Changes between Version 330 and Version 331 of doc/app/initialization_parameters

Timestamp:

Jun 7, 2017 12:33:31 PM (8 years ago)

Author:

suehring

Comment:

--

doc/app/initialization_parameters

@@ -927 +927 @@
 '' 'pw-scheme' ''\\\\
       The scheme of Piacsek and Williams (1970, J. Comp. Phys., 6, 392-405) with central differences in the form C3 is used.
+'' 'up-scheme' ''\\\\
+      First-order upstream scheme. The upstream scheme is guarantees only a stable solution in combination with [#timestep_scheme timestep_scheme] = '' 'euler' ''. Note, this scheme is very diffusive, and hence, not well-suited for turbulence-resolving simulations. 
 }}}
 |----------------
@@ -1145 +1147 @@
       The Bott scheme modified by Chlond (1994, Mon. Wea. Rev., 122, 111-125). This is a conservative monotonous scheme with very small numerical diffusion and therefore very good conservation of scalar flow features. The scheme, however, is computationally very expensive both because it is expensive itself and because it does (so far) not allow specific code optimizations (e.g. cache optimization). Choice of this scheme forces the Euler time step scheme to be used for the scalar quantities. For output of horizontally averaged profiles of the resolved / total heat flux, [../d3par#data_output_pr data_output_pr] = '' 'w*pt*BC' '' / '' 'wptBC' '' should be used, instead of the standard profiles ('' 'w*pt*' '' and '' 'wpt' '') because these are too inaccurate with this scheme. However, for subdomain analysis (see [#statistic_regions statistic_regions]) exactly the reverse holds: here '' 'w*pt*BC' '' and '' 'wptBC' '' show very large errors and should not be used.\\\\
       This scheme is not allowed for non-cyclic lateral boundary conditions (see [#bc_lr bc_lr] and [#bc_ns bc_ns]) and requires that [#loop_optimization loop_optimization] = '' 'vector' '' is set.\\\\
-A differing advection scheme can be chosen for the subgrid-scale TKE using parameter [#use_upstream_for_tke use_upstream_for_tke].
+'' 'up-scheme' ''\\\\
+      First-order upstream scheme. The upstream scheme is guarantees only a stable solution in combination with [#timestep_scheme timestep_scheme] = '' 'euler' ''. Note, this scheme is very diffusive, and hence, not well-suited for turbulence-resolving simulations.  \\\\
+Remark: Independent on the choice of 'scalar_advec' and [#timestep_scheme timestep_scheme], a different advection scheme can be chosen for the subgrid-scale TKE using parameter [#use_upstream_for_tke use_upstream_for_tke].
 }}}
 |----------------