mixing planes
 

Hi,

I'm trying to model flow in a garden pump. I had generated 4 meshes for this purpose, which also have been merged (using fluent merging utility) and connected with some mixing planes. Two of the meshes are rotating relative to the rest. I tried to interate but all I got is convergency after 5/6 iterations (I'm using CFD Fluent). I've also tried to rotate all of the grid and stop the stationary grids at some point of the iteration for initiation purpose but this lead to a reallly reallly slow convergency. Any clue for my problem?

Thanks guys.