ICEM 3d meshing problem
 

hi , everyone
i'm working on tip clearance of compressor cascade , i faced a problem with meshing of tip clearance size
i made the 2d cascade meshing of 5 blades
http://i.imgur.com/gagAeI4.jpg
then , extruded this meshing to make 3d mesh , here i faced the problem
http://i.imgur.com/YdzWyPG.jpg
i wanna make the same meshing along the span of blades but at the zone of tip clearance the meshing must be changed and this is the problem in addition to the higher increase of aspect ratio
thanks advanced to everyone