packed bed geometry

ABHISHEK DUTTA

dear all, iam a new user and am presently trying to develop a structured grid for 2 geometries : 1. 1 sphere exactly on the top of the middle of 2 spheres. 2. 1 sphere exactly on the top of the middle of 3 spheres. the 3 spheres at the base forms a triangle. (all the spheres are of 3 mm dia and the gap between the spheres is 0.01 mm.) i even did the geometry in a very complex way and i formed several volumes in it also, but they are not splitting from the main volume. this is making me very confused.please help me..if anybody is intersted furthere, mail me your respose , i can send the geometry created by me ,by attched doc in mail. we are actually planning to go for structured mesh as much as possible , instead of the easy unstructured way. thanks..... abhishek