Theoretical background of formula for dynamic contact angle in interfoam

sebastian_vogl · March 18, 2009, 12:03

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

sandy · April 11, 2009, 07:57

Hi, maybe you can find it in OnnoUbbink 's PhD thesis from the website: http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/

sebastian_vogl · April 14, 2009, 02:47

Hello Sandy,
Thank you very much for your help. I will have a close look at this thesis.

Best regards,
Sebastian

Hectux · June 22, 2009, 12:25

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.

March 18, 2009, 12:03	Theoretical background of formula for dynamic contact angle in interfoam	#1
sebastian_vogl Member Sebastian Vogl Join Date: Mar 2009 Location: Munich, Germany Posts: 62 Rep Power: 17	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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April 11, 2009, 07:57		#2
sandy Senior Member Sandy Lee Join Date: Mar 2009 Posts: 213 Rep Power: 18	Hi, maybe you can find it in OnnoUbbink 's PhD thesis from the website: http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/

April 14, 2009, 02:47		#3
sebastian_vogl Member Sebastian Vogl Join Date: Mar 2009 Location: Munich, Germany Posts: 62 Rep Power: 17	Hello Sandy, Thank you very much for your help. I will have a close look at this thesis. Best regards, Sebastian

June 22, 2009, 12:25		#4
Hectux New Member Join Date: Mar 2009 Posts: 28 Rep Power: 17	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.