Changes between Version 2 and Version 3 of user/gm/Misc.Items

Timestamp:

2009-06-14T16:57:31+02:00 (15 years ago)

Author:

gm

Comment:

--

user/gm/Misc.Items

@@ -134 +134 @@
 
 ----
-== 6.  others... ==
+== 6.  Revised ZDF ==
+
+With zdftke2 in the process of becoming the standard turbulent closure scheme, a wide horizontal stencil is no more required to compute avmu and avmv. They can be evaluated by just using the 2 neighbouring avm at w-point. Therefore, all zdf.. can be modified to compute only momentum and tracer turbulent mixing coefficient at w-point. avmu, avmv can be removed and in dynzdf_exp and dynzdf_imp a averaged value of avm is used instead of avmu and avmv arrays.[[BR]]
+This will save between 6 and 12 call to lbc_lnk by time step ![[BR]]
+The pending issue is that the algorithm of the  KPP scheme should be revisited so that it becomes stable without any averaging. Similarly for the GLS scheme, but this should be OK, as the turbulent closure available in GLS come from Burchard, the guy who has found  how to stabilise the TKE scheme without a wide horizontal averaging procedure.
+
+
+[[BR]]
+
+----
+== 7.  others... ==