Terme_Source_Qdm_Elem_DG.cpp

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#include <Terme_Source_Qdm_Elem_DG.h>
#include <Neumann_sortie_libre.h>
#include <Domaine_Cl_DG.h>
#include <Neumann_homogene.h>
#include <Domaine_DG.h>
#include <Champ_Uniforme.h>
#include <BasisFunction.h>
#include <Equation_base.h>
#include <Milieu_base.h>
#include <Neumann.h>
#include <Field_base.h>
 
Implemente_instanciable(Terme_Source_Qdm_Elem_DG, "Source_Qdm_Elem_DG", Source_base);
 
Sortie& Terme_Source_Qdm_Elem_DG::printOn(Sortie& s) const { return s << que_suis_je(); }
 
/**
 * @brief Reads the momentum source term from the input stream.
 * @details Reads the source field la_source (a Champ_Don_base), then discretizes it
 * onto the DG quadrature representation la_source_DG (Champ_Fonc_Quad_DG) using the
 * problem's discretization. la_source_DG is initialized to zero and then filled by
 * affectation from la_source, pre-sampling the field at all quadrature points.
 * @param s The input stream.
 * @return The input stream.
 */
Entree& Terme_Source_Qdm_Elem_DG::readOn(Entree& s)
{
  s >> la_source;
  const int nb_comp = la_source->nb_comp();
 
  Noms noms;
  Noms unites;
  noms.add("Terme_Source_DG");
  unites.add("kg.m.s^-1");
 
  equation().probleme().discretisation().discretiser_champ("champ_fonc_quad_dg", equation().domaine_dis(), Nature_du_champ::vectoriel, noms, unites,nb_comp,0., la_source_DG);
  la_source_DG->valeurs() = 0.;
  la_source_DG->affecter(la_source);
 
  return s ;
}
 
void Terme_Source_Qdm_Elem_DG::associer_domaines(const Domaine_dis_base& domaine_dis, const Domaine_Cl_dis_base& domaine_Cl_dis)
{
  le_dom_DG = ref_cast(Domaine_DG, domaine_dis);
  le_dom_Cl_DG = ref_cast(Domaine_Cl_DG, domaine_Cl_dis);
}
 
/**
 * @brief Assembles the momentum source contribution into the right-hand side.
 *
 * @details For each element and each velocity DOF (fb, d), computes:
 *   secmem(elem, fb + d*nb_bfunc) += integral of f_d(x) * phi_fb(x) dV
 * using a fixed order-5 quadrature. The integrand at quadrature point k is:
 *   product(k) = la_source_DG(elem, k + d*nb_pts_integ_max) * fbase(fb, k)
 * For Champ_Uniforme sources, element index 0 is used for all elements.
 * No matrix contribution is made (source terms are purely explicit here).
 *
 * @param matrices  Unused (no matrix contribution).
 * @param secmem    The momentum right-hand side to accumulate into.
 * @param semi_impl Unused.
 */
void Terme_Source_Qdm_Elem_DG::ajouter_blocs(matrices_t matrices, DoubleTab& secmem, const tabs_t& semi_impl) const
{
  const Domaine_DG& dom = ref_cast(Domaine_DG, le_dom_DG.valeur());
 
  int order = Option_DG::Get_order_for("vitesse");
 
  const BasisFunction& bfunc = dom.get_basisFunction(order);
  const int nb_bfunc = bfunc.nb_bfunc();
 
  const Quadrature_base& quad = dom.get_quadrature(5);
  int nb_pts_integ_max = quad.nb_pts_integ_max();
 
  DoubleTab product(nb_pts_integ_max);
 
  DoubleTab fbase(nb_bfunc, nb_pts_integ_max);
 
  const int dim = Objet_U::dimension;
 
  for (int elem = 0; elem < dom.nb_elem(); elem++)
    {
      bfunc.eval_bfunc(quad, elem, fbase);
      for (int d = 0; d < dim; d++)
        for (int fb = 0; fb < nb_bfunc; fb++)
          {
            for (int k = 0; k < quad.nb_pts_integ(elem) ; k++)
              product(k) =  la_source_DG->valeurs()(sub_type(Champ_Uniforme,la_source.valeur()) ? 0 : elem, k + d*nb_pts_integ_max) * fbase(fb, k);
 
            secmem(elem, fb + d*nb_bfunc) += quad.compute_integral_on_elem(elem, product);
          }
    }
}
 
void Terme_Source_Qdm_Elem_DG::mettre_a_jour(double temps)
{
  la_source->mettre_a_jour(temps);
}