Kkanade,Thank you very much for your reply. Is it necessary to associate the outer edges to the sphere surface? These are catched up automatically when I click on projected edge/mesh shape. If so, how can I associate the edges to the sphere if I dont have any curve defining the sphere? The only geometry inherited is the surface item.. Should I manually create curves surrounding the sphere and then associate?.I manually blocked all fluid region dilimited by an injection nozzle contained within a spheric wall, So my fluid region is nothing but a sphere without the volume occupied by the nozzle, this is why I have lots of blocks for my sphere..n