Hi all,

After reading alll the past comments in this forum,I was wondering had anyone found a way to incorporate knudsen slip effcts in their problem.There seems to be two alternatives

1) model the slip as a shear stress in the UDF.This I have tried doing but it converges in the very first step with 0 values.

2) Put wall slip with the knudsen slip and then no -slip in the bounday tab.This is again not working because I get errors when I initialize the problem.

Anyone having suceeded in this please elaborate.I am not asking for the UDF.I have the UDF just the methodology.

Come on guys please help me out.If anyone has found out a way of doing this please report your finding.I would be more than happy to acknowledge your kind support.