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Acceptable courant number for an instationary simulation of natural convection in a f

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Old   May 23, 2013, 04:52
Default 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 :
Cooling behavior of liquid aluminum in a closed container
Attached Images
File Type: jpg test@11400_Residuals.jpg (52.2 KB, 21 views)
File Type: jpg test@11400_convective_courant_1.jpg (16.6 KB, 19 views)
File Type: jpg test@11400_convective_courant_2.jpg (19.5 KB, 16 views)
File Type: jpg test@11400_courant_Maximum.jpg (29.6 KB, 12 views)
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Old   May 30, 2013, 05:01
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can no one give me some advice?
please?
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