Current density for conductive media DC problem (2d)
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I've solved a multi-domain 2D conductive media DC problem for the potential u. I can plot the electric field E ... it's the gradient of the potential. Now I want to plot the current density, J. This is sigma*E where sigma is the conductivity in a region. But I can't figure out how to access what region a point (x,y) is in. Its clearly possible because the solver can do it, but the solver's methods are private.
How do I find the region that a specified point (x,y) is in? Or, is there a function that will plot J (vector field) directly from the solved model?
Thanks.
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