rng les
 

does anybody know how to enable rng les model, it is absent in viscous panel (fluent version 6.2) on my unix machine, it shows the rng model in viscous panel in windows machine though (fluent version 6.2),

my superior asked fluent support asia pacific about this, but their reply was that, since rng les is not a good model it is not in viscous panel. (by this logic i assume DES was not good model till 6.1 version of fluent)