Hello I set a relative size mesh of 0.05%. It gives an error that the mesh size is less than the curvature tlerance limit. What does this mean?? Also how to deal with it. Regards Waseem

is it possible to do hexahedral mesh in starCD? if one can do it, how it is?

I have never worked with STARCD. Sorry....

yes of course, you can create a trimmed mesh, you'll obtain a mesh with hexaedral core and different cells at boundaries (trimmed cells) where the hexa doesn't fit your geometry.
But it's better for you if u use Star-CCM+...it's more simply to set in the meshing process, it's faster than Star-Cd and with CCM+ you can customize the mesh...