[RegCNET] problem running model with 45 km resolution

[Rauscher Sara A]

Hi,
What values of dt did you try? You may have to decrease the time step
further. The rule of thumb is that dt=3x the horizontal resolution. 150
usually works for 45km, but it also depends on the domain itself. I'd
try dt=90 or dt=100.
sara
Satyaban Bishoyi Ratna wrote:
>
>  
> Dear RegCM users,
>   I am trying to make one month model integration with
> 45 km resolution and having 125 (N-S) and 144 (E-W)
> grid points but I am not able to run it properly. I am getting
> the error "...nan.....nan..." during run time of the model.
> I tried with the timestep and other set up in 'regcm.in' as per
> the suggestion of RegCM document but it is not working.
> Because as per the document the set up for 45 km resolution is
> radfrq  =    30.,
> abemh  =    18.,
> abatm  =  300.,
> dt      =  150.,
> but it is not working.I tried the run with the changing number of
> 'abatm' and 'dt' but no success.
> When I tried the integartion with 60 km resolution with same domain
> size, it works well.
> Please tell me what is going wrong when I am trying to make 45 km
> resolution. What are the things I need to change.
>   Thanking you.
>
> Best regards
> Satyaban Bishoyi Ratna
>
> ****************************************************************************************************
>
> Satyaban Bishoyi Ratna
> Research Scholar
> Department of Meteorology and Oceanography
> Andhra University
> Visakhapatnam - 530003
> Andhra Pradesh, India
> Cell: 94403 30367
> E-mail: satyaban_2001 at rediffmail.com
>        satyaban14 at yahoo.co.in
>        
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>
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-- 

Dr. Sara A. Rauscher
Earth System Physics Section 
The Abdus Salam International Centre for Theoretical Physics
Strada Costiera 11 
34014 Trieste ITALY
ph: +39 040 2240 225 fax: +39 040 2240 449
email: srausche at ictp.it