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Discrepancy in the Surface Integral of Normal Current Density and Terminal Current
Posted Jul 23, 2021, 4:30 p.m. EDT Low-Frequency Electromagnetics, General, Mesh Version 5.6 1 Reply
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Could anyone help in resolving this discrepancy in the Surface Integral of Normal Current Density and assigned Terminal Current. See attached the geometry under consideration. The study under consideration is joule heating of copper bars.
Terminal boundary with current of 5A is assigned to (1) and ground boundry is assigned to (4). There is a big difference in between 5A and surface integral of the Normal Current Densities (ec. nj) which are calculated at (1) and (4). Any reasons for this discrepancy.
Secondly, I have then assigned floating potential boundary with V= 0 to (3) and (4), and ground is assigned to (2). Even in this scenario I notice the surface integral of current densities of (1) and (2) to be different from that of 5A. Here floating potential is used becuase there (3) and (4) are electrically isolated from each other and floating potential act as a virtual connection.
I will appreciate your help to resolve this issue.
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Hello,
I cannot tell for sure that this is relevant to your situation, but consider having a look at the "Accurate flux computation" entry of the COMSOL manual.