Atmospheric examples

Initialization and finalization

Initialization and finalization is similar to that of the base examples

Example 1

For boundary faces of zone "open_11", assign an inlet boundary condition prescribed from the meteo profile with automatic choice between inlet/ outlet according to the meteo profile.

  {
    int *iautom = cs_glob_bc_pm_info->iautom;
 
    const cs_zone_t *zn = cs_boundary_zone_by_name("open_11");
 
    for (cs_lnum_t e_idx = 0; e_idx < zn->n_elts; e_idx++) {
      const cs_lnum_t face_id = zn->elt_ids[e_idx];
 
      bc_type[face_id] = CS_INLET;
      iautom[face_id] = 1;
    }
  }

Example 3

For boundary faces of zone "inlet_3", assign an inlet boundary condition. Here, all other variables prescribed from the meteo profile are assumed to be managed by the GUI, except for dynamic variables which are prescribed with a rough log law.

  {
    const cs_lnum_t n_b_faces = domain->mesh->n_b_faces;
    const cs_real_3_t *restrict b_face_cog
      = (const cs_real_3_t *)domain->mesh_quantities->b_face_cog;
 
    const cs_real_t d2o3 = 2./3;
 
    /* Parameters for the analytical rough wall law (neutral) */
    const cs_real_t rugd = 0.10;
    const cs_real_t zref = 10.0;
    const cs_real_t xuref = 10.0;
 
    const cs_zone_t *zn = cs_boundary_zone_by_name("inlet_3");
 
    for (cs_lnum_t e_idx = 0; e_idx < zn->n_elts; e_idx++) {
 
      const cs_lnum_t face_id = zn->elt_ids[e_idx];
      bc_type[face_id] = CS_INLET;
 
      /* Dynamic variables are prescribed with a rough log law;
         note: using functions from the `cs_turbulence_bc` series
         is preferrable when the appropriate function is available. */
      const cs_real_t zent = b_face_cog[face_id][2];
 
      const cs_real_t ustar = cs_turb_xkappa*xuref/log((zref+rugd)/rugd);
      const cs_real_t xkent = cs_math_pow2(ustar)/sqrt(cs_turb_cmu);
      const cs_real_t xeent = cs_math_pow3(ustar)/cs_turb_xkappa/(zent+rugd);
 
      if (cs_glob_turb_model->itytur == 2) {
        CS_F_(k)->bc_coeffs->rcodcl1[face_id] = xkent;
        CS_F_(eps)->bc_coeffs->rcodcl1[face_id] = xeent;
      }
 
      else if (cs_glob_turb_model->itytur == 3) {
        for (int ii = 0; ii< 3; ii++)
          CS_F_(rij)->bc_coeffs->rcodcl1[n_b_faces*ii + face_id] = d2o3*xkent;
        for (int ii = 3; ii< 6; ii++)
          CS_F_(rij)->bc_coeffs->rcodcl1[n_b_faces*ii + face_id] = 0;
        CS_F_(eps)->bc_coeffs->rcodcl1[face_id] = xeent;
      }
 
      else if (cs_glob_turb_model->model == CS_TURB_V2F_PHI) {
        CS_F_(k)->bc_coeffs->rcodcl1[face_id] = xkent;
        CS_F_(eps)->bc_coeffs->rcodcl1[face_id] = xeent;
        CS_F_(phi)->bc_coeffs->rcodcl1[face_id] = d2o3;
        CS_F_(f_bar)->bc_coeffs->rcodcl1[face_id] = 0.0;
      }
 
      else if (cs_glob_turb_model->model == CS_TURB_K_OMEGA) {
        CS_F_(k)->bc_coeffs->rcodcl1[face_id] = xkent;
        CS_F_(omg)->bc_coeffs->rcodcl1[face_id] = xeent/cs_turb_cmu/xkent;
      }
 
      else if (cs_glob_turb_model->model ==  CS_TURB_SPALART_ALLMARAS) {
        CS_F_(nusa)->bc_coeffs->rcodcl1[face_id]
          = cs_turb_cmu*cs_math_pow2(xkent)/xeent;
      }
    }
  }

Example 4

Define a rough wall at boundary faces of zone 'b_5'.

  {
    /* Parameters for the analytical rough wall law (neutral) */
    const cs_real_t rugd = 0.10;
 
    cs_real_t *bpro_roughness = nullptr;
    cs_real_t *bpro_roughness_t = nullptr;
 
    if (cs_field_by_name_try("boundary_roughness") != nullptr)
      bpro_roughness = cs_field_by_name_try("boundary_roughness")->val;
 
    if (cs_field_by_name_try("boundary_thermal_roughness") != nullptr)
      bpro_roughness = cs_field_by_name_try("boundary_thermal_roughness")->val;
 
    const cs_zone_t *zn = cs_boundary_zone_by_name("b_5");
 
    for (cs_lnum_t e_idx = 0; e_idx < zn->n_elts; e_idx++) {
 
      const cs_lnum_t face_id = zn->elt_ids[e_idx];
      bc_type[face_id] = CS_ROUGHWALL;
 
      if (bpro_roughness != nullptr)
        bpro_roughness[face_id] = rugd;
 
      if (bpro_roughness_t != nullptr)
        bpro_roughness_t[face_id] = 0.01;
    }
  }