1341 | | By default, the advection scheme and the time step scheme to be used for the subgrid-scale TKE are set by the initialization parameters [#scalar_advec scalar_advec] and [#timestep_scheme timestep_scheme], respectively. '''use_upstream_for_tke''' = ''.T.'' forces the Euler-scheme and the upstream-scheme to be used as time step scheme and advection scheme, respectively. By these methods, strong artificial near-surface vertical gradients of the subgrid-scale TKE, as they will be caused by non-diffusive advection schemes, are avoided. '''use_upstream_for_tke''' = ''.T.'' is required when subgrid-scale velocities are used for advection of particles (see particle package parameter [../parpar#use_sgs_for_particles use_sgs_for_particles]) and [#scalar_advec scalar_advec] /= 'ws-scheme'. |
| 1341 | By default, the advection scheme and the time step scheme to be used for the subgrid-scale TKE are set by the initialization parameters [#scalar_advec scalar_advec] and [#timestep_scheme timestep_scheme], respectively. '''use_upstream_for_tke''' = ''.T.'' forces the Euler-scheme and the upstream-scheme to be used as time step scheme and advection scheme, respectively. By these methods, strong artificial near-surface vertical gradients of the subgrid-scale TKE, as they will be caused by non-diffusive advection schemes, are avoided. '''use_upstream_for_tke''' = ''.T.'' is required when subgrid-scale velocities are used for advection of particles (see particle package parameter [../particle_parameters#use_sgs_for_particles use_sgs_for_particles]) and [#scalar_advec scalar_advec] /= 'ws-scheme'. |