Atmospheric model

Introduction

User functions for the atmospheric model.

Atmospheric definition

Activate 1-D radiative transfer model

Is define in cs_user_model function

  cs_atmo_1d_rad_t *at_1d_rad = cs_glob_atmo_1d_rad;
 
  /* Activate 1-D radiative transfer model */
  at_1d_rad->radiative_model_1d = 1;
 
  /* Specify the number of verticals and the number of levels.
   * The mesh levels can be specified in cs_user_parameters function.
   * */
  at_1d_rad->nvert = 1;
  at_1d_rad->nlevels = 49;//n_faces -1
  at_1d_rad->nlevels_max = at_1d_rad->nlevels;
 
  /* Complete 1-D mesh to ztop in case of radiative transfer */
  if (at_1d_rad->nvert > 0) {
    cs_real_t zvmax = 1975.;/* top of the domain */
    cs_real_t ztop = 11000.;/* top of the troposphere */
    for (cs_real_t zzmax = (((int) zvmax)/1000)*1000.;
        zzmax <= (ztop -1000);
        zzmax += 1000.) {
      (at_1d_rad->nlevels_max)++;
    }
 
  }

define 1-D radiative transfer mesh

Is define in cs_user_parameters function

  /* Example: define 1-D radiative transfer mesh for
   * the atmospheric module */
  /*-----------------------------------------------------------------*/
  cs_atmo_option_t *at_opt = cs_glob_atmo_option;
  cs_atmo_1d_rad_t *at_1d_rad = cs_glob_atmo_1d_rad;
 
  /* Initializing the ground table of each vertical grid */
 
  if (at_opt->ground_model != 0) {
    for (int i = 0; i < at_1d_rad->nvert; i++) {
      at_1d_rad->albedo0[i] = 0.25;
      at_1d_rad->emissi0[i] = 0.965;
      at_1d_rad->temp0  [i] = 14.77;
      /* NB automatic computation of at_1d_rad->theta0 [i] */
      at_1d_rad->qw0    [i] = 0.0043;
      at_1d_rad->p0     [i] = 102300.;
      at_1d_rad->rho0   [i] = 1.23;
    }
 
    /* Modify the ground parameters if activated */
    at_opt->ground_cat_roughness[3] = 0.0012;
    at_opt->ground_cat_thermal_inertia[3] = 1.7e-5;
    at_opt->ground_cat_thermal_roughness[3] = 0.0012;
  }
 
  /* Example: define 1-D radiative transfer mesh for
   * the atmospheric module */
  /*-----------------------------------------------------------------*/
 
