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August 27, 2010, 11:07 |
Under-relaxation of PISO
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#1 |
New Member
Gregor
Join Date: Jan 2010
Location: Ljubljana, Slovenia
Posts: 5
Rep Power: 16 |
I'm interested in what actually does UEqn.relax() in pisoFoam ?
It stabilized (accelerated) my comptutation of the thermo flow in a channel and the phase change liquid-solid a lot, but I do not know if the solution is correct, I mean the transient solution, not the steady-state one. Thanks for any help, Gregor |
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September 3, 2013, 03:57 |
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#2 |
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 849
Rep Power: 18 |
UEqn.relax() exists in pisoFoam. but there is no p.relax(), Im confused too. Did you find a solution?
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September 3, 2013, 04:09 |
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#3 |
New Member
Gregor
Join Date: Jan 2010
Location: Ljubljana, Slovenia
Posts: 5
Rep Power: 16 |
Not yet, unfortunately.
With regards. G. |
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June 9, 2017, 05:16 |
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#4 |
New Member
rik houthuys
Join Date: Jan 2017
Posts: 27
Rep Power: 9 |
It's an old thread but I also can't find an answer.
Do any one know why we have Ueqn,relax() in pisoFoam which is a transient solver ? Also when we should use equation relaxation (Ueqn.relax()) and explicit relaxation (p.relax)? Any contribution is highly appreciated |
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June 9, 2017, 05:55 |
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#5 |
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 849
Rep Power: 18 |
No matter SIMPLE, PISO, SIMPLEC or others, you can UEqn.relax(). However, you can not p.relax() for PISO. But p.relax() works for SIMPLE and SIMPLEC.
See Peric page 177.
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