Hi Mantovani and Karthik,
I was out of the office for the past couple of weeks. It is an impressive study of the boundary layer profiles at different x/D stations. It would be interesting to know what the y+ value of the first cell was at the ~x/D = 50,60,70 stations.
One additional thought about the convergence problems. If a new mesh is being used that was not used before, it might be a good idea to see if the case converges when regular uniform values are used at the inlet. That would help to determine whether the problem is caused by the profiles or by something else.