumes = le_dom.volumes();
  //  int nb_faces = le_dom.nb_faces();
  int nb_faces_tot = le_dom.nb_faces();
  //  int nb_elem = le_dom.nb_elem();
  int nb_elem_tot = le_dom.nb_elem_tot();
  //  int nb_elem_tot = le_dom.nb_elem_tot();
  const Domaine& domaine=le_dom.domaine();
  const IntTab& elem_faces = le_dom.elem_faces();
  const int nb_faces_elem = domaine.nb_faces_elem();
  const DoubleTab& face_normales = le_dom.face_normales();
  const DoubleVect& vol_ent = le_dom.volumes_entrelaces();
 
  D = 0;
  //return D;
  int num_elem,i,face_loc,face_glob,num_face;
  double deriv,Vol;
 
  // Algo :
  //   * Boucle sur les elements
  //      * boucle locale dans l'element sur les faces -> calcul du gradient de racine de k
  //      * distribution de la valeur de l'integrale sur les faces de l'element
  //  Cela doit etre OK!!!
  // Rq : k et epsilon sont definis comme la vitesse P1NC.
 
  // ET le // ????? nb_elem ou nb_elem_tot
  // Pbls des C.L. en paroi???? non car on impose epsilon-D = 0!!
  for (num_elem=0; num_elem<nb_elem_tot; num_elem++)
    {
      Vol = volumes(num_elem);
      for(i=0; i<dimension; i++)
        {
          deriv = 0;
          for(face_loc=0; face_loc<nb_faces_elem; face_loc++)
            {
              face_glob = elem_faces(num_elem,face_loc);
              deriv += sqrt(K_eps_Bas_Re(face_glob,0))*face_normales(face_glob,i)*le_dom.oriente_normale(face_glob,num_elem);
            }
          deriv /= Vol;
          for(face_loc=0; face_loc<nb_faces_elem; face_loc++)
            {
              face_glob = elem_faces(num_elem,face_loc);
              /*              Cerr<<"face_glob = "<<face_glob<<finl;
                              Cerr<<"K_eps_Bas_Re(face_glob,0) = "<<K_eps_Bas_Re(face_glob,0)<<finl;
                              Cerr<<"deriv = "<<deriv<<", Vol = "<<Vol<<", nb_faces_elem = "<<nb_faces_elem<<finl;*/
              if (!is_visco_const)
                visco=tab_visco(num_elem);
              // on divise par nb_faces_elem pour dire que chaque elem
              // contribue pour 1/3 de son volume en 2D.
              D(face_glob) += visco*deriv*deriv*Vol/nb_faces_elem;
            }
        }
    }
  // on divise par vol_ent car en 2d c 2/3 du volume. Donc en tout en 2D
  // chaque face recoit en tout 2 * (1/3) * vol / (vol * (2/3))=1 !
  for (num_face=0; num_face<nb_faces_tot; num_face++)
    D(num_face) *= 2./vol_ent(num_face);
 
  // RQ : il faut diviser par le volume entrelace car ce que nous calculons c est l integrale en V
  // Par contre dans les termes sources on multiplie par le volume entrelace donc pour rester coherent avec le reste....
  //D=0;
  //  D*=0.5;
  return D;
}
 
 
// Fonction utile visc
// Pour le calcul de la derivee seconde
// 1/|v|*(Si,elem)ind_der*(Sj,elem)ind_der
/* pas appele
   static double viscA(const Domaine_VEF& le_dom,int num_face,int num2,int dimension,
   int num_elem, int ind_der)
   {
   double pscal;
 
   pscal = le_dom.face_normales(num_face,ind_der)*le_dom.face_normales(num2,ind_der);
 
   if ( (le_dom.face_voisins(num_face,0) == le_dom.face_voisins(num2,0)) ||
   (le_dom.face_voisins(num_face,1) == le_dom.face_voisins(num2,1)))
   return -pscal/le_dom.volumes(num_elem);
   else
   return pscal/le_dom.volumes(num_elem);
   }
*/
 
