{"id":162136,"date":"2021-09-10T13:45:21","date_gmt":"2021-09-10T13:45:21","guid":{"rendered":"\/forum\/forums\/topic\/maxwell-2d-vs-3d-simulation\/"},"modified":"2021-09-17T19:04:28","modified_gmt":"2021-09-17T19:04:28","slug":"maxwell-2d-vs-3d-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/maxwell-2d-vs-3d-simulation\/","title":{"rendered":"Maxwell 2D vs 3D simulation"},"content":{"rendered":"
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I have recently been running an eddy current model in 3D that generally converges, but to try to reduce both error and runtime, I tried to take advantage of the rotational symmetry of my model and use Maxwell 2D in RZ mode. However, rather than the quick, accurate solutions I was expecting, 2D seems to really struggle with convergence. Even after multiple passes, the error is still changing by several orders of magnitude per pass, and eventually I run into an error where "one side of the equation resulted in infinity or NaN".<\/p>\n

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I have attached a screenshot of my geometry. Other than the fact that the top piece is relatively thin (0.152 mm), the geometry is extremely simple, and given that the 3D model, given enough passes\/mesh refinement per pass can handle well, I have no clue why the 2D model is having so much trouble. It's definitely the thickness of the sheet that is the source of the issue; removing the sheet entirely, simulating just the axisymmetric coil results in convergence after seconds. I added the sheet back in with a much greater thickness of 0.5 cm, which still resulted in convergence, but even reducing to 0.25 cm (more than an order of magnitude thicker than I need to be able to model) resulted in convergence issues?<\/p>\n

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Why is the 2D model having such a problem with convergence for this relatively simple model?<\/p>\n

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\nScreen Shot 2021-09-10 at 9.35.57 AM.png
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