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

Akun · March 22, 2023, 05:13

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.

Santiago · March 22, 2023, 12:31

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.

piu58 · March 23, 2023, 00:36

For me, it looks like you used a sReynolds number much lower than in the reference work. Could you give the numbers, please?

Akun · March 23, 2023, 00:56

Quote:

Originally Posted by Santiago

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

Akun · March 23, 2023, 01:00

Quote:

Originally Posted by piu58

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.

kerim · March 23, 2023, 01:32

which version of the package did you use? Is that OF6?

Akun · March 23, 2023, 01:39

Quote:

Originally Posted by kerim

which version of the package did you use? Is that OF6?

No, to be exact, v2206 on www.openfoam.com

March 22, 2023, 12:31		#2
Santiago Senior Member Santiago Lopez Castano Join Date: Nov 2012 Posts: 354 Rep Power: 15	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. Akun likes this.

March 23, 2023, 00:36		#3
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	For me, it looks like you used a sReynolds number much lower than in the reference work. Could you give the numbers, please? Akun likes this. __________________ Uwe Pilz -- 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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