# NUMERICAL INSTABILITY OVER THE SWIRLING VANES

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 February 8, 2005, 14:34 NUMERICAL INSTABILITY OVER THE SWIRLING VANES #1 Dan Guest   Posts: n/a Hi! Has anyone observed the numerical instability over the swirling vanes. What we have is the flow over a set of vanes. We have pressure inlets and one pressure outlet. What we are observing is the mass flow rate through the pressure outlet is oscillating in a sinusoidal fashion. Has anyone come across this kind of situation and has any comments/suggestions. We have tried with lowering the under relaxation factors. Even to a small number like 0.001, the mass flow rate is still sinusoidal.

 February 8, 2005, 16:48 Re: NUMERICAL INSTABILITY OVER THE SWIRLING VANES #2 Jim_Park Guest   Posts: n/a Are you doing a transient or steady state calculation. By that I mean, are you solving dq/dt = RHS or RHS = 0? Asked another way: are you sure that your problem doesn't actually have a periodic (shedding) solution?

 February 9, 2005, 09:12 Re: NUMERICAL INSTABILITY OVER THE SWIRLING VANES #3 Dan Guest   Posts: n/a I am using RHS=0 It is solved in steady state

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