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Comparison of results calculated by OpenFOAM's turbulent model kwSST in weir flow

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Old   March 22, 2023, 05:13
Default Comparison of results calculated by OpenFOAM's turbulent model kwSST in weir flow
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YJ-Kwon
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Hello guys.

I am not good at English, so there may be some awkward parts in the question. I would appreciate it if you could understand this.

I calculated with OpenFOAM following the same weir case as the paper, but I don't know if this result is correct. The turbulence model used k-w SST.
The flow away from the weir end is different from the picture in the paper.
I think it's normal if the same flow as the attached second picture continues to come out continuously. However, the calculated flow converges after a certain period of time, just like the picture I calculated in the first picture.
The attached second picture is described as a capture of the instantaneous flow in the paper.
I want to know if the weir case I calculated is well calculated, is there a post to refer to, or I'm wondering if you guys have any opinions.

Thank you for reading my post.
Attached Images
File Type: png kwSST.png (59.3 KB, 14 views)
File Type: png kwSST Thesis.png (18.4 KB, 12 views)
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Old   March 22, 2023, 12:31
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Santiago Lopez Castano
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You are experiencing a problem that also happens on physical experiments: lack of areation behind the jet. Make sure to leave a pressure inlet in the jump region in order to allow air to enter.
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Old   March 23, 2023, 00:36
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For me, it looks like you used a sReynolds number much lower than in the reference work. Could you give the numbers, please?
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Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)
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Old   March 23, 2023, 00:56
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Quote:
Originally Posted by Santiago View Post
You are experiencing a problem that also happens on physical experiments: lack of areation behind the jet. Make sure to leave a pressure inlet in the jump region in order to allow air to enter.
Thank you for your answer. I'll try as you comment
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Old   March 23, 2023, 01:00
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Quote:
Originally Posted by piu58 View Post
For me, it looks like you used a sReynolds number much lower than in the reference work. Could you give the numbers, please?
Thank you for your answer.
The Reynolds number is 4845.27.
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Old   March 23, 2023, 01:32
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which version of the package did you use? Is that OF6?
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Old   March 23, 2023, 01:39
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which version of the package did you use? Is that OF6?
No, to be exact, v2206 on www.openfoam.com
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