  if (at_1d_rad->radiative_model_1d > 0) {
    at_1d_rad->zq[0 ] = 0.;
    at_1d_rad->zq[1 ] = 10.;
    at_1d_rad->zq[2 ] = 31.;
    at_1d_rad->zq[3 ] = 53.;
    at_1d_rad->zq[4 ] = 77.;
    at_1d_rad->zq[5 ] = 102.;
    at_1d_rad->zq[6 ] = 128.;
    at_1d_rad->zq[7 ] = 156.;
    at_1d_rad->zq[8 ] = 185.;
    at_1d_rad->zq[9 ] = 214.;
    at_1d_rad->zq[10] = 246.;
    at_1d_rad->zq[11] = 278.;
    at_1d_rad->zq[12] = 311.;
    at_1d_rad->zq[13] = 346.;
    at_1d_rad->zq[14] = 381.;
    at_1d_rad->zq[15] = 417.;
    at_1d_rad->zq[16] = 454.;
    at_1d_rad->zq[17] = 493.;
    at_1d_rad->zq[18] = 531.;
    at_1d_rad->zq[19] = 571.;
    at_1d_rad->zq[20] = 612.;
    at_1d_rad->zq[21] = 653.;
    at_1d_rad->zq[22] = 695.;
    at_1d_rad->zq[23] = 737.;
    at_1d_rad->zq[24] = 781.;
    at_1d_rad->zq[25] = 824.;
    at_1d_rad->zq[26] = 869.;
    at_1d_rad->zq[27] = 914.;
    at_1d_rad->zq[28] = 959.;
    at_1d_rad->zq[29] = 1005.;
    at_1d_rad->zq[30] = 1051.;
    at_1d_rad->zq[31] = 1098.;
    at_1d_rad->zq[32] = 1146.;
    at_1d_rad->zq[33] = 1193.;
    at_1d_rad->zq[34] = 1241.;
    at_1d_rad->zq[35] = 1290.;
    at_1d_rad->zq[36] = 1339.;
    at_1d_rad->zq[37] = 1388.;
    at_1d_rad->zq[38] = 1438.;
    at_1d_rad->zq[39] = 1487.;
    at_1d_rad->zq[40] = 1538.;
    at_1d_rad->zq[41] = 1588.;
    at_1d_rad->zq[42] = 1639.;
    at_1d_rad->zq[43] = 1690.;
    at_1d_rad->zq[44] = 1741.;
    at_1d_rad->zq[45] = 1793.;
    at_1d_rad->zq[46] = 1844.;
    at_1d_rad->zq[47] = 1896.;
    at_1d_rad->zq[48] = 1949.;
    at_1d_rad->zq[49] = 2001.;
    /* Complete 1-D mesh to ztop in case of radiative transfer */
    if (at_1d_rad->nvert > 0) {
      int i = at_1d_rad->nlevels;
      cs_real_t zvmax = 2001.;/* top of the domain */
      cs_real_t ztop = 11000.;/* top of the troposphere */
      for (cs_real_t zzmax = (((int) zvmax)/1000)*1000.;
           zzmax <= (ztop -1000);
           i++) {
        zzmax += 1000.;
        at_1d_rad->zq[i] = zzmax;
        bft_printf("Atmo, rad 1D zq[%d]=%f\n", i+1, at_1d_rad->zq[i]);
      }
    }
  }
 
  /* Initialize position of each vertical */
  for (int i = 0; i < at_1d_rad->nvert; i++) {
    at_1d_rad->xy[0 * at_1d_rad->nvert + i] = 50.; /* X coord */
    at_1d_rad->xy[1 * at_1d_rad->nvert + i] = 50.; /* Y coord */
    at_1d_rad->xy[2 * at_1d_rad->nvert + i] = 1.; /* kmin in case of
                                                             non-flat terrain */
  }

Data Entry for the atmospheric ground model

To activate the model, the user has to set the and to specify the zone id on which the ground model is applied in cs_user_parameters.cpp, routine cs_user_model:

  at_opt->ground_model = 1; /* Switch on ground model */
 
  /* Set the number of predefined categories (+1 which is the default one)
   * among:
   *  - CS_ATMO_GROUND_5_CAT
   *  - CS_ATMO_GROUND_7_CAT
   * */
  at_opt->ground_cat= CS_ATMO_GROUND_5_CAT; /* Switch on ground model */
 
  /* Specify the boundary zone which is modeled */
  at_opt->ground_zone_id = cs_boundary_zone_by_name("Sol")->id;

Initialization of atmospheric

The user has to specify the percentage of each category for all faces of the ground zone in cs_user_initialization.cpp:

  if (cs_glob_atmo_option->ground_zone_id > -1) {
    const cs_zone_t *z
      = cs_boundary_zone_by_id(cs_glob_atmo_option->ground_zone_id);
 
    cs_field_t *f = cs_field_by_name("atmo_ground_percentages");
 
    for (cs_lnum_t elt_id = 0; elt_id < z->n_elts; elt_id++) {
      for (cs_lnum_t ground_id = 0; ground_id < f->dim; ground_id++)
        f->val[ground_id + f->dim * elt_id] = 0.;
 
      /* 100% of mineral */
      f->val[4 + f->dim * elt_id] = 100.;
    }
 
  }