which turbulence model is fit for low speed axial compressor？

sukiska · July 19, 2011, 11:24

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!

ArslanOZCAN · July 20, 2011, 09:58

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.

July 19, 2011, 11:24	which turbulence model is fit for low speed axial compressor？	#1
sukiska New Member ski Join Date: Jul 2011 Posts: 3 Rep Power: 14	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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July 20, 2011, 09:58		#2
ArslanOZCAN Member Arslan Join Date: Jan 2011 Posts: 37 Rep Power: 15	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.