need help for mesh
 

Hello, guys

I am a graduate student working on the ANSYS CFD project for my master thesis, now i have several problems about my project, hope some experienced
engineer could help me, so I can graduate

1, this is my structure with highly curved face and small gap inside

any one can give me some instructions about making a better mesh ,
ansys workbench does not help now, i tried millions time, still cannot get a decent mesh

2 follow a senior engineer's instruction, and I sliced the geometry, mesh s still not decent
see attached

In geometry, Change the size in sizing option.
By decreasing the size, you can get better mesh.

thx, sizing is the first things into my consideration , well, thx