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Diagnosis of E-field artifacts at periodic boundarires
Posted Jun 7, 2022, 7:35 a.m. EDT RF & Microwave Engineering, Materials Version 5.6 1 Reply
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Hello people, another question.
Every now and then when i simulate something (antenna for example) in a system with periodic boundaries, I will see large E-fields at the boundary where they shouldn't be. It seems to be an artifact of the simulation. I tried improving the mesh quality near the boundary in order to decrease the coupling with the rest of the domain but I don't see a quick solution. Has anyone encountered this before and do you know what might solve this problem?
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Hi Robert,
For electromagnetic formulations using curl (vector/Nedelec) elements, periodic conditions and assembly pair boundary conditions require conforming meshes on the source and destination sides to guarantee numerical stability. Without it, you are bound to get spurious effects and unreliable results. In COMSOL, the physics controlled meshing imposes this by a copy mesh operation on the face level (before meshing the interior). However, if you build a custom mesh, you need to take care of that yourself.
Best regards,
-------------------Magnus