OpConvQuickIJKScalar.tpp

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#ifndef OpConvQuickIJKScalar_TPP_included
#define OpConvQuickIJKScalar_TPP_included
 
#include <OpConvQuickIJKScalar.h>
 
#ifndef OpConvQuickIJKScalar_included
#error __FILE__ should only be included from corresponding header
#endif
 
#include <IJK_Field.h>
 
template <DIRECTION _DIR_>
 
void OpConvQuickIJKScalar_double::compute_flux_(IJK_Field_local_double& resu, const int k_layer)
{
  if(_DIR_==DIRECTION::Z)
    {
      // The previous layer of curv and fram values might have been computed already
      if (stored_curv_fram_layer_z_ != k_layer-1)
        {
          compute_curv_fram(_DIR_, k_layer-1);
          shift_curv_fram(tmp_curv_fram_);
        }
    }
  compute_curv_fram(_DIR_, k_layer);
 
  if (is_grad_ && !is_flux_)
    {
      input_velocity_x_ = input_field_;
      input_velocity_y_ = input_field_;
      input_velocity_z_ = input_field_;
    }
 
  ConstIJK_double_ptr velocity_dir(get_input_velocity(_DIR_), 0, 0, k_layer);
  ConstIJK_double_ptr input_field(*input_field_, 0, 0, k_layer);
  ConstIJK_double_ptr curv_values(tmp_curv_fram_, 0, 0, 1); /* if z direction, "left" will be in layer 0 */
  ConstIJK_double_ptr fram_values(tmp_curv_fram_, 0, 0, 3); /* if z direction, "left" is in layer 2 */
  IJK_double_ptr resu_ptr(resu, 0, 0, 0);
  const int nx = _DIR_==DIRECTION::X ? input_field_->ni() + 1 : input_field_->ni();
  const int ny = _DIR_==DIRECTION::Y ? input_field_->nj() + 1 : input_field_->nj();
 
  const double delta_xyz = _DIR_==DIRECTION::Z ? (channel_data_.get_delta_z()[k_layer-1] + channel_data_.get_delta_z()[k_layer]) * 0.5 : channel_data_.get_delta((int)_DIR_);
  double surface = 1.;
  if (!is_grad_ || is_flux_)
    surface = channel_data_.get_surface(k_layer, 1, (int) _DIR_);
  else
    {
      switch(_DIR_)
        {
        case DIRECTION::X:
          surface = 1 / channel_data_.get_delta_x();
          break;
        case DIRECTION::Y:
          surface = 1 / channel_data_.get_delta_y();
          break;
        case DIRECTION::Z:
          break;
        }
    }
 
  if(_DIR_==DIRECTION::Z)
    {
      // Are we on the wall ?
      const int global_k_layer = k_layer + channel_data_.offset_to_global_k_layer();
      // global index of the layer of flux of the wall
      //  (assume one walls at zmin and zmax)
      const int first_global_k_layer = 0;
      const int last_global_k_layer = channel_data_.nb_elem_k_tot();
 
      // GB 21/12/2020 : Similarly to velocity, we make the same adjustments.
      // if (global_k_layer == first_global_k_layer || global_k_layer == last_global_k_layer) {
      // ie (i) replace the former "==" by "<=" and ">=" to be identic to the condition in OpCentre4IJK
      // and (ii) add the condition on perio_k
      if (!perio_k_ && (global_k_layer <= first_global_k_layer || global_k_layer >= last_global_k_layer))
        {
          // We are on (or worse inside) the wall, zero flux
          putzero(resu);
          return;
        }
    }
 
  const double velocity_frame = velocity_frame_of_reference_[(int) _DIR_];
 
  const double delta_xyz_squared_over_8 = delta_xyz * delta_xyz * 0.125;
  const int imax = nx;
  const int jmax = ny;
  const int vsize = Simd_double::size();
  for (int j = 0; ; j++)
    {
      for (int i = 0; i < imax; i += vsize)
        {
          Simd_double velocity;
          if (!is_grad_ || is_flux_)
            velocity_dir.get_center(i, velocity);
          Simd_double T0, T1; // scalar value at left and at right of the computed flux
          Simd_double fram0, fram1;
          Simd_double curv0, curv1;
          input_field.get_left_center(_DIR_, i, T0, T1);
          fram_values.get_left_center(_DIR_, i, fram0, fram1);
          curv_values.get_left_center(_DIR_, i, curv0, curv1);
          Simd_double fram = SimdMax(fram0, fram1);
          Simd_double curv     = SimdSelect<double>(velocity, 0., curv1, curv0);
          Simd_double T_amont = SimdSelect<double>(velocity, 0., T1 /* if velocity < 0 */, T0 /* if velocity > 0 */);
          Simd_double flux     = (T0 + T1) * 0.5 - delta_xyz_squared_over_8 * curv;
          flux         = ((1. - fram) * flux + fram * T_amont) * (velocity - velocity_frame) * surface;
          resu_ptr.put_val(i, flux);
        }
      // do not execute end_iloop at last iteration (because of assert on valid j+1)
      if (j+1==jmax)
        break;
      input_field.next_j();
      velocity_dir.next_j();
      fram_values.next_j();
      curv_values.next_j();
      resu_ptr.next_j();
    }
 
  if(_DIR_==DIRECTION::Z)
    {
      // store curv and fram for next layer of fluxes in z direction
      shift_curv_fram(tmp_curv_fram_);
      stored_curv_fram_layer_z_ = k_layer;
    }
}
#endif