DoubleTab& Modele_Launder_Sharma_VEF::Calcul_E(DoubleTab& E,const Domaine_dis_base& domaine_dis, const Domaine_Cl_dis_base& domaine_Cl_dis, const DoubleTab& transporte,const DoubleTab& K_eps_Bas_Re,const Champ_Don_base& ch_visco, const DoubleTab& visco_turb ) const
{
  double visco=-1;
  const DoubleTab& tab_visco=ch_visco.valeurs();
  int is_visco_const=sub_type(Champ_Uniforme,ch_visco);
  if (is_visco_const)
    visco=tab_visco(0,0);
  //const Domaine_Cl_VEF& domaine_Cl_VEF = ref_cast(Domaine_Cl_VEF,domaine_Cl_dis);
  const Domaine_VEF& domaine_VEF =  ref_cast(Domaine_VEF,domaine_dis);
  E = 0;
  //return E;
  //  const IntTab& elem_faces = domaine_VEF.elem_faces();
  const IntTab& face_voisins = domaine_VEF.face_voisins();
  const DoubleVect& volumes = domaine_VEF.volumes();
  //const DoubleTab& face_normales = domaine_VEF.face_normales();
  //  const DoubleTab& facette_normales = domaine_VEF.facette_normales();
  //  const DoubleVect& volumes_entrelaces = domaine_VEF.volumes_entrelaces();
  //  const Domaine& domaine = domaine_VEF.domaine();
  const int nb_faces = domaine_VEF.nb_faces();
  //  int nb_faces_tot = domaine_VEF.nb_faces_tot();
  //  const int nfa7 = domaine_VEF.type_elem().nb_facette();
  const int nb_elem = domaine_VEF.nb_elem();
  //  const IntVect& rang_elem_non_std = domaine_VEF.rang_elem_non_std();
  //int premiere_face_int = domaine_VEF.premiere_face_int();
  int premiere_face_int = domaine_VEF.premiere_face_int();
 
  int i,j;
  int elem,elem0,elem2;
  //int n_bord;//alpha,beta,elem0;
  //  int nb_faces_elem = domaine_VEF.domaine().nb_faces_elem();
 
  //  double val;
 
  const int ncomp_ch_transporte = transporte.line_size();
 
  DoubleTab gradient(0, ncomp_ch_transporte, dimension);
  domaine_VEF.creer_tableau_faces(gradient);
 
  DoubleTab deriv_seconde_de_gradient_elem(0, ncomp_ch_transporte, dimension, dimension);
  domaine_VEF.domaine().creer_tableau_elements(deriv_seconde_de_gradient_elem);
  deriv_seconde_de_gradient_elem=0.;
 
  DoubleTab champ_face(0,dimension);
  domaine_VEF.creer_tableau_faces(champ_face);
 
  // Calcul de la derivee premiere de U
  // stokage d'un gradient_elem par element.
  DoubleTab gradient_elem(0, ncomp_ch_transporte, dimension);
  domaine_VEF.domaine().creer_tableau_elements(gradient_elem);
 
  DoubleTab champ_elem(0, ncomp_ch_transporte, dimension);
  domaine_VEF.domaine().creer_tableau_elements(champ_elem);
 
  DoubleTab deriv_seconde_de_gradient(0, ncomp_ch_transporte, dimension, dimension);
  domaine_VEF.creer_tableau_faces(deriv_seconde_de_gradient);
  deriv_seconde_de_gradient=0.;
 
  int fac=-1,elem1,comp;
  // Rque methode non const Pourquoi ?
 
