simulation of centrifugal impeller

February 20, 2007, 04:02

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??
Txema

February 23, 2007, 02:08

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 energy...it's better to use velocity-inlet B.C. instead of mass flow inlet B.C.

February 20, 2007, 04:02	simulation of centrifugal impeller	#1
Txema Guest Posts: n/a	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?? Txema

February 23, 2007, 02:08	Re: simulation of centrifugal impeller	#2
Hossein Guest Posts: n/a	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 energy...it's better to use velocity-inlet B.C. instead of mass flow inlet B.C.

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