{"id":361151,"date":"2024-04-08T15:46:02","date_gmt":"2024-04-08T15:46:02","guid":{"rendered":"\/forum\/forums\/topic\/charge-thermo-electric-cosimulation-meshing-issue\/"},"modified":"2024-04-08T17:55:50","modified_gmt":"2024-04-08T17:55:50","slug":"charge-thermo-electric-cosimulation-meshing-issue","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/charge-thermo-electric-cosimulation-meshing-issue\/","title":{"rendered":"CHARGE Thermo-Electric Cosimulation meshing(?) Issue"},"content":{"rendered":"
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Hi! I am trying to simulate a 3d SOI device in CHARGE across DC bias points with the thermo-electric coupled solver and am running into some issues in mesh generation (see below screenshot). Note that meshing completes (or at least the solver considers it complete).<\/div>\n
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Here is the error (embedding links doesn’t seem to work)<\/p>\n<\/div>\n

https:\/\/i.ibb.co\/ZBmzGZM\/Screenshot-2024-04-08-at-8-13-20-AM.jpg<\/div>\n
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Here is the device. This is a 3d simulation, and the cladding material is SiO2.<\/div>\n
https:\/\/i.ibb.co\/vLqnZ51\/Screenshot-2024-04-08-at-8-16-51-AM.jpg<\/div>\n
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It seems that the error is related to the contact (blue, aluminium) silicon (red) junction but I’m not sure how to confirm this.  One contact is constant at 0v and the other is swept from 0v to 4v<\/div>\n
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For reference, the si is around 150nm thick and the contact is ~1um by ~2um.<\/div>\n
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what I’ve tried:<\/div>\n
– decreasing the triangle quality (to ~15% above ‘none’) as well as the max edge length (down to .1um, min edge length at .01um).<\/div>\n
– enabling PLC edge splitting but I’m not quite sure how to go about setting its value<\/div>\n
– moving the contacts down (so they overlap with the silicon) and decreasing the mesh order, this just makes tessellation run for many minutes and then the simulation fails right after tessellation without error.<\/div>\n
– I’ve tried this on Lumerical versions 2024R1 and 2021R2.3<\/div>\n
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It seems like there isn’t an actual error, just these warnings- I’m not sure if there’s a way to increase verbosity or something? How should I go about debugging this? Thanks!<\/div>\n
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note that this error appears this issue only occurs when the temperature dependence type is set to ‘coupled’ (i.e. thermo-eletric), which my simulation must account for. The simulation runs correctly in isothermal mode.<\/div>\n
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edit: looks like the device-engine is segfaulting after the mesh is generated e.g.<\/div>\n
“`<\/update>
<status>MESH_FINISH<\/status>
<update> 
    <devicesolverstatus0>initializing<\/devicesolverstatus0> 
 
<\/update>
<update> 
    <progress>0<\/progress> 
<\/update>
Segmentation fault (core dumped)“`<\/div>\n
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I am able to run ‘coupled’ simulations with simpler devices<\/div>\n","protected":false},"template":"","class_list":["post-361151","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t