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effect of reference pressure on convergence

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Old   January 23, 2009, 07:45
Default effect of reference pressure on convergence
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sachin
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hello

Is there any effect of the reference pressure(to be given while giving boundary conditions in CFX)on convergence ?
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Old   January 26, 2009, 18:03
Default Re: effect of reference pressure on convergence
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Glenn Horrocks
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Hi,

Yes, sometimes. A well-chosen reference pressure reduces numerical round-off errors which will lead to improved convergence. For many simulation this is not an important factor, but for a small number of simulations it is important.

An example where it would be important is a flow with a high pressure expanding into a low pressure region. If the reference pressure is set to the low pressure then it should work OK. If set to the high pressure you will get increased round-off errors and possibly less numerical stability.

Glenn Horrocks
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Old   January 27, 2009, 12:23
Default Re: effect of reference pressure on convergence
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sachin
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got it. Thank you very much Glenn.
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