hi, i have a water-air hilly terrain pipe flow. since i have both initial pressure and superficial velocity for both phases value. which type of inlet should i use (pressure or velocity inlet? thanks for any suggestion.

VELOCITY INLET IS USUALLY USED WITH INCOMPRESSIBLE FLOW...JUST USE IT NO HARM

can i set these two parameter in fluent(velocity and pressure) amd where should i set these input?

Sure, from the main menu select DEFINE>BOUNDARY CONDITION..here you can define your boundary conditions..

can i use velocity inlet and pressure inlet at the same time at the boundary condition? if not, which parameter should i use?

As I know, that is impossible. Moreover, you don't have to set both boundary conditions. When you give velocity inlet b.c. to the inlet, both pressure and velocity are calculated by SIMPLE algorithm. Default setting in pressure-velocity coupling method is SIMPLE. But, in this case, absolute value of pressure is meaningless, paraphrase, only pressure drop through your system is meaningful.

P.S. If you are more concerned about pressure value in your geomety, pressure inlet and pressure outlet b.c.s would be better.

[shainath]

can anybody tell me if velocity inlet conditions are given in incompressible flow what should be the pressure in inlet for SIMPLE algorithm