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-   -   Acceptable courant number for an instationary simulation of natural convection in a f (http://www.cfd-online.com/Forums/star-ccm/118228-acceptable-courant-number-instationary-simulation-natural-convection-f.html)

§$§eth May 23, 2013 04:52

Acceptable courant number for an instationary simulation of natural convection in a f
 
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Hi @ all,

i have the following questions:

what is the maximal acceptable courant number for an instationary simulation of natural convection in a fluid region? what kind of literature would you suggest? i have a hard time finding literature that acknowledge this matter properly.

are there any ways to decrease the courant number besides decreasing the time step? because i have to simulate over a pretty long time span and a small time step would be a big nuisance

the maximum courant number in my actual simulation is over 110, the time step is 1 sec, the inner iterations are set to 20 and i am pretty sure the courant number is a way too high, the residuals look pretty good i think

thanks for you help pics are attached

for more information of my simulation :
http://www.cfd-online.com/Forums/sta...container.html

§$§eth May 30, 2013 05:01

can no one give me some advice?
please?


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