Changes between Version 38 and Version 39 of 2009WP/2009Stream3

Timestamp:

2009-11-03T17:44:23+01:00 (14 years ago)

Author:

acc

Comment:

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2009WP/2009Stream3

@@ -159 +159 @@
         '''Status:''' A ticket have benn submitted on the track ( #337 ). NVTK and doc will coming for the next release.
 
+=== S3.2-m — Bottom Friction ===
+        '''Motivation:'''Ticket #233 identified problems with the bottom friction and its implicit treatment within the vertical diffusion term. An explicit form for the bottom friction term was proposed but concerns were raised over the implications for numerical stability.[[BR]]  
+        '''Status:''' An explicit treatment of the bottom friction term has been implemented, tested and submitted. The tendency due to bottom friction is explicitly calculated and added to the general momentum trend in a new routine (dynbfr.F90). Free-slip, linear and non-linear                 bottom friction parameterisations are supported but the no-slip option has been suppressed. Stability concerns have been addressed by formally checking the derived bottom friction coefficient in dynbfr.F90 and limiting values where necessary. With the time-splitting solver, the vertically averaged tendency due to bottom friction is computed explicitly each barotropic timestep. This value is used implicitly and so does not need to be limited for stability reasons (important for tidal applications where the barotropic contribution dominates). NVTK checks have been passed and all code and documentation has been sent to Paris for inclusion in tagged release 3.2 (NEMO-Southampton)
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