confidence of CFD in turbomachinery

August 3, 2008, 13:46

Hey guy. I want some questions from expert CFD users.

Presently I am working on effects of Lean and Sweep on performance of compressor. I am comparing different combination of LEAN and SWEEP in order to segragate the efects of both. I have following questions:

1. Should I use through flow code, if yes then how to assume the value of blockage? 2. Will these results guide in getting better design? 3. Or should I use 3D code but using Euler formulation. 4. If yes then will I get the real difference in performance prediction in all design at hand? 5. Shoud I use the 3D Navier Stokes with appropriate turbulence model? but the appropriate is difficult to estimate. 6. Will it be economical to use 3D full N-S code at this stage of design? 7. if yes will these prediction guide me selecting the best design. 8. More over what should be mesh size for all methods?

Regards

deep_cfd · September 17, 2016, 22:04

1 throughflow is for fast evaluation for indicators of performance by the design
2 yes they will but i think your work has to do with the analysing different configurations
3 you can 3d simulations throughflow may not be able to show you the whole picture regarding the lean and sweep
4 yes
5 sst is good
6 depends upon how fast your computer
7 not necessarily depends on your skill in deriving conclusion on the flowfield
8 read about y+ mesh size depending upon the reynolds no

August 3, 2008, 13:46	confidence of CFD in turbomachinery	#1
SA Guest Posts: n/a	Hey guy. I want some questions from expert CFD users. Presently I am working on effects of Lean and Sweep on performance of compressor. I am comparing different combination of LEAN and SWEEP in order to segragate the efects of both. I have following questions: 1. Should I use through flow code, if yes then how to assume the value of blockage? 2. Will these results guide in getting better design? 3. Or should I use 3D code but using Euler formulation. 4. If yes then will I get the real difference in performance prediction in all design at hand? 5. Shoud I use the 3D Navier Stokes with appropriate turbulence model? but the appropriate is difficult to estimate. 6. Will it be economical to use 3D full N-S code at this stage of design? 7. if yes will these prediction guide me selecting the best design. 8. More over what should be mesh size for all methods? Regards

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September 17, 2016, 22:04		#2
deep_cfd New Member Join Date: May 2016 Posts: 3 Rep Power: 9	1 throughflow is for fast evaluation for indicators of performance by the design 2 yes they will but i think your work has to do with the analysing different configurations 3 you can 3d simulations throughflow may not be able to show you the whole picture regarding the lean and sweep 4 yes 5 sst is good 6 depends upon how fast your computer 7 not necessarily depends on your skill in deriving conclusion on the flowfield 8 read about y+ mesh size depending upon the reynolds no