Electric potential at t=0

Hi,

I was surprised to find that when my model is plotted at t=0, the electric potential that I apply appears. I was assuming that at t=0, V =0. My initial value for V is zero.

This does not seem correct to me. I find the same thing in the electrochemical_polishing.mph model from the COMSOL Model Library.

I have attached screenshots of both models.

Seems to me that at t=0, V =0, correct? Also, at what value of t does the solver apply the electric potential?

If I can't get around this, I would want to control the application of the electric potential to follow an exponential ramp such as: Vrf= (Vf -V0)* 1-exp(-t/tau) where Vf is the final potential desired, V0 is the initial potential at t=0, t = time, and tau = 1 sec.

Can anyone in the forum help with that?

Thanks,

Art