How to mesh my 3D geometries correctly
 

Hello

Regarding to my concentric and eccentric . I have read and downloaded many papers and tutorials about and my knowledge now is better. but have some specific quires:

1- What is the advantage from drawing sub volumes and 4-planes .

2- Periodic and wall ( Outer Wall ) what r the differences.


The main point is how to mesh my 3D geometries as in my drawing I have followed the next:

1- Volume>cylinder> draw two cylinders then subtract them.


now how to set my mesh (64X16X48) to get 49152 cells only , As firstly when I was drawing by sweep faces the no. of cells was 98400 by using same point above ,



http://s1280.photobucket.com/user/om...f717e.jpg.html