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Accuracy of LRR and SSG in turbulent channel flow |
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August 16, 2016, 14:25 |
Accuracy of LRR and SSG in turbulent channel flow
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#1 |
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Darko Radenkovic
Join Date: Oct 2015
Posts: 38
Rep Power: 10 |
Hello.
I am simulating steady, incompressible flow in channel. Dimensions of channel are: length 6 m, width 350 mm, and height 35 mm. I did simulations with two RSMs - LRR and SSG. When I compare results of simulations with experimental and DNS data, I see that accuracy of simulations can be improved. Measuring section is at 5.8 m from the inlet. Figures are on the following links (from some reason, I couldn't attach pictures on this page) LRR comparison Here is comparison for SSG simulation: SSG comparison I don't have exact DNS data for this case, but I used data for channel flow where Re number is around 40 000 so I believe it can be used for verification, when data are nondimensionalised. Information about setup are here: CheckMesh fvSchemes fvSolution Any suggestion to improve accuracy of these simulations? Best regards, Darko |
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August 23, 2016, 13:03 |
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#2 |
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Darko Radenkovic
Join Date: Oct 2015
Posts: 38
Rep Power: 10 |
Here are velocity profiles that I have as a result of a several simulations.
https://www.dropbox.com/s/eyd4tk3rid...Phase.eps?dl=0 I have error around 5% in velocity profile. What can I do to reduce it? I did simulations on various meshes, but the result is the same. I have trouble to verify RMS values (from above post). Maybe that difference in RMS values (which is causing me troubles) is due to difference in velocity profiles. That is why I need to correct velocity profile. Here is complete case of steady, incompressible, turbulent channel flow, k - epsilon model. https://www.dropbox.com/s/z1w7bu9mv1...imple.zip?dl=0 Any suggestion is appreciated. Best regards, Darko |
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