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how to calculate rms velocity fluctuation after runtime |
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August 11, 2012, 09:44 |
how to calculate rms velocity fluctuation after runtime
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#1 |
New Member
Join Date: Nov 2011
Posts: 11
Rep Power: 14 |
Hello ,
I used les model but I cant calculate rms velocity fluctuations or reynolds stress tensor . Does anyone know how we can calculate rms velocity fluctuations during post-processing? Thanks so much, |
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August 14, 2012, 17:32 |
uprime calculation
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#2 |
New Member
Ali Lohrasbi Nichkoohi
Join Date: Oct 2011
Posts: 15
Rep Power: 14 |
hi nati
after your solution is terminated, just write in terminal window( your runs directory): uprime the velocity fluctuation is calculated and save on your folder runs. see page 93 of openfoam userguide. nichkoohi@yahoo.com |
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August 14, 2012, 20:28 |
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#3 | |
New Member
Join Date: Nov 2011
Posts: 11
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Quote:
hi, tnx! In uprime, it has been hypothesized that rms velocity fluctuations in diffrent directions are same and equal with sqrt (2/3k)! |
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November 9, 2012, 01:40 |
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#4 |
Member
Join Date: Nov 2010
Location: Tokyo / Japan
Posts: 40
Rep Power: 15 |
Hi,
I also dealt with that problem. I wrote a small tool called postAverageTurbulenceFields which iterates over all the timesteps in your directory and writes out the whole set of turbulence properties k, eps, nu_eff, R, R_eff, Umean, UPrime2Mean So far it works for LES turb models but modification to RAS turb models should be easy. You still need that tool? it's basically an extension of the tool postAverageFields by eelcovv http://www.cfd-online.com/Forums/ope...rocessing.html |
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December 9, 2012, 09:13 |
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#5 | |
New Member
Join Date: Nov 2011
Posts: 11
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Dear Hanzo,
Pardon me for being late in answering you. Yes , I still need it so much. can you help me on this issue ? Regards, Nati Quote:
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February 5, 2013, 05:50 |
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#6 |
Senior Member
Albrecht vBoetticher
Join Date: Aug 2010
Location: Zürich, Swizerland
Posts: 237
Rep Power: 16 |
Hi Hanzo, I am interested in your tool, too. I work with the hybrid LES / RANS models of the LEMOS extensions and I have to think well about how to visualize the turbulent fluctuations due to LES and RANS seperateley. I would be happy if I could have a look at your code...
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February 7, 2013, 08:42 |
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#7 | ||
Member
Join Date: Nov 2010
Location: Tokyo / Japan
Posts: 40
Rep Power: 15 |
Quote:
Quote:
http://www.cfd-online.com/Forums/ope...ields-les.html Let me know if it works Best, Hanzo |
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