# velocity inlet vs pressure inlet

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 December 4, 2001, 21:01 velocity inlet vs pressure inlet #1 cheong Guest   Posts: n/a 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.

 December 4, 2001, 21:26 Re: velocity inlet vs pressure inlet #2 Jim Clancy Guest   Posts: n/a VELOCITY INLET IS USUALLY USED WITH INCOMPRESSIBLE FLOW...JUST USE IT NO HARM

 December 5, 2001, 18:12 Re: velocity inlet vs pressure inlet #3 cheong Guest   Posts: n/a can i set these two parameter in fluent(velocity and pressure) amd where should i set these input?

 December 6, 2001, 13:57 Re: velocity inlet vs pressure inlet #4 jim clancy Guest   Posts: n/a Sure, from the main menu select DEFINE>BOUNDARY CONDITION..here you can define your boundary conditions..

 December 8, 2001, 09:56 Re: velocity inlet vs pressure inlet #5 cheong Guest   Posts: n/a can i use velocity inlet and pressure inlet at the same time at the boundary condition? if not, which parameter should i use?

 December 9, 2001, 21:04 Re: velocity inlet vs pressure inlet #6 chiseung Guest   Posts: n/a 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.

 April 9, 2011, 03:07 plz #7 New Member   Shainath Join Date: Apr 2011 Posts: 18 Rep Power: 15 can anybody tell me if velocity inlet conditions are given in incompressible flow what should be the pressure in inlet for SIMPLE algorithm