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December 2, 2022, 09:29 |
Skin friction coefficient with simpleFoam
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#1 |
New Member
Kermit
Join Date: Jan 2021
Location: France
Posts: 19
Rep Power: 5 |
Dear all,
I'm working on a 2D backward-facing step at with the simpleFoam solver and I'd like to compute the skin friction coefficient on the wall. To do so, I use the non-dimensionalized wall shear stress (with units) obtained with the postProcessing utilities and then I compute as follows: (1) : instead of using the conventional formulation (2) : where is the dimensional form of the wall shear stress. However, as it can be seen in the attached figures, my results are better when I use the conventional formulation and I dont understand why... Does anyone have an explanation for this? Thanks for your help! With Eq. (1): cf.png With Eq. (2): cf_conventional.png |
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May 19, 2023, 02:34 |
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#2 |
New Member
Join Date: Sep 2019
Posts: 14
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Hi Kermit
Did you find your answer? I almost have the same issue! |
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May 22, 2023, 11:46 |
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#3 |
New Member
Kermit
Join Date: Jan 2021
Location: France
Posts: 19
Rep Power: 5 |
Hello saturn_K,
I assumed that the first formulation was the correct one, since it is dimensionally good. What do you think of it ? Kermit |
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May 22, 2023, 12:34 |
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#4 |
New Member
Kermit
Join Date: Jan 2021
Location: France
Posts: 19
Rep Power: 5 |
I'd also like to point out that the following tutorial supports the first relationship:
https://develop.openfoam.com/Develop...FlatPlate/plot Best regards. |
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Tags |
simplefoam, skin friction coefficient, wall shear stress |
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