chenjiaqi

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1. error regarding automatically set formulation to regions

Hello, Following recent practice we have been able to model metal parts using the thin conducting sheet regions and couple with circuit components. However, the last step in the physics check always gives us an error message: cannot determine formulation, as shown in the attached picture. The error message provide no further clues to us how to fix it, and we believe there must be something beyond that we don’t know. Please have a look into the latest model we made, which is much better than our previous work. It is very representative to what we are going to achieve. Most importantly we believe if you may help us solve this error we can expand the example to larger scale models. Regards, BusCell_P.FLU.7z
2. Magnetic / electric loop cut for thin sheet metal

Hello, I found in the user guide of Flux about the 3D connectivity problem of thin sheet metal region, which says: Specificity in 3D: problem of connectivity. (For thin conducting regions) In the presence of holes, the user must create the necessary electric cuts and assign to them to appropriate lines. Attention: magnetic /electric cuts should not touch the thin regions. I wonder how could I create a 3D sheet and a cut on it without touching the region. Could you please explain this a bit? Regards, ken
3. can I use thin metal sheet to connect to wire conductor or non-meshed coils?

Hello, If I attach a solid conductor on a thin sheet metal, would the current on the solid conductor flow onto the thin sheet underneath? I wonder if the conductive connectivity is built in 3D or shall I need to assign terminal connections for the solid and thin sheet via the circuit? Attached are two applications I made: In my application, it would be desirable to model the wide bus plate using thin sheet metal and keep the solid metal pad, which is used to connect current sources. So I created two Flux 3D projects as attached. The first one has two solid metal electrodes on either sides of the thin sheet bus plate; the second project has both solid electrodes on the same side of the thin sheet. The current source is modelled using non-mehsed composite open end coil. The Geometry, Meshing and Physics checks are all right. However, the solver stops without a clear reason after I start to solve it using the reference value (frequency 5000Hz in AC magnetic application). Please let me know what is wrong. Regards, ken thinsheet_solid_bus.FLU.7Z thinsheet_solid_bus2.FLU.7Z
4. thin sheet; cable; wire; coil can I use thin metal sheet to connect to wire conductor or non-meshed coils?

Hi comrades, I am simulating AC magnetic inside a cabinet which I wish to use thin metal sheet to model it. In this scenario, the cabinet is connected to PE wire, which can be modelled by either a solid metal conductor or a non-meshed, composite and open ended coil. The physics check gives me various errors such as "unable to determine the formulation", etc. In a word, if I replace the thin sheet model with a solid metal for the cabinet, the problem vanishes. However, I d like to know how to use the thin sheet metal in Flux 3D. Is it allowed to connect thin sheet metal to a coil conductor and couple it with circuit components? Regards, ken
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