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Old   December 14, 2003, 00:08
Default outlet pressure
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grad-student
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Can somebody point me to a reference where computational implementation of specified pressure condition at outlet is described..or a code on net where it is programmed..or brief steps...

...do I still specify dv/d(streamwise) =0 to v-equattion solver like in normal outflow condition (zero u v gradient)..
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Old   December 14, 2003, 23:02
Default Re: outlet pressure
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Keith
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As far as I know, if you are working on incompressible fluid, the necessary pressure term is your hydrostatic pressure at the outlet boundary. Correct me if I am wrong, I personally think that the pressure doesn't mater. It is the pressure gradient that drives the flow(go back to fundamental N-S equation). Hope that helps.

keith.
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Old   December 15, 2003, 05:47
Default Re: outlet pressure
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barbaro
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Try this book:

Versteeg and Malalasekera, An Introduction to Computational Fluid Dynamics, pag. 203

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Old   December 18, 2003, 00:19
Default Re: outlet pressure
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grad
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thanks:

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Old   December 20, 2003, 08:09
Default Re: outlet pressure
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kenn
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once you use partial u and v partial streamline-wise = 0, you should not specified pressure anymore. if you want to use pressure Open boundary conditions, you may have to drop velocity OBC.

because, otherwise OBC you provide may conflict each other, and the discrete system may become highly ill-posed.
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