  const Champ_P1NC& vitesse = ref_cast(Champ_P1NC,eq_hydraulique->inconnue());
  ref_cast_non_const(Champ_P1NC,vitesse).calcul_gradient(transporte,gradient_elem,ref_cast(Domaine_Cl_VEF,eq_hydraulique->domaine_Cl_dis()));
 
  gradient_elem.echange_espace_virtuel();
  // On a les gradient_elem par elements
  // Boucle sur les faces
  //
  for (fac=0; fac< premiere_face_int; fac++)
    for (comp=0; comp<ncomp_ch_transporte; comp++)
      for (i=0; i<dimension; i++)
        {
          elem1=face_voisins(fac,0);
          elem2=face_voisins(fac,1);
          if (elem2 != -1)
            {
              double vol1=volumes(elem1);
              double vol2=volumes(elem2);
              double voltot=vol1+vol2;
              for (comp=0; comp<ncomp_ch_transporte; comp++)
                for (i=0; i<dimension; i++)
                  {
                    double grad1=gradient_elem(elem1, comp, i);
                    double grad2=gradient_elem(elem2, comp, i);
                    gradient(fac, comp, i) =  (vol1*grad1 + vol2*grad2)/voltot;
                  }
            }
          else
            for (comp=0; comp<ncomp_ch_transporte; comp++)
              for (i=0; i<dimension; i++)
                gradient(fac, comp, i) =  gradient_elem(elem1, comp, i);
        }
// fin du for faces
 
  for (; fac<nb_faces; fac++)
    {
      elem1=face_voisins(fac,0);
      elem2=face_voisins(fac,1);
      double vol1=volumes(elem1);
      double vol2=volumes(elem2);
      double voltot=vol1+vol2;
      for (comp=0; comp<ncomp_ch_transporte; comp++)
        for (i=0; i<dimension; i++)
          {
            double grad1=gradient_elem(elem1, comp, i);
            double grad2=gradient_elem(elem2, comp, i);
            gradient(fac, comp, i) =  (vol1*grad1 + vol2*grad2)/voltot;
          }
    } // fin du for faces
 
  gradient.echange_espace_virtuel();
//on a les gradients sur les faces.
 
 
  // maintenant on calcul la derivee seconde
  // stokage de la derivee seconde par element.
  for (i=0; i<dimension; i++)
    {
      for (comp=0; comp<ncomp_ch_transporte; comp++)
        for (fac=0; fac<nb_faces; fac++)
          champ_face(fac,comp)=gradient(fac, comp, i);
 
      ref_cast_non_const(Champ_P1NC,vitesse).calcul_gradient(champ_face,champ_elem,ref_cast(Domaine_Cl_VEF,eq_hydraulique->domaine_Cl_dis()));
 
      for (comp=0; comp<ncomp_ch_transporte; comp++)
        for ( elem=0; elem<nb_elem; elem++)
          for (j=0; j<dimension; j++)
            deriv_seconde_de_gradient_elem(elem,comp,i,j) = champ_elem(elem,comp,j);
 
    }
 
  deriv_seconde_de_gradient_elem.echange_espace_virtuel();
  // On a les gradient_elem par elements
 
  // Boucle sur les faces
  //
 
  for (fac=0; fac< premiere_face_int; fac++)
    {
      for (comp=0; comp<ncomp_ch_transporte; comp++)
        for (j=0; j<dimension; j++)
          for (i=0; i<dimension; i++)
            {
              elem1=face_voisins(fac,0);
              if (elem1 != -1)
                deriv_seconde_de_gradient(fac, comp, i, j) = deriv_seconde_de_gradient_elem(elem1, comp, i, j);
              else
                {
                  elem1=face_voisins(fac,1);
                  deriv_seconde_de_gradient(fac, comp, i, j) = deriv_seconde_de_gradient_elem(elem1, comp, i, j);
                }
            }
 
    } // fin du for faces
 
  for (; fac<nb_faces; fac++)
    {
      elem1=face_voisins(fac,0);
      elem2=face_voisins(fac,1);
      double vol1=volumes(elem1);
      double vol2=volumes(elem2);
      double voltot=vol1+vol2;
      for (comp=0; comp<ncomp_ch_transporte; comp++)
        for (j=0; j<dimension; j++)
          for (i=0; i<dimension; i++)
            {
              double grad1=deriv_seconde_de_gradient_elem(elem1, comp, i, j);
              double grad2=deriv_seconde_de_gradient_elem(elem2, comp, i, j);
              deriv_seconde_de_gradient(fac, comp, i, j) = (vol1*grad1 + vol2*grad2)/voltot;
            }
    } // fin du for faces
 
