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Old   August 17, 2004, 16:20
Default RE: Pressure wave
  #1
tah
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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.
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Old   September 8, 2004, 21:52
Default Re: RE: Pressure wave
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Carlos
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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,
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Old   September 15, 2004, 21:08
Default Re: RE: Pressure wave
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tah
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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
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Old   September 18, 2004, 18:34
Default Re: RE: Pressure wave
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Carlos
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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.
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Old   September 27, 2004, 16:34
Default Re: RE: Pressure wave
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tah
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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

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Old   January 25, 2005, 03:39
Default Re: RE: Pressure wave
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uzaki
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U should study thoroly the flows then u can do the modelling
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Old   March 25, 2005, 14:43
Default Pressure wave
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mitesh farsodia
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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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