Under relaxation with PISO ? -- CFD Online Discussion Forums

October 7, 2009, 13:01	Under relaxation with PISO ?	#1
AirS Member Join Date: Sep 2009 Posts: 45 Rep Power: 16	hi all, I've had a look on the PISO and SIMPLE algorithm and, as far as I understand the SIMPLE algorithm expects under-relaxation factors while PISO doesn't. So here are my questions: Do I have to set under-relaxation factors in SIMPLE each time I use it ? or can I omit them without risking divergence ? Moreover, can I use them with PISO even though it doesn't expect any ? Thank you for lightening my mind!

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