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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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RANS Wall Function

Posted 2011/12/29 22:14 GMT-5 Fluid & Heat, Computational Fluid Dynamics (CFD), Parameters, Variables, & Functions Version 4.2 2 Replies

Rui Silva
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Hi folks,

I am trying to modify the K-Epsilon model in comsol 4.2 so I can introduce some damping in the turbulence.

The idea is to have a Low Reynolds K-Epsilon, but different from the Low Reynolds that comes with COMSOL.

So far so good, however I have it a snag...I can't seem to be able to disable ou overwritte the Wall Function in the
K-Epsilon interface.

Is it possible? If so, can anyone give any advices on the subject.

Best Regards,

Rui
2 Replies Last Post 2011/12/31 11:11 GMT-5
Rui Silva
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Posted: 1 decade ago 2011/12/30 9:58 GMT-5
Anyone?

I could use some help on this one...

Cheers!
Anyone? I could use some help on this one... Cheers!
Jim Freels mechanical side of nuclear engineering, multiphysics analysis, COMSOL specialist
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Posted: 1 decade ago 2011/12/31 11:11 GMT-5
First, set up to view equations, then open the equation viewer in the model tree.

Then, you should be able to figure out all the variable names in the equations used in the pre-set module for the Low-Re k-e turbulence model.

Having figured out the variable names, you can either delete the existing variables you want to replace, or you can first rename the existing variables to something else that will not get used, then replace the renamed variables with your new model. I would opt for the 2nd replacement option because you can then still see how it is set up to use as an example for your replacement model.

Please post your new model. It sounds like a great idea for other folks to use (including myself).
First, set up to view equations, then open the equation viewer in the model tree. Then, you should be able to figure out all the variable names in the equations used in the pre-set module for the Low-Re k-e turbulence model. Having figured out the variable names, you can either delete the existing variables you want to replace, or you can first rename the existing variables to something else that will not get used, then replace the renamed variables with your new model. I would opt for the 2nd replacement option because you can then still see how it is set up to use as an example for your replacement model. Please post your new model. It sounds like a great idea for other folks to use (including myself).

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