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Under relaxation factor for unsteady NS scheme?

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Old   September 26, 2005, 21:15
Default Under relaxation factor for unsteady NS scheme?
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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?

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