  // Calcul de E
  double deriv,nuturb;
  for (fac=0; fac<nb_faces; fac++)
    {
      deriv = 0;
      if (dimension == 2)
        {
          double val2 = deriv_seconde_de_gradient(fac,0,1,1)*deriv_seconde_de_gradient(fac,0,1,1);
          double val3 = deriv_seconde_de_gradient(fac,1,0,0)*deriv_seconde_de_gradient(fac,1,0,0);
          deriv = val2 + val3;
          //deriv = gradient(fac, 0, 1);
        }
      else
        {
          double val2 = deriv_seconde_de_gradient(fac,1,0,0)+deriv_seconde_de_gradient(fac,2,0,0); //d2v_dx2(fac)+d2w_dx2(fac);
          val2 *= val2;
          double val3 = deriv_seconde_de_gradient(fac,0,1,1)+deriv_seconde_de_gradient(fac,2,1,1); //d2u_dy2(fac)+d2w_dy2(fac);
          val3 *= val3;
          double val4 = deriv_seconde_de_gradient(fac,0,2,2)+deriv_seconde_de_gradient(fac,1,2,2); //d2u_dz2(fac)+d2v_dz2(fac);
          val4 *= val4;
          deriv = val2 + val3 + val4;
 
        }
      elem0 = face_voisins(fac,0);
      elem1 = face_voisins(fac,1);
 
      if (elem1!=-1)
        {
          nuturb = visco_turb(elem0)*volumes(elem0)+visco_turb(elem1)*volumes(elem1);
          nuturb /= volumes(elem0) + volumes(elem1);
          if (!is_visco_const)
            visco=(tab_visco(elem0)+tab_visco(elem1))/2.;
        }
      else
        {
          nuturb =  visco_turb(elem0);
          if (!is_visco_const)
            visco=(tab_visco(elem0));
        }
 
      E(fac) = 2.*visco*deriv*nuturb;
 
    }
  //E=0;
//  Cerr<<E.mp_min_vect()<<" EEEEEEEEEEEEEEEEEEEEEEEE "<<E.mp_max_vect()<<finl;
 
  return E;
}
 
DoubleTab& Modele_Launder_Sharma_VEF::Calcul_F1( DoubleTab& F1, const Domaine_dis_base& domaine_dis, const Domaine_Cl_dis_base& domaine_Cl_dis, const DoubleTab& P, const DoubleTab& K_eps_Bas_Re,const Champ_base& ch_visco) const
{
  const Domaine_VEF& le_dom = ref_cast(Domaine_VEF,domaine_dis);
  int nb_faces = le_dom.nb_faces();
  for (int num_face=0; num_face <nb_faces; num_face ++ )
    F1[num_face] = 1.;
  return F1;
}
 
DoubleTab& Modele_Launder_Sharma_VEF::Calcul_F2( DoubleTab& F2, DoubleTab& Deb, const Domaine_dis_base& domaine_dis,const DoubleTab& K_eps_Bas_Re,const Champ_base& ch_visco ) const
{
  double visco=-1;
  const DoubleTab& tab_visco=ch_visco.valeurs();
  int is_visco_const=sub_type(Champ_Uniforme,ch_visco);
  if (is_visco_const)
    visco=tab_visco(0,0);
  const Domaine_VEF& le_dom = ref_cast(Domaine_VEF,domaine_dis);
  int nb_faces = le_dom.nb_faces();
  int num_face;
  double Re;
 
  for (num_face=0; num_face<nb_faces  ; num_face++)
    {
      if (K_eps_Bas_Re(num_face,1)>0)
        {
          if (!is_visco_const)
            {
              int elem0 = le_dom.face_voisins(num_face,0);
              int elem1 = le_dom.face_voisins(num_face,1);
              if (elem1!=-1)
                {
                  visco = tab_visco(elem0)*le_dom.volumes(elem0)+tab_visco(elem1)*le_dom.volumes(elem1);
                  visco /= le_dom.volumes(elem0) + le_dom.volumes(elem1);
                }
              else
                visco =  tab_visco(elem0);
 
