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Setting a OpenFoam turbulence case without wall functions |
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September 9, 2020, 10:36 |
Setting a OpenFoam turbulence case without wall functions
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#1 |
New Member
Lucie Recurt
Join Date: Jun 2020
Posts: 17
Rep Power: 6 |
Hello everyone!
I have, for my internship, simulate a turbulent flow in a pipe with a part that make the flow rotating. And I have to test different turbulence models to know which one is the closer to experimental results. I have read on Internet and thesis that wall functions are not really appropriate for rotating flows that why I don't want to use wall functions. But I don't understand what to put as boundary condition for the turbulence fields... Does someone have some clues on how to do that? Thank you in advance |
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September 9, 2020, 23:07 |
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#2 |
Member
Ardalan
Join Date: Jul 2012
Location: Atlanta, USA
Posts: 77
Rep Power: 14 |
Your question is too wide.
Which turbulence model do you want to conduct? Generally omega, k, epsilon ~ zero, but not zero. LaunderSharma and other low Re models are fine with this setup. LRR and SSG need another setup. |
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September 10, 2020, 04:49 |
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#3 | |||
New Member
Lucie Recurt
Join Date: Jun 2020
Posts: 17
Rep Power: 6 |
Thank you for your answer.
First I tried with LienCubicKE and the solver simpleFoam. My case is running but the residuals still very high (> 1e-3).Here are my epsilon, k and nut file. epsilon: Quote:
k: Quote:
nut: Quote:
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September 10, 2020, 09:21 |
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#4 |
Member
Ardalan
Join Date: Jul 2012
Location: Atlanta, USA
Posts: 77
Rep Power: 14 |
If that is running with the model that you mentioned, cheers.
The BCs are practically correct. You should keep your yPlus below zero in all time and space. |
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December 30, 2020, 16:21 |
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#5 |
New Member
Josef Dobeš
Join Date: Mar 2012
Location: Czech republic
Posts: 12
Rep Power: 14 |
Hi lucie.recurt,
can I have question regarding your values for k, epsilon and nut - how did you calculate them? Especially you have different values for internalField and for boundaries. Thanks |
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Tags |
boundary, field, openfoam, turbulence, wall functions |
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