3D Cyclone meshing problem
 

Hello, this is a student researching about 'Cyclone separator'.

I've tried various way for sophisticated cyclone meshing to increase mesh quality, so I separated cyclone to 4 parts, and meshing them.

But I failed for 'Cone' meshing as you can see the picture. I'd tried various way
such as different mesh size, meshing method(multizone, sweep, hexadominant...), but I couldn't find proper resolution.

Is there any tip for meshing??

Please let me know your ideas.