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Using Current derived from Voltage

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Hello All,

I have a situation where there is essentially a 2D box in a water tank cross section. I know the boundary voltage of the box. What I'm hoping to do is to add objects into the water to perturb the environment. The issue is that (if I understand correctly) setting the boundary condition of voltage will keep that potential fixed, so you won't get a true perturbation.

The Idea I had to fix this, was to define the box as a current source, using the currents calculated from defining the voltage. First off, how do I set current density (i.e. ec.Jx) with components (x and y), I can only see how to input scalars. Secondly, is there a way to just define a second step to the study to use the current, or do I have to export the current and import it as some function of x and y?

Thanks,
Aaron R. Shifman

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