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-   -   Under relaxation factor for unsteady NS scheme? (http://www.cfd-online.com/Forums/main/9950-under-relaxation-factor-unsteady-ns-scheme.html)

zonexo September 26, 2005 21:15

Under relaxation factor for unsteady NS scheme?
 
hi,

I am working on a unsteady fractional step FVM unsteady scheme and at times my solution blows up.

I've read that in SIMPLE scheme, there's something called under-relaxation factor which prevents divergence of variables. I believe the default values in Fluent is 0.3 & 0.7 for p and u,v.

However, can i use it for my unsteady scheme? i've used it in an steady problem and it works. but if it's an unsteady problem, it 'll cause time inaccuracy, right?

Thanks!


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