At present I am implementing the standard universal Log law into a research CFD code. The question is " is the slip velocity imposed purely as a tangential component to the boundary or is there still a normal velocity component?" Cheers Stephen

can u explain what u mean to say

I'll try to explain my question again:

Taking a flat plate as an example with x being in the streamwise direction and y is normal to the plate. Is the Slip Velocity i.e. u+ imposed on the element adjacent to the boundary, purely in the x direction or does it have y compentant as well?

The turbulence model being used is KE model. And Wall function is the Standard unverisal log law.

My knowledge tells me that it should only be implied in the x direction, but Iam just seeking reasurance. If this still doesn't make sence I will try again.

Cheers

Stephen