Changes between Version 10 and Version 11 of doc/tec/sgs

Timestamp:

Nov 20, 2018 10:02:36 AM (6 years ago)

Author:

gronemeier

Comment:

--

doc/tec/sgs

@@ -1 @@
-= Turbulence closure =
+= Subgrid-scale Model =
+
+One of the main challenges in LES modeling is the turbulence closure. The filtering process yields four SGS covariance terms (see the first five equations Sect. [wiki:doc/tec/gov governing equations]) that cannot be explicitly calculated. In PALM, two different subgrid-scale models are available to parameterize the SGS terms:
+* [#deardorff_sgs Deardorff subgrid-scale model]
+* [#dynamic_sgs Dynamic subgrid-scale model]
+ which are described below.
+
+Selecting one of the available SGS models is done via the namelist parameter [/wiki/doc/app/inipar#turbulence_closure turbulence_closure]. 
+
 
 == Deardorff subgrid-scale model ==
 
-One of the main challenges in LES modeling is the turbulence closure. The filtering process yields four SGS covariance terms (see the first five equations Sect. [wiki:doc/tec/gov governing equations]) that cannot be explicitly calculated. In PALM, these SGS terms are parametrized using a 1.5-order closure after [#deardorff Deardorff (1980)]. PALM uses the modified version of [#moeng Moeng and Wyngaard (1988)] and [#saiki Saiki et al. (2000)]. The closure is based on the assumption that the energy transport by SGS eddies is proportional to the local gradients of the mean quantities and reads
+In PALM, the default SGS model uses a 1.5-order closure according to [#deardorff Deardorff (1980)]. PALM applies the modified version of [#moeng Moeng and Wyngaard (1988)] and [#saiki Saiki et al. (2000)]. The closure is based on the assumption that the energy transport by SGS eddies is proportional to the local gradients of the mean quantities and reads
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 #!Latex