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simulation of centrifugal impeller

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Old   February 20, 2007, 03:02
Default simulation of centrifugal impeller
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I'm simulating a centrifugal impeller. I put:
*Inlet = mass flow inelet
*Outlet= outlet pressure
*air with constant density
After 150 iterations the simulation starts to become instable.
How can I improve convergence??
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Old   February 23, 2007, 01:08
Default Re: simulation of centrifugal impeller
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Hi! I think you must reduce under relaxation factor of Turb. kinetic energy and Turb. dissipation energy to 0.6 and use second order upwind method for momentum,Turb. kinetic energy and Turb. dissipation's better to use velocity-inlet B.C. instead of mass flow inlet B.C.

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