[rvl565]

Hi,

I am a little confused about the omega wall boundary condition.

I am running a turbulent flow over flat plate ( simpleFoam,komegaSST, 10m/s, 1%Tu intensity) and comparing the value of cf with a theoretical correlation.

When i use the Menter's wall boundary condition the cf is underpredicted ( about 70% error i think)

but when i use the omegawall functions value at the wall ( i run the case with the wall function for a few iterations and see what value it uses( which is a constant along the wall) and then use that particular value as 'fixedValue'), i get very good results ( <4% error)

To understand why this was happening, I looked at the omega wall function code and saw the following line:
scalar omegaVis = 6.0*nuw[faceI]/(beta1_*sqr(y[faceI]));

instead of the 60 ( as in menter's paper) there is a 6.0 in the wall function code.

Why is this so? Which one is correct?

Thanks for your help!!