[RegCNET] Grell instability

[Graziano Giuliani]

On 11/25/14 22:20, Michael Notaro wrote:
> I am attempting to run a 40-km simulation of RegCM-4.4.4-CLM4.5centered on China using NCEP-NCAR Reanalysis on NCAR Yellowstone. 
> Please see my attached namelist, test_001.in. I am getting the following error
> shortly after the run starts. Any suggestions? 
> 
> 
> I gave my namelist to another scientist. He ran it for China and it crashed.
> Then he applied it over another region (SE United States) and it didn't crash. 
[...]

Michael, the Himalaya is the problem here... The gradient is too strong,
and a small dt must be used in your case. I completed your test case
here with dt=60.
We know that for both Himalaya and Andes the dt must be decreased well
below the expected "safe" rule of dt ~= 3*dx.

Ciao!

Graziano.


-- 
Graziano Giuliani - Earth System Physics Section
The Abdus Salam International Centre for Theoretical Physics
Strada Costiera 11 - I - 34151 Trieste Italy