For the mode partition, you can try to use the "Multimode Waveguide" element: https://optics.ansys.com/hc/en-us/articles/360036618693-Multimode-Waveguide-WGD-INTERCONNECT-Element, and you can define individual dispersion on different modes. For the TWLM problem, it's better for us to view the file to be able to tell the problem. Do you have access to premium support?
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