I have faecd a fact that from manual thet when u are going to capture near wall region you have to refine mesh at near wall region ,and your y plus should be in limit of 11.In your boundary layer there should be 10 nodes.but how to determine this hight.i.e. there should be these much nodes in this hight so that we can mesh according to that. Thaks in advance.

Hi, oh ya this is a (Scheiss) problem, any way here is an idea which might work, try to perform this { ||V-over(arrow)||/||V-over(arrow)_sub(inf)|| =< approx.(0.95) }; that is you compute the local velocity vector and divide by the velocity vector far away and compare the result with some user defined value (~0.95); if it is less then refine the grid and vice versa(coarsen the grid). Please let me know if it works! Hope helped cheers.