[IRP]

Dear all, I am dealing with a problem in Star-CD, about the impact of droplet on a surface.
Scalar (1) =Air
Scalar (2) =Water

Indeed, I am going to provide dynamic contact angle (direct: Thermophysical model and properties—Multifluid—Surface tension— User) and phase source as a user coding (direct: Thermophysical model and properties—Source Terms—Scalar— User coding). Before doing these two step I also defined the fluid initialization (user coding) and Momentum source (user coding).

For dynamic contact angle: defining these two equations is necessary
Contact line velocity = -1* (vector (velocity) *grad (volume fraction water))
Capillary number = (Contact line velocity*Dynamic viscosity) / surface tension force

And for Source Scalar:
1- Knowing the value of VOFwater (scalar (2)) at each time step (so, should be exported the data at first)

2- Then, comparing of these (VOFwater) at two time step


I would be appreciated if anyone could help me to that what kind of function as user coding (as like, defining the vector, Gradient, export, import, working example …) would be suitable in this condition.

Thank you very much in advance.