Possible epsilon influence on k-omega-SST?

vainilreb · January 23, 2013, 04:54

Hi everyone,

from time to time I'm observing an influence of the "epsilon" file on my calculation's convergence, although I'm using the k-omega-SST model.

When doing influence studies I copy my old cases and change only some parameters, like e.g. the inlet flow. When I don't adapt any further files but k and omega, my calculation would crash after several seconds. Then I try to fix it by adapting epsilon to the new inlet flow and everything works fine.

Has anyone ever encountered the same phenomenon? I always wonder if this is even possible - as far as I believe to understand OpenFOAM's turbulence modelling it should not?

The solver in use is sprayFoam and YES, I am sure that the turbulence model is set to k-omega-SST.

Best regards, Robert

immortality · January 23, 2013, 05:32

i had a problem like you but somewhat different.in my case an error always displayed on R folder(my turbulence model is kOmegaSST too) when i deleted it never that error displayed.
I have a question like you.why these folders affect others when they should not be used?

January 23, 2013, 04:54	Possible epsilon influence on k-omega-SST?	#1
vainilreb Member Robert Join Date: Aug 2012 Location: Berlin Posts: 74 Rep Power: 13	Hi everyone, from time to time I'm observing an influence of the "epsilon" file on my calculation's convergence, although I'm using the k-omega-SST model. When doing influence studies I copy my old cases and change only some parameters, like e.g. the inlet flow. When I don't adapt any further files but k and omega, my calculation would crash after several seconds. Then I try to fix it by adapting epsilon to the new inlet flow and everything works fine. Has anyone ever encountered the same phenomenon? I always wonder if this is even possible - as far as I believe to understand OpenFOAM's turbulence modelling it should not? The solver in use is sprayFoam and YES, I am sure that the turbulence model is set to k-omega-SST. Best regards, Robert

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January 23, 2013, 05:32		#2
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	i had a problem like you but somewhat different.in my case an error always displayed on R folder(my turbulence model is kOmegaSST too) when i deleted it never that error displayed. I have a question like you.why these folders affect others when they should not be used?