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Continuity. Stop critertion of PISO and SIMPLE in OpenFOAM solvers. |
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September 20, 2010, 16:12 |
Continuity. Stop critertion of PISO and SIMPLE in OpenFOAM solvers.
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#1 |
Senior Member
Claus Meister
Join Date: Aug 2009
Location: Wiesbaden, Germany
Posts: 241
Rep Power: 18 |
Hallo Foamers!
I have a question related to OpenFOAM solvers with SIMPLE or PISO loop. Why was as stop criterion the number of iteration used or implemented,respectively, and not a number of accuracy, e.g. 1e-10 (sum,global,cumulative)? Has this a specific reason? Cheers! |
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September 20, 2010, 17:53 |
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#2 |
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Niklas Nordin
Join Date: Mar 2009
Location: Stockholm, Sweden
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September 21, 2010, 03:15 |
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#3 |
Senior Member
Claus Meister
Join Date: Aug 2009
Location: Wiesbaden, Germany
Posts: 241
Rep Power: 18 |
I did not know that! Honestly, I am a bit surprised. How can I set up such criterion? In guides and documents, I have nothing read about this, anywhere! Where I can find it?
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September 21, 2010, 03:50 |
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#4 |
Super Moderator
Niklas Nordin
Join Date: Mar 2009
Location: Stockholm, Sweden
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if you are using simpleFoam it is already there, so you just have to add it to the SIMPLE dictionary.
Code:
SIMPLE { nNonOrthogonalCorrectors 1; convergence 1.0e-8; } where you will find initConvergenceCheck.H Code:
// initialize values for convergence checks scalar eqnResidual = 1, maxResidual = 0; scalar convergenceCriterion = 0; simple.readIfPresent("convergence", convergenceCriterion); and then the convergenceCheck.H which is the last include of the iteration-loop Code:
// check convergence if (maxResidual < convergenceCriterion) { Info<< "reached convergence criterion: " << convergenceCriterion << endl; runTime.writeAndEnd(); Info<< "latestTime = " << runTime.timeName() << endl; } |
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September 21, 2010, 04:26 |
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#5 |
Senior Member
Claus Meister
Join Date: Aug 2009
Location: Wiesbaden, Germany
Posts: 241
Rep Power: 18 |
Thank you for you posted. I will looking for it!
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