            }
          if (visco>0)
            {
              Re = (K_eps_Bas_Re(num_face,0)*K_eps_Bas_Re(num_face,0))/(visco*K_eps_Bas_Re(num_face,1));
              F2[num_face] = 1. - (0.3*exp(-Re*Re));
            }
        }
      else
        {
          F2[num_face] = 1.;
        }
    }
  //Cerr<<F2.mp_min_vect()<<" F2 "<<F2.mp_max_vect()<<finl;
  return F2;
}
 
DoubleTab&  Modele_Launder_Sharma_VEF::Calcul_Fmu( DoubleTab& Fmu,const Domaine_dis_base& domaine_dis,const Domaine_Cl_dis_base& domaine_Cl_dis,const DoubleTab& K_eps_Bas_Re,const Champ_Don_base& ch_visco ) const
{
  double visco=-1;
  const DoubleTab& tab_visco=ch_visco.valeurs();
  int is_visco_const=sub_type(Champ_Uniforme,ch_visco);
  if (is_visco_const)
    visco=tab_visco(0,0);
  const Domaine_VEF& le_dom = ref_cast(Domaine_VEF,domaine_dis);
  int nb_faces = le_dom.nb_faces();
  int num_face;
  double Re;
  Fmu = 0;
 
  for (num_face=0; num_face<nb_faces  ; num_face++)
    {
      if(1) // if (K_eps_Bas_Re(num_face,1)>0)
        {
          if (!is_visco_const)
            {
              int elem0 = le_dom.face_voisins(num_face,0);
              int elem1 = le_dom.face_voisins(num_face,1);
              if (elem1!=-1)
                {
                  visco = tab_visco(elem0)*le_dom.volumes(elem0)+tab_visco(elem1)*le_dom.volumes(elem1);
                  visco /= le_dom.volumes(elem0) + le_dom.volumes(elem1);
                }
              else
                visco =  tab_visco(elem0);
            }
          Re = (K_eps_Bas_Re(num_face,0)*K_eps_Bas_Re(num_face,0))/(visco*(K_eps_Bas_Re(num_face,1)+DMINFLOAT));
          Fmu[num_face] = exp(-3.4/((1.+Re/50.)*(1.+Re/50.)));
 
        }
      else
        {
          Fmu[num_face] = 1.;
        }
    }
//  Cerr<<Fmu.mp_min_vect()<<" Fmu " <<Fmu.mp_max_vect()<<finl;
  return Fmu;
}
 
 
DoubleTab&  Modele_Launder_Sharma_VEF::Calcul_Fmu_BiK( DoubleTab& Fmu,const Domaine_dis_base& domaine_dis,const Domaine_Cl_dis_base& domaine_Cl_dis,const DoubleTab& K_Bas_Re,const DoubleTab& eps_Bas_Re,const Champ_Don_base& ch_visco ) const
{
  double visco=-1;
  const DoubleTab& tab_visco=ch_visco.valeurs();
  int is_visco_const=sub_type(Champ_Uniforme,ch_visco);
  if (is_visco_const)
    visco=tab_visco(0,0);
  const Domaine_VEF& le_dom = ref_cast(Domaine_VEF,domaine_dis);
  int nb_faces = le_dom.nb_faces();
  int num_face;
  double Re;
  Fmu = 0;
 
  for (num_face=0; num_face<nb_faces  ; num_face++)
    {
      if(1) // if (K_eps_Bas_Re(num_face,1)>0)
        {
          if (!is_visco_const)
            {
              int elem0 = le_dom.face_voisins(num_face,0);
              int elem1 = le_dom.face_voisins(num_face,1);
              if (elem1!=-1)
                {
                  visco = tab_visco(elem0)*le_dom.volumes(elem0)+tab_visco(elem1)*le_dom.volumes(elem1);
                  visco /= le_dom.volumes(elem0) + le_dom.volumes(elem1);
                }
              else
                visco =  tab_visco(elem0);
            }
          Re = (K_Bas_Re(num_face)*K_Bas_Re(num_face))/(visco*(eps_Bas_Re(num_face)+DMINFLOAT));
          Fmu[num_face] = exp(-3.4/((1.+Re/50.)*(1.+Re/50.)));
 
