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-   -   velocity inlet vs pressure inlet (http://www.cfd-online.com/Forums/fluent/29137-velocity-inlet-vs-pressure-inlet.html)

cheong December 4, 2001 22:01

velocity inlet vs pressure inlet
 
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.

Jim Clancy December 4, 2001 22:26

Re: velocity inlet vs pressure inlet
 
VELOCITY INLET IS USUALLY USED WITH INCOMPRESSIBLE FLOW...JUST USE IT NO HARM

cheong December 5, 2001 19:12

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

jim clancy December 6, 2001 14:57

Re: velocity inlet vs pressure inlet
 
Sure, from the main menu select DEFINE>BOUNDARY CONDITION..here you can define your boundary conditions..

cheong December 8, 2001 10:56

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

chiseung December 9, 2001 22:04

Re: velocity inlet vs pressure inlet
 
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 April 9, 2011 03:07

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


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