cylindrical pipes

Ben

Hi all. I have two questions

1) I need to model flow through two pipes (actually, oil passageways in an engine). These two pipes come together at a very sharp angle. It is not a bend in one continuous pipe, it is basically two intersecting pipes. How do I build this mesh? I tried two pipes drawn in different coordinate systems such that the pipes overlap, but then I don't know how to subtract or delete the overlapping cells. What is the best way to do this?

2) Can you have a flow that is driven purely by pressure? My objective in modeling this system is to find the necessary inlet pressure to avoid aeration-cavitation in the pipe. It would be nice if I could just specify the inlet pressure, but I think the program will need more info than that. Does anyone know a method similar to this I could use?

Thanks