        }
      else
        {
          Fmu[num_face] = 1.;
        }
    }
  Cerr<<Fmu.mp_min_vect()<<" Fmu " <<Fmu.mp_max_vect()<<finl;
  return Fmu;
}
 
 
DoubleTab& Modele_Launder_Sharma_VEF::Calcul_F2_BiK( DoubleTab& F2, DoubleTab& Deb, const Domaine_dis_base& domaine_dis,const DoubleTab& K_Bas_Re,const DoubleTab& eps_Bas_Re,const Champ_base& ch_visco ) const
{
  double visco=-1;
  const DoubleTab& tab_visco=ch_visco.valeurs();
  int is_visco_const=sub_type(Champ_Uniforme,ch_visco);
  if (is_visco_const)
    visco=tab_visco(0,0);
  const Domaine_VEF& le_dom = ref_cast(Domaine_VEF,domaine_dis);
  int nb_faces = le_dom.nb_faces();
  int num_face;
  double Re;
 
  for (num_face=0; num_face<nb_faces  ; num_face++)
    {
      if (eps_Bas_Re(num_face)>0)
        {
          if (!is_visco_const)
            {
              int elem0 = le_dom.face_voisins(num_face,0);
              int elem1 = le_dom.face_voisins(num_face,1);
              if (elem1!=-1)
                {
                  visco = tab_visco(elem0)*le_dom.volumes(elem0)+tab_visco(elem1)*le_dom.volumes(elem1);
                  visco /= le_dom.volumes(elem0) + le_dom.volumes(elem1);
                }
              else
                visco =  tab_visco(elem0);
 
            }
          if (visco>0)
            {
              Re = (K_Bas_Re(num_face)*K_Bas_Re(num_face))/(visco*eps_Bas_Re(num_face));
              F2[num_face] = 1. - (0.3*exp(-Re*Re));
            }
        }
      else
        {
          F2[num_face] = 1.;
        }
    }
  //Cerr<<F2.mp_min_vect()<<" F2 "<<F2.mp_max_vect()<<finl;
  return F2;
}
 
 
 
DoubleTab& Modele_Launder_Sharma_VEF::Calcul_F1_BiK( DoubleTab& F1, const Domaine_dis_base& domaine_dis, const Domaine_Cl_dis_base& domaine_Cl_dis, const DoubleTab& P, const DoubleTab& K_Bas_Re, const DoubleTab& eps_Bas_Re,const Champ_base& ch_visco) const
{
  const Domaine_VEF& le_dom = ref_cast(Domaine_VEF,domaine_dis);
  int nb_faces = le_dom.nb_faces();
  for (int num_face=0; num_face <nb_faces; num_face ++ )
    F1[num_face] = 1.;
  return F1;
}
 
 
DoubleTab& Modele_Launder_Sharma_VEF::Calcul_E_BiK(DoubleTab& E,const Domaine_dis_base& domaine_dis, const Domaine_Cl_dis_base& domaine_Cl_dis, const DoubleTab& transporte,const DoubleTab& K_Bas_Re,const DoubleTab& eps_Bas_Re,const Champ_Don_base& ch_visco, const DoubleTab& visco_turb ) const
{
  return Calcul_E( E,domaine_dis,domaine_Cl_dis,transporte,K_Bas_Re,ch_visco,visco_turb );
}
 
