[PeterShi]

Dear Fluent users,

As far as I know, there are two ways to trip a BL in Fluent:

(1) If RANS or DES is used, you can split the entire domain into two sub-domains, one is laminar, the other is turbulent. For the laminar domain, you can check "laminar zone" under the Cell Zone Conditions ta.
(2) You can implement geometry perturbations at the location where a boundary layer is tripped. However, it is the last resolution to me because I really do not want to change the geometry.

A problem comes when I use LES: the laminar zone option is disabled when LES is used. I wonder is there a better way to trip boundary layers in this situation except for the second approach? FYI, I can numerically trip boundary layers easily in OpenFOAM. Not sure if it is feasible in Fluent though.

Best regards,
Peter