Hi, I am simulating a Gate Valve Liner using frequency domain solver. One of the most frequent warning that I got is "Some modes with polarization degeneracy exist at port 1. Please define a polarization angle or polarization lines in the port properties dialog to make the modes unique". I have tried to simulate with a polarization angle of zero degree but it says your system memory is low while simulating and I could not be able to get the S-parameters. I am simulating the gate valve liner with two wave guide port at ends and with number of modes 2. Does the first error message affect on my simulation result?
It does in the way how degenerated modes will be shown but If you not define the angle the CST will choose it automatically. The second error is not related with the first one. Probably, the root of the second error related with extra-fine mesh. If you use tetrahedral mesh with high-order elements, than your need be sure that you have enough RAM.
Thank you Makhalvov. I did not know that CST does choose polarization automatically.
This sort of messages most often is not relevant, I just wonder why it impacts on the memory requirements... Regardless, I would suggest (if possible) using symmetries, they would naturally pick the correct expected mode of your structure, eliminating additional modes that may appear.
Thank you Marcelo for the response. I did not quite get about using symmetries. Do you mean symmetries of S-parameters?
Hi Medani
Nope, I meant symmetries in the boundary conditions window - geometrically speaking, if your structure has electric ou magnetic symmetry you can tell CST about it, reducing the simulation time.
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