DoubleTab& Modele_Launder_Sharma_VEF::Calcul_D_BiK(DoubleTab& D,const Domaine_dis_base& domaine_dis, const Domaine_Cl_dis_base& domaine_Cl_dis,
                                                   const DoubleTab& vitesse,const DoubleTab& K_Bas_Re,const DoubleTab& eps_Bas_Re, const Champ_Don_base& ch_visco ) const
{
  double visco=-1;
  const DoubleTab& tab_visco=ch_visco.valeurs();
  int is_visco_const=sub_type(Champ_Uniforme,ch_visco);
  if (is_visco_const)
    visco=tab_visco(0,0);
  const Domaine_VEF& le_dom = ref_cast(Domaine_VEF,domaine_dis);
  //  const Domaine_Cl_VEF& le_dom_Cl = ref_cast(Domaine_Cl_VEF,domaine_Cl_dis);
  const DoubleVect& volumes = le_dom.volumes();
  //  int nb_faces = le_dom.nb_faces();
  int nb_faces_tot = le_dom.nb_faces();
  //  int nb_elem = le_dom.nb_elem();
  int nb_elem_tot = le_dom.nb_elem_tot();
  //  int nb_elem_tot = le_dom.nb_elem_tot();
  const Domaine& domaine=le_dom.domaine();
  const IntTab& elem_faces = le_dom.elem_faces();
  const int nb_faces_elem = domaine.nb_faces_elem();
  const DoubleTab& face_normales = le_dom.face_normales();
  const DoubleVect& vol_ent = le_dom.volumes_entrelaces();
 
  D = 0;
  //return D;
  int num_elem,i,face_loc,face_glob,num_face;
  double deriv,Vol;
 
  // Algo :
  //   * Boucle sur les elements
  //      * boucle locale dans l'element sur les faces -> calcul du gradient de racine de k
  //      * distribution de la valeur de l'integrale sur les faces de l'element
  //  Cela doit etre OK!!!
  // Rq : k et epsilon sont definis comme la vitesse P1NC.
 
  // ET le // ????? nb_elem ou nb_elem_tot
  // Pbls des C.L. en paroi???? non car on impose epsilon-D = 0!!
  for (num_elem=0; num_elem<nb_elem_tot; num_elem++)
    {
      Vol = volumes(num_elem);
      for(i=0; i<dimension; i++)
        {
          deriv = 0;
          for(face_loc=0; face_loc<nb_faces_elem; face_loc++)
            {
              face_glob = elem_faces(num_elem,face_loc);
              deriv += sqrt(K_Bas_Re(face_glob))*face_normales(face_glob,i)*le_dom.oriente_normale(face_glob,num_elem);
            }
          deriv /= Vol;
          for(face_loc=0; face_loc<nb_faces_elem; face_loc++)
            {
              face_glob = elem_faces(num_elem,face_loc);
              /*              Cerr<<"face_glob = "<<face_glob<<finl;
                              Cerr<<"K_eps_Bas_Re(face_glob,0) = "<<K_eps_Bas_Re(face_glob,0)<<finl;
                              Cerr<<"deriv = "<<deriv<<", Vol = "<<Vol<<", nb_faces_elem = "<<nb_faces_elem<<finl;*/
              if (!is_visco_const)
                visco=tab_visco(num_elem);
              // on divise par nb_faces_elem pour dire que chaque elem
              // contribue pour 1/3 de son volume en 2D.
              D(face_glob) += visco*deriv*deriv*Vol/nb_faces_elem;
            }
        }
    }
  // on divise par vol_ent car en 2d c 2/3 du volume. Donc en tout en 2D
  // chaque face recoit en tout 2 * (1/3) * vol / (vol * (2/3))=1 !
  for (num_face=0; num_face<nb_faces_tot; num_face++)
    D(num_face) *= 2./vol_ent(num_face);
 
  // RQ : il faut diviser par le volume entrelace car ce que nous calculons c est l integrale en V
  // Par contre dans les termes sources on multiplie par le volume entrelace donc pour rester coherent avec le reste....
  //D=0;
  //  D*=0.5;
  return D;
}