# how to solve the diverage of high speed centrifugal compressor, CFD code is STAR CCM

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 December 10, 2011, 06:49 how to solve the diverage of high speed centrifugal compressor, CFD code is STAR CCM #1 New Member   layth Join Date: Apr 2011 Posts: 10 Rep Power: 8 Sponsored Links hello Dears, Please could anyone help me to solve my problem with high speed turbulent flow inside centrifugal compressor. I alreadt made simulation the flow inside centrifugal compressor for specifics speeds such as 60000 rpm and 70000 and 80000 rpm ,so there is no problems and the solver converge . but when I changed the speed into 100000 rpm the solver diverage cfd code is Star CCM+ I am will be very happy if you help thanks regards

 January 2, 2012, 19:47 #2 Senior Member   Join Date: Oct 2009 Location: Germany Posts: 637 Rep Power: 14 Is it a stationary or transient simulation? Did you chance any parameter (like time step size or under relaxation factor) when changing the rpm? Are all other boundary conditions set appropriate to the problem with higher rpm?

 May 21, 2012, 05:48 #3 Member   jk Join Date: Jun 2009 Posts: 64 Rep Power: 10 Hi Layth I am running a compressor case in starccm+. For my unsteady analysis while the impeller makes one full rotation, my mass flow at the exit is not remaining constant and it goes on decreasing. Can You pls tell me the reason for this. Infact I have started from a steady converged case only. thanks

 May 21, 2012, 05:48 #4 Member   jk Join Date: Jun 2009 Posts: 64 Rep Power: 10 Hi Layth I am running a compressor case in starccm+. For my unsteady analysis while the impeller makes one full rotation, my mass flow at the exit is not remaining constant and it goes on decreasing. Can You pls tell me the reason for this. Infact I have started from a steady converged case only. thanks

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