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Skin friction coefficient over surface

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Old   August 9, 2014, 08:24
Default Skin friction coefficient over surface
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Michael Kruger
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Is there a way to obtain the skin friction coefficient over a surface, or am I going to have to calculate it manually?

Thanks in advance
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Old   August 11, 2014, 03:35
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Tom Fahner
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If you use the wallShearStress utility you have the wall shear stress (tauw). You can than use ParaView to calculate the skin friction coefficient (2*tauw/(rho*V^2))

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Old   August 11, 2014, 03:59
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Michael Kruger
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Thanks Tom.

I have only used openFOAM for a few days now and cannot find any documentation on the actual implementation of the Standard Utilities.

Can you perhaps explain its use to me?

In what file and how do I implement the wallShearStress utility?

Also, how do I do such types of calculations in paraView?

Thanks in advance.
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Old   August 11, 2014, 04:08
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Tom Fahner
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Hi, just type "wallShearStress" in the terminal and it will calculate this after your normal run. It is a standard postProcessing OpenFOAM utility. In ParaView you can load the wall patches (not the internalField) and use the calculator filter on it.

I bet you can find a lot of information on both of these by searching the forum.
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Old   August 11, 2014, 04:18
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Michael Kruger
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Thank you very much Tom.

I did indeed try and search for something, but didn't find anything.

I think in the beginning there are a few things that are so basic that no one really talks about it, such as this.

Thanks again, cheers.
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