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UDF for dynamic Contact Angle

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Old   May 26, 2020, 15:20
Default UDF for dynamic Contact Angle
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Wolfgang Black
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Hello,

I'm new to Flow-3D but have some fortran experience. It's my understanding that while FLOW-3D allows for single contact angles, it does not have the ability to do a dynamic contact angle to use both the receding and advancing contact angles. I was wondering if anyone here has developed a UDF for this for use with FLOW-3D or if anyone can give me some pointers.

I'm mostly thinking of setting a receding angle and an advancing angle and using the surface gradient to determine which to use...

Something like

if Yf(t-1) < Yf(t):
theta = Theta_adv
elseif Yf(t-1) > Yf(t):
theta = Theta_rec

Where Yf is the species mass fraction of the fluid at the fluid/surface interface...
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bubble dynamics, contact angle, surface tension, udf

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