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Rans

Posted August 31, 2020 at 16:08 by MikeBravo

Quote:
Originally Posted by vinerm View Post
That's a wrong notion that RANS or EVM models are introduced to get faster results or are expected to be used with coarse mesh. There is no such assumption behind development of these models. The only assumption in EVM is that the turbulence is isotropic and non-EVM RANS, such as, RSM don't even have that assumption.

And when it comes to wall treatment, it is not directly linked with turbulence model; even LES requires wall treatment. y^+ is a non-dimensional (Reynolds) number and for almost all industrial fluids, theoretically as well as experimentally, it is found that u^+ = y^+ up to y^+ of 5. And if it is linear within this limit, it does not matter if you have 10 points or just 1 point, the line would be same. So, y^+ being smaller than 1 is an overkill and does not help within anything.

Boundary conditions for both k and \varepsilon at the wall is 0.
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