# RE: Pressure wave

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 August 17, 2004, 16:20 RE: Pressure wave #1 tah Guest   Posts: n/a Sponsored Links I am using Phoenics to simulate a pulsatile air flow in a pipe. The velocity at entrance follows a sinusoidale shape. I want to know if it is possible to see the pressure wave propagation inside the pipe when I use an incompressible flow, and how to deal with if not. thanks for any advice.

 September 8, 2004, 21:52 Re: RE: Pressure wave #2 Carlos Guest   Posts: n/a In incompressible flows, pressure waves travel instantaneously. You can see the waves during the convergence process, but it is a numerical result without physical meaning. Hope this helps,

 September 15, 2004, 21:08 Re: RE: Pressure wave #3 tah Guest   Posts: n/a hey carlos Do you mean that I must use compressible flow. In our case, the flow is turbulent, but we have no idea about mach number. thank you for your contribution. tah

 September 18, 2004, 18:34 Re: RE: Pressure wave #4 Carlos Guest   Posts: n/a No, what I mean is that you cannot use a constant density. You have to develop an expression for your density that should be a function of pressure. PHOENICS has many options of density expressions, but I do not know if any of them can be what you need. If I were you, I would try to use a density that is calculated from the ideal gas equation as a first approximation (it is one of PHOENICS options) just to try to see the waves. Then, having success, I would try something more specific. Watch out if your flow is supersonic. You should take special care in this case. Hope this helps you.

 September 27, 2004, 16:34 Re: RE: Pressure wave #5 tah Guest   Posts: n/a Hi carlos thank you for explanation. but As Iam a beginner in CFD modeling, is there any diffrence between your suggestion ( variable density) and compressible flow. best regards, tah

 January 25, 2005, 03:39 Re: RE: Pressure wave #6 uzaki Guest   Posts: n/a U should study thoroly the flows then u can do the modelling

 March 25, 2005, 14:43 Pressure wave #7 mitesh farsodia Guest   Posts: n/a i want to know that how this pressure wave(sound wave)can be conserved and how it can be converted in to electric current(energy).

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