[RegCNET] Floating point exception

[Wm. J. Gutowski]

Armelle:
	I agree with Gao, so long as your change in time step is not 
too big (i.e., not something like a factor of  4 or 5).  There are 
small differences that occur in runs with different time steps, but 
unless you are continually hovering close to violating the CFL 
condition, then they should not be significant differences.
	If you have the time, you might want to run some part of your 
simulations with both time steps to document the size of the 
differences, so you can demonstrate that indeed the time-step change 
was not critical.

Cheers,
Bill

At 9:56 PM +0800 06.07.24, <gaoxj at cma.gov.cn> wrote:
>You can restart the model using a smaller time step for, say 1 
>month, then go back to the normal dt for the rest of the simulation. 
>Don't have to start the simulation from beginning.
>
>Gao
>
>----- Original Message -----
>>From: "Armelle Reca C. Remedio" <melle at observatory.ph>
>To: <regcnet at lists.ictp.it>
>Sent: Monday, July 24, 2006 9:51 PM
>Subject: [RegCNET] Floating point exception
>
>
>Good day!
>
>I have finished more than 75% of my 5-year simulation and i encountered the
>floating point exception error. My question is, at this point, can i just
>reduce the time step and do a restart? or do i have to do the simulation from
>the beginning with the reduced time step?
>
>thanks!
>
>sincerely,
>armelle
>
>
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
William J. Gutowski, Jr.
3021 Agronomy Hall
Dept. of Geological and
      Atmospheric Sciences
Iowa State University
Dept. of Agronomy
Ames, Iowa  50011-1010

gutowski at iastate.edu
Tel:1-515-294-5632
Fax:1-515-294-2619
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