# asking usage of velocity inlet

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 November 21, 2009, 19:21 asking usage of velocity inlet #1 Senior Member     teguh hady Join Date: Aug 2009 Location: Surabaya, Indonesia Posts: 153 Rep Power: 9 Hi All I read tutorial on http://courses.cit.cornell.edu/fluent/plate/step3.htm. I see something odd. The BC of Inflow is Velocity inlet & The fluid is ideal gas. I think Velocity inlet is used for incompressible flow. Can you explain it?? Thank You, teguh __________________ Now Or Never!!! Last edited by teguhtf; November 21, 2009 at 20:57. Reason: Correcting

 November 22, 2009, 07:32 #2 Senior Member   Herman Join Date: Nov 2009 Posts: 122 Rep Power: 9 Hi, velocity inlet is the B.C. of inflow, as you write. Why do you think that condition as incompressible flow? I think that condition only as a condition that you can impose.

 November 22, 2009, 10:20 #3 Senior Member     teguh hady Join Date: Aug 2009 Location: Surabaya, Indonesia Posts: 153 Rep Power: 9 Hello, Thanks for replying. I have run that simulation. It run completely. But there is warning on FLUENT when I choose velocity inlet as inflow. In FLUENT manuals, compressible flow can be solved by using mass flow inlet or like pressure inlet. I'm afraid if i impose the boundary, there will be incorrect result. I see if compressible flow can be assumed as incompressible flow if the velocity < 0.3 Mach. However there is still error, isn't it?? teguh __________________ Now Or Never!!!

 November 22, 2009, 11:28 #4 Senior Member   Herman Join Date: Nov 2009 Posts: 122 Rep Power: 9 As far as I know, I don't think that the error is due to velocity inlet BC. I try to solve a simple plane plate imposing supersonic velocity inlet, and fluent doesn't report any error (even if the result may be wrong....) . What tipe of error fluent report for your problem?

 November 23, 2009, 07:39 #5 Senior Member     teguh hady Join Date: Aug 2009 Location: Surabaya, Indonesia Posts: 153 Rep Power: 9 Well, There is warning when i choose Velocity Inlet as inlet BC. I think it can cause error on my simulation. Am I wrong?? For case high mach number. There is option pressure far field or pressure inlet (I just read some tutorials on studentFLUENT). Is it OK if we use velocity inlet to simulate compressible flow for high mach number?? Can you tell me your reference?? Thanks for helping teguh __________________ Now Or Never!!! Last edited by teguhtf; November 23, 2009 at 07:41. Reason: correcting

 November 24, 2009, 04:47 #6 Senior Member   Herman Join Date: Nov 2009 Posts: 122 Rep Power: 9 Here there are all fluent guide and manual. Try to visit it. http://hpce.iitm.ac.in/website/Manua...help/index.htm There are also some tutorials.

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