[Ruonin]

Hi folks!

I am trying to change a High Re k-ep model from a software that I have into a Low Re k-ep model, particularly the Kasagi model.

So far so good, except I have a couple of doubts that I'm kind of stuck...

1) The software does not let me per se to impose a "no-slip" condition at the walls, so I though of working around it by using a "Slip" condition plus zero velocity at the walls and last imposing a friction velocity at the same walls. Is this coherent?

2) Since it is a Low Reynolds closure model I have a value that I need to impose for epsilon at the walls and the adjacent cells. This is the big issue, since I keep getting an error for this part as I try to solve the simulation.

I define y+ as show here in the wiki , being a function of the friction velocity. http://www.cfd-online.com/Wiki/Dimen...e_%28y_plus%29

The equations for this model are in the following link:
https://cfd.kookmin.ac.kr/pdf/paper2/asme90_1.pdf

I keep getting an error stating that the "epsilon" variable is not define in certain points. Am I coding the model incorrectly?

How do I combine the boundary conditions near the wall for epsilon and the rest of the domain?

Hope someone can help!

Cheers!

Rui Silva