[Wrf-users] cfl error in very complex topography

[David Ovens]

Jorge,

I see you have tried many of the recommended steps.  Have you tried
setting epssm to a larger number?  For my 4th domain, 0.2 is
sufficient 
 epssm       = 0.1, 0.1, 0.1, 0.2,
but you might want as much as 0.4 or even higher.  Change that in the
&dynamics section of your namelist.input file, rerun real.exe, and try
your run again.

David
-- 
David Ovens		 e-mail: ovens at atmos.washington.edu
Research Meteorologist    phone: (206) 685-8108
Dept of Atm. Sciences      plan: Real-time MM5 forecasting for the
Box 351640                        Pacific Northwest
University of Washington          http://www.atmos.washington.edu/mm5rt
Seattle, WA  98195               Weather Graphics and Loops
                                  http://www.atmos.washington.edu/~ovens/loops


On Fri, Jun 14, 2013 at 01:36:11PM -0400, Jorge Alejandro Arevalo Borquez wrote:
> Dears,
> 
> I am trying to run WRF over Central Chile. I am using 4 nested domains, the
> finner one has 1 km of horizontal resolution with 50 vertical levels.
> Domains includes Aconcagua mountain wich is about 6900 masl.
> 
> When I run wrf I get cfl errors at few seconds after start in grid-points
> near to Aconcagua, but wrf crash in the call to radiation parametrization.
> 
> I tried to decrease time-step, use adaptive time-step, edit GEOGRID.TBL  to
> use 1-2-1 smooth option, change my set of parametrization. Even I tried to
> edit geog data and apply a simple filter to smooth topography near
> aconcagua region. All efforts has concluded with the same cfl errors.
> 
> Any advice is welcome
> 
> Regards
> 
> 
> 
> Atentamente
> Jorge Ar?valo B?rquez
> Profesor Auxiliar
> Coordinador LMA-UV
> Departamento de Meteorolog?a
> Universidad de Valpara?so
> 56-32-2508710

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