[Lilly]

Dear all, I have got a (maybe stupid) comprehensive question, but I wanted to make sure, that I didn't forget anything: I have got a laminar flow of an incompressible fluid inside a cylindrical pipe (constant diameter, rigid wall). Inlet BC is velocity. Am I right: it shouldn't make any difference concerning the velocity of the fluid which outlet boundary condition I choose (e.g. outflow, p=0Pa, p=100Pa, p=10 000 Pa etc.) since the the average velocity of the fluid at the outlet should be the same as at the inlet (the amount of fluid which is entering the pipe at one timestep is also leaving it at the same time step), also independet of the shape and the length of the pipe (straight or curvature)?! And the average velocity in each cross section of the pipe should also be the same as at the inlet? Or is there any really stupid mistake I make? Thanks a million for any comment! Lilly