PISO Algorithm

March 15, 2005, 08:38

I have two questions about PISO algorithm: 1. Is underrelaxation for the secons Pressure Correction in PISO never necesseray? 2. Have I also to correct the massfluxes with a expression of the second corrections? (I think, mass conservation should already be fullfilled after the first correction?!)

Thank you for your Help!!

March 15, 2005, 08:51

1) Provided you solve for the pressure properly, no (beware of non-orthogonal correctors)

2) Yes, you should correct the mass fluxes after every pressure solution - the fluxes are conservative after the first corrector as well but are no longer consistent with the velocity field (which is kind of important)

Enjoy,

Hrv

March 15, 2005, 08:38	PISO Algorithm	#1
Benedikt Flurl Guest Posts: n/a	I have two questions about PISO algorithm: 1. Is underrelaxation for the secons Pressure Correction in PISO never necesseray? 2. Have I also to correct the massfluxes with a expression of the second corrections? (I think, mass conservation should already be fullfilled after the first correction?!) Thank you for your Help!!

March 15, 2005, 08:51	Re: PISO Algorithm	#2
Hrvoje Jasak Guest Posts: n/a	1) Provided you solve for the pressure properly, no (beware of non-orthogonal correctors) 2) Yes, you should correct the mass fluxes after every pressure solution - the fluxes are conservative after the first corrector as well but are no longer consistent with the velocity field (which is kind of important) Enjoy, Hrv

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