Time step modification

Time step modification

We do a computation restart with an adaptive (variable in time and constant in space) or local (variable in time and space) time step. We want to modify the time step read from the restart file (in order to overcome a too slow evolution for instance).

Initialization

The following block can be added to cs_user_initialization.c to do this:

  if (! cs_restart_present())      /* Useful only for a restart */
    return;

  const cs_lnum_t n_cells = domain->mesh->n_cells;

  cs_field_t *f = cs_field_by_name("dt");

  for (cs_lnum_t cell_id = 0; cell_id < n_cells; cell_id++) {
    f->val[cell_id] *= 10.;
  }