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Theoretical background of formula for dynamic contact angle in interfoam

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Old   March 18, 2009, 13:03
Default Theoretical background of formula for dynamic contact angle in interfoam
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Sebastian Vogl
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Hello everyone,

I have got a question related to the calculation of the dynamic contact angle in the interFOAM solver.

InterFOAM calculates the dynamic contact angle (theta) via the following formula:

theta = theta0 + (thetaA - thetaR) * tanh(uwall/uTheta)

theta0 = static contact angle
thetaA = Limiting advancing contact angle
thetaR = Limiting receeding contact angle
uTheta = dynamic contact angle velocity scale

Could you please tell me where this formula comes from?
Is there any book/paper in which this formula was derived?
How is uTheta determined?

Actually they are three questions and not only one.
I would be very grateful, if you could help me on my problem.

Thank you very much in advance for your time and help!

Sincerely,
Sebastian Vogl
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Old   April 11, 2009, 07:57
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Sandy Lee
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Hi, maybe you can find it in OnnoUbbink 's PhD thesis from the website: http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/
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Old   April 14, 2009, 02:47
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Sebastian Vogl
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Hello Sandy,
Thank you very much for your help. I will have a close look at this thesis.

Best regards,
Sebastian
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Old   June 22, 2009, 12:25
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I have not found any hints. In the PhD.

My problem is: What is Uwall?

In my cases the wall velocity is always 0. Therefore the dynamic contact angle is always the static one.
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