I saw an old thread saying it was not possible to use roughness model for kw-sst. Is this status the same now?

You can use it but but only by editing the ccl yourself (latest I saw).

Is there a sample on this editing?

To use wall roughness in combination with omega based turbulence models; Use either (in the wall boundary conditions section of the ccl) :

WALL ROUGHNESS:

Option = Rough Wall

Roughness Height = x [m]

END # WALL ROUGHNESS

TURBULENT WALL FUNCTIONS :

Option = Automatic

END

or:

WALL ROUGHNESS:

Option = Rough Wall

Roughness Height = x [m]

END # WALL ROUGHNESS

TURBULENT WALL FUNCTIONS :

Option = Scalable

Minimum Yplus = y

END

You have to fill in x and y of course.

Thanks! I was earlier worried that this might work only for k-w or k-w BSL only but not kw-SST. Glad to presume it works for kw-SST as well! Bye.