[Ali Blues]

Hi,
I have a question regarding the description of the wall boundary condition for the turbulent variables (e.g., nut, k, omega for komegaSST) in the tutorial case:
tutorials/incompressible/SRFSimpleFoam/mixer/

In 0/nut, for the innerWall for example, we have:

innerWall
    {
        type            nutkWallFunction;
        U               Urel;
        value           uniform 0;
}

What would be the reason for the second line:

        U               Urel;

This is not used in 0/k, and 0/omega, while present in epsilon (kOmega model is used, but that seems to be irrelevant here):

innerWall
    {
        type            epsilonWallFunction;
        U               Urel;
        value           uniform 14.855;
}

which is quite strange to me, since one would expect to find this in 0/omega as well, which is not the case.

The issue is that leaving it out in 0/nut does influence the results to some extend. But then the question is how should I know which variables require this description and why?

Thanks,
Ali

[damon707]

Hello Ali,

Did you manage to find any answers regarding this?? I am also trying to do a simulation with a wind turbine rotor with SRFSimplefoam and I noticed that something strange is happening with the turbulence quantities definition. Did you find any source describing how the turbulence quantities should be defined in an SRF simulation??

Best,
George