Low-Reynolds-k-epsilon model

Chris

Hi

I'm doing a project on wall bounded flow using Fluent 5. I would just like to know one thing, Does the standard k-epsilon model with the full low-Re-model as the near wall treatment work well for Low Reynolds number? B'se i have tried everything possible but i'm not getting good results with the Low-Re-ke model. Infact fluent has also suggested using using the RNG models for low Reynolds number and i'm getting better reults with that. Can u explain why, if u can. I'm particularly comparing these models by plotting the y+ vs U+ values comparing with exepriment and what the standard Low Re-ke model by Lanuder and Sharma is giving me, is a good profile in the viscous sublayer region and when it gets in the buffer and fully turbulent region, U+ values reduces and y+ increases. So i'm thinking the problem might be with U_tau, therefore going to the wall shear stress.

Can u help me figure out what i might be doing wrong?

Thanks