Hi Rwoolhou,

Thanks for your comment. So I will try that.  As you can see in the below picture, ununiform mesh in solid 1 and solid 2 are the main reason for splitting the body into small pieces. I am wondering if there is any other way to get a nice hex mesh without splitting the bodies? In addition, how can I get rid of the warning error?!

P.S. I tried face meshing but shows "Error in the requested meshing operations"

Thanks in advance.