convergence problem k-kt-omega model
 

Hi everyone,

I'm trying to model gas flow through a pipe filled with solid pellets using the k-kt-omega turbulence model (2D for now, when the solution works I#M switching to 3D). But I can not reach convergence. All the residuals reach the convergence criterion except turbulent (kt) and laminar (kl) kinetic energy. I already tried decreasing the under-relaxation factors, which did not help. Does anybode have any magic tricks or something that lead to a solution?
Any help would be very welcome =)