[syoon]

I’m simulating a backward facing step using LES (oodles).
In order to generate inlet turbulence, I’m using directMappedPatch.
Studying oodles/pitzDailyDirectMapped was helpful to understand the structure.

My case is slightly different from pitzDailyDirectMapped in the sense that the upperWall is not a wall but a symmetryPlane. (I’m simulating a half of a double-sided expansion).
So I need to use either “symmetryPlane” or “slip” condition on the upperWall rather than “wall” condition.

My question is

• Does the use of “symmetryPlane” or “slip” conditions on the upperWall can damage the use of directMappedPatch?
• Between “symmetryPlane” and “slip” condition, what is more suitable to simulate a half of a double-sided expansion? In fact, I don’t understand clearly the difference between “symmetryPlane” and “slip”.

Many thanks,
Sungho