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which turbulence model is fit for low speed axial compressor?

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Old   July 19, 2011, 11:24
Smile which turbulence model is fit for low speed axial compressor?
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ski
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hello,I am trying some k-e models in the numeca for a low speed compressor. the maxium axial velocity is 30 m/s .
I used the SA model in the past and the calculated total characteristic line has a good agreement of the test result, but the parameters distribution at the outlet section does not.
So I decided to use some k-e models yet I find that it will blow up at a bigger flow rate than SA model using k-e models or SST model of numeca. I set the total temper and pressure as inlet condition and static pressure as the outlet condition, CFL=3, the y plus <8. I do not know the reason of blow up at bigger flow rate using k-e model ,or is there some operation should be done ?
Thank you very much for your help!
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Old   July 20, 2011, 09:58
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Hi;

Try to keep y+ value in 1-5 range and try k-epsilon (extended wall function) turbulence model. You should first try it in the design pressure, than you can try the other presures to plot the eprformance map.
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