Dear Pyarimohan,

The DT depends on the resolution of your simulation. What is the value for ds in your regcm.in file? and what is the value of dt you are using?

Check here for more information: http://eforge.escience-lab.org/gf/project/regcm/wiki/?pagename=RegCM-4+timesteps

I am currently running simulations with 50 km resolution, and am using a 30 s time step.

Regards,

James

On 6 January 2011 13:21, pyarimohan maharana <chiku777rock@gmail.com> wrote:
Dear all,
i am using intel compiler (10.1.011) for running RegCM4. i was able to simulate for few years. but recently when i am running RegCM4.0, it is showing CFL violation and suggests to decrease DT.
i decreased the DT to smaller values  but the same problem is coming again and again.





 fac =            2   60.0000000000000
 Writing output files in direct access format
 
 ******* OPENING NEW OUTPUT FILES:  1990060100
 OPENING NEW OUT FILE: /home/pmaharana/RCM4/output//ATM.1990060100
 OPENING NEW SRF FILE: /home/pmaharana/RCM4/output//SRF.1990060100
 OPENING NEW RAD FILE: /home/pmaharana/RCM4/output//RAD.1990060100
 OUT-history written date =    1990060100.00000
 LAND variables written at   1990060100   2.50000000000000
 Writing rad fields at ktau =            1  1990060100
 WHUUUUBBBASAAAGASDDWD!!!!!!!!!!!!!!!!
 No more atmosphere here....
 CFL violation detected, so model STOP
 #####################################
 #            DECREASE DT !!!!       #
 #####################################
  -------------- FATAL CALLED ---------------
  Fatal in file: tend.F90 at line:   2280
  CFL VIOLATION
  -------------------------------------------
rank 0 in job 1  climate.jnu.ac.in_60366   caused collective abort of all ranks
  exit status of rank 0: return code 1
 


Please help
Thank in advance

Pyarimohan maharana


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