[RegCNET] Model not working after a particular time

[jagadish karmacharya]

Dear Dilip,

I used to face similar problem. I think this error arise due to convective instability. A common work around is to decrease the time step and restart the model. If run goes well you can stop the model after few days run and restart it with original time step if you want to lose computational time.

Wish you Happy New Year!
Jagadish 

Dilip Ganguly <dganguly at prl.res.in> wrote: Hello everyone,

My Greetings to you all on Christmas!

I wanted to run RegCM3 for the year 2004 over the south Asian domain. I 
choose an initial spin up time of two months. That means I started my 
simulations from 1st Nov. 2003. Simulations started normally and worked 
upto 1st February 2004. However after this it started showing problem in 
calculating 1st and 2nd time deriv of ps and I was getting following 
message on the screen

     at day =   93.0286, ktau =      12300 :  1st, 2nd time deriv of ps =  
NaN        NaN        ,  no. of points w/convection =    0
 BATS variables written at   2004020203   180.000000000000
     at day =   93.1589, ktau =      12350 :  1st, 2nd time deriv of ps =  
NaN        NaN        ,  no. of points w/convection =    0
 OUT-history written date =    2004020206.00000
 BATS variables written at   2004020206  0.000000000000000E+000
 Writing rad fields at ktau =        12384  2004020206
 BCs are ready from   2004020206   to   2004020212
     at day =   93.2891, ktau =      12400 :  1st, 2nd time deriv of ps =  
NaN        NaN        ,  no. of points w/convection =    0

---------------------------------------------------------------------
At this point I stopped the model and restarted it. However the problem 
is not solved I am getting following message again

 ******* OPENING NEW OUTPUT FILES:  2004020200
 OPENING NEW OUT FILE: output/ATM.2004020200
 OPENING NEW BAT FILE: output/SRF.2004020200
 OPENING NEW RAD FILE: output/RAD.2004020200
     at day =   93.0286, ktau =      12300 :  1st, 2nd time deriv of ps =  
NaN        NaN        ,  no. of points w/convection =    0

--------------------------------------------------------------------

Can anyone tell me why is this problem arising and how to overcome it?

Thanks in advance.

Dilip. 
  
     ---------------------------------------------------------------------
        DILIP GANGULY                               
        Postdoctoral Fellow                     
        Space And Atmospheric Sciences Division      
        Physical Research Laboratory                
        Ahmedabad 380009
 Gujarat, India
        Phone: +91 79 26314558 (Laboratory)    
               +91 79 26300505 (Hostel)
 Fax:   +91 79 26314659
 Alternate Email: ganguly.dilip at gmail.com          
            Visit me at   http://www.prl.res.in/~dganguly
     ---------------------------------------------------------------------




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