problem with directed mesh using one sided geometric volume distribution
 

hello, my friends.
I meet a problem in directed mesh.
I want to meshing a half cylinder with one sided geometric volume distribution.
but the result is bad.
the mesh on the meridian plane is distorted.
it's nomal when I change to one sided hyperbolic volume mesh.
but I want using one sided geometric volume distribution.
so I need some help. thank you in advance.