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Steady State Natural Convection problem with PISO

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Old   August 7, 2002, 01:00
Default Steady State Natural Convection problem with PISO
  #1
jerry
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hi , all I tried Steady State Natural Convection problem with PISO algorithms. But this warning occurs.. Who do know this warning, solution?

*** WARNING #043 *** MINIMUM RESIDUAL AT THE END, RETURNING NON-CONVERGED SOLUTION

RESU = 5.79205E-03 RESV = 4.46443E-03 RESW = 4.42205E-03 RESP = 5.27473E-01

REST = 1.21827E-04

*** WARNING #013 *** MAXIMUM SPECIFIED CORRECTOR STAGES 20 REACHED BEFORE CONVERGENCE CRITERION IS SATISFIED.

<<<<CONTINUITY EQUATION NOT CONVERGED>>>>

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Old   August 7, 2002, 08:34
Default Re: Steady State Natural Convection problem with P
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john YL
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This may indicate that you have reached the steady state solution and PISO can not reduce the residuals any further?
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Old   August 7, 2002, 20:30
Default Re: Steady State Natural Convection problem with P
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jerry
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Thanks Mr.john YL for your reply.... I want to know whether the warning affects my solution, and know the way to remove the warning.

Please post response.

Thank you!!!!!!!
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Old   August 12, 2002, 06:47
Default Re: Steady State Natural Convection problem with P
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marco
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Hallo Jerry!

I think your solution is NOT converged. You can try increasing the maximum number of PISO corrector stages to a higher number. And you should link star in double precision (that's always advisable with natural convection problems).

If you can't get a converged solution this way, then you should try a transient aproach, as most natural convection problems are not stationary.

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