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Need CAVPRO.f example

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Old   December 6, 2004, 10:31
Default Need CAVPRO.f example
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Chris House
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Can someone give me an example of a CAVPRO.f subroutine? I am trying to use the cavitation feature of STAR-CD and need to edit the saturation pressure to be a function rather than a constant.

Chris
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Old   December 15, 2004, 08:34
Default Re: Need CAVPRO.f example
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4xF
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Just for curiosity: Why do you need to have the saturation pressure as a function? As far as I know, the saturation pressure is a function of temperature and is very little dependent on pressure variations. And the cavitation model implemented in STAR (anybody corrects me if I am wrong here) is isothermal.
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Old   December 15, 2004, 15:11
Default Re: Need CAVPRO.f example
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Chris House
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I need the saturation pressure as a function because I am working with air and oil in cavitation.

The air/oil system does not behave like a fluid/vapor system. The lower the pressure gets, the more air comes out of the solution. That's why I need to make the saturation pressure as a function.

Can you please help me out with a CAVPRO.f subroutine or the variable names for the Rayleigh model that I need to use with the FORTRAN code so it returns them to STAR correctly?

Any help you could give me would be appreciated.

Chris
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Old   December 16, 2004, 05:42
Default Re: Need CAVPRO.f example
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4xF
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The CAVPRO subroutine appears to be called on per cell basis (i.e. called for every cell). Thus, you should calculate for every cell PV and send it back to STAR. For example, you can have a variation of PV with the local pressure as:

REAL A,B PARAMETER (A=1.e-5,B=0.01)

PV = A*PR**2 - B*PR + 2370

RETURN END

Hope this helps. If you still do not understand the logic of STAR subroutines programming, I would highly recommend you to attend a training course (2days) on user subroutines. I've learnt a lot doing so.

Take care...
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