Varying A Parameter of a function to get various values from the equation

Hello, I recently started using COMSOL and I am totally on my own and would be really grateful if you could help me out with one question: I'm trying to simulate the change of contact angle of a microdroplet using voltage variation. What I can't seem to be able to get at, is corelating the contact angle (from Wetted wall in laminar two-phase flow model) with the voltage, which varies between zero and one. How do I relate them with an equation that I will specifiy myself (the Young-Lippman equation) such that I can successfully move the droplet?

I mean, how do I vary the voltage between 0 and 1 such that the droplet moves?

And one more question, what do eigenvalues do?

I am very new to this, so answer charitably please!

I appreciate it!