Tensors_Computation_VDF.cpp

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#include <Tensors_Computation_VDF.h>
#include <TRUSTTab.h>
#include <Domaine_VDF.h>
#include <Domaine_Cl_VDF.h>
#include <Champ_Face_VDF.h>
#include <Probleme_base.h>
 
using TCV = Tensors_Computation_VDF;
 
void TCV::compute_enstrophy(const Domaine_VDF& dom_VDF,
                            const Domaine_Cl_VDF& dom_BC_VDF,
                            const DoubleTab& velocity,
                            Champ_Face_VDF& ch_vit,
                            Navier_Stokes_Turbulent& ns_turb,
                            DoubleTab& enstrophy) const
{
  // Get gradient of velocity
  const int nb_elem_tot = dom_VDF.nb_elem_tot();
  const int dimension = Objet_U::dimension;
  DoubleTab gradient_elem(nb_elem_tot, dimension*dimension);
  gradient_elem = 0.;
 
  if (ns_turb.has_champ("gradient_vitesse")) //if the gradient is already computed (post_processing)
    gradient_elem.ref(ns_turb.get_champ("gradient_vitesse").valeurs());
  else
    ch_vit.calcul_grad_u(velocity, gradient_elem, dom_BC_VDF);
 
  antisym_enstrophy(dom_VDF, gradient_elem, enstrophy);
}
 
void TCV::compute_strain_invariant(const Domaine_VDF& dom_VDF,
                                   const Domaine_Cl_VDF& dom_BC_VDF,
                                   const DoubleTab& velocity,
                                   Champ_Face_VDF& ch_vit,
                                   Navier_Stokes_Turbulent& ns_turb,
                                   DoubleTab& strain_invariant) const
{
  // Get gradient of velocity
  const int nb_elem_tot = dom_VDF.nb_elem_tot();
  const int dimension = Objet_U::dimension;
  DoubleTab gradient_elem(nb_elem_tot, dimension*dimension);
  gradient_elem = 0.;
 
  if (ns_turb.has_champ("gradient_vitesse")) //if the gradient is already computed (post_processing)
    gradient_elem.ref(ns_turb.get_champ("gradient_vitesse").valeurs());
  else
    ch_vit.calcul_grad_u(velocity, gradient_elem, dom_BC_VDF);
 
  antisym_strain_invariant(dom_VDF, gradient_elem, strain_invariant);
}
 
void TCV::antisym_strain_invariant(const Domaine_VDF& dom_VDF,
                                   const DoubleTab& gradient_elem,
                                   DoubleTab& strain_invariant) const
{
  const int nb_elem = dom_VDF.nb_elem();
  for (int elem=0; elem<nb_elem; elem++)
    {
      double SijSij=0;
      if (Objet_U::dimension==2)
        {
          const double du_dx= gradient_elem(elem,0);
          const double du_dy= gradient_elem(elem,1);
          const double dv_dx= gradient_elem(elem,2);
          const double dv_dy= gradient_elem(elem,3);
          SijSij = du_dx*du_dx
                   +0.5*(du_dy+dv_dx)*(du_dy+dv_dx)
                   +dv_dy*dv_dy ;
        }
      if(Objet_U::dimension==3)
        {
          const double du_dx= gradient_elem(elem,0);
          const double du_dy= gradient_elem(elem,1);
          const double du_dz= gradient_elem(elem,2);
          const double dv_dx= gradient_elem(elem,3);
          const double dv_dy= gradient_elem(elem,4);
          const double dv_dz= gradient_elem(elem,5);
          const double dw_dx= gradient_elem(elem,6);
          const double dw_dy= gradient_elem(elem,7);
          const double dw_dz= gradient_elem(elem,8);
 
          SijSij = du_dx*du_dx
                   +0.5*(du_dy+dv_dx)*(du_dy+dv_dx)
                   +dv_dy*dv_dy+
                   0.5*(du_dz+dw_dx)*(du_dz+dw_dx)
                   + 0.5*(dv_dz+dw_dy)*(dv_dz+dw_dy)
                   + dw_dz*dw_dz ;
        }
      strain_invariant(elem) = sqrt(2*SijSij);
    }
}
 
void TCV::antisym_enstrophy(const Domaine_VDF& dom_VDF,
                            const DoubleTab& gradient_elem,
                            DoubleTab& enstrophy) const
{
  const int nb_elem = dom_VDF.nb_elem();
  for (int elem=0; elem<nb_elem; elem++)
    {
      double tmp=0.;
      if (Objet_U::dimension==2)
        {
          const double du_dy= gradient_elem(elem,1);
          const double dv_dx= gradient_elem(elem,2);
          tmp =  0.5*((du_dy - dv_dx)*(du_dy - dv_dx) +
                      (dv_dx - du_dy)*(dv_dx - du_dy));
        }
      if(Objet_U::dimension==3)
        {
          const double du_dy= gradient_elem(elem,1);
          const double dv_dx= gradient_elem(elem,3);
 
          const double du_dz= gradient_elem(elem,2);
          const double dv_dz= gradient_elem(elem,5);
          const double dw_dx= gradient_elem(elem,6);
          const double dw_dy= gradient_elem(elem,7);
 
          tmp = 0.5*( (du_dy - dv_dx)*(du_dy - dv_dx) +
                      (dv_dx - du_dy)*(dv_dx - du_dy) +
                      (du_dz - dw_dx)*(du_dz - dw_dx) +
                      (dv_dz - dw_dy)*(dv_dz - dw_dy) +
                      (dw_dx - du_dz)*(dw_dx - du_dz) +
                      (dw_dy - dv_dz)*(dw_dy - dv_dz)
                    );
 
 
        }
      enstrophy(elem) = sqrt(tmp);
    }
}