Convergence Difficulties
dear all
I am doing analysis on centrifugal blower. The analysis is not getting convergence for some changes in boundary conditions like mass flow at outlet.the maximum residual value for this case is 7e04. but required one is 1E04. i have checked converged results at different values of maximum residual value. the result is not much varing in between 8E04 to 1E04. now my question is, can i take the results at residual of 8e04 as final results? if anybody know the answer please give reply. thanks sarath 
Re: Convergence Difficulties
Dear Sarath,
I had similar problems interms of convergence with my case (Axial Compressor). I was recommended, to specify Static Pressure as an outlet condition instead of the outlet massflow rate. This change worked in my case and I was able to effectively minimize convergence issues. Further refinements were made to the geometry and grid which gave me results, I was looking for !!! If my memory has not let me down, it is highly recommened to have an RMS of 1E06 (design condition) for any turbomachinary simmulation in CFX 10.0. Also if you search using the word "convergence" as a keyword within CFX 10.0 manual (mainly in CFX Pre and Solver PDFs), it should lead you to boundary setting and solver setting details for better convergence with accuracy. I hope this piece of information helps you..... Good luck. Best regards, Arjun 
Re: Convergence Difficulties
better to reach RMS at 1e6 for convergence.

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