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Old   August 25, 2014, 12:35
Default Wall functions
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Иван Сташко
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In the thread "Near Wall Turbulence in CFX", ghorrocks writes:
Well, put it this way:

The k-e turbulence model is degenerate at the walls, meaning you have to do something to define it at the walls. So you define wall functions and off you go.

The k-omega model is defined at the walls and so has no need for any special treatment. You can simply integrate it to the wall. So wall functions do not exist.

So you can compare a k-e model with wall functions to a k-omega model without. So you are not only comparing wall functions but turbulence models.

It is said that "wall lift-off in viscous units" which some software reports at the end of the solution, should match specific parameters; and if it does not, then it is said that the wall functions have been violated and the solution is incorrect.

Is it correct to say that this parameter is only applicable to the k-epsilon model and not the k-omega model?

Thank you.
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