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If you are just concerned about a simplified model of the board,I know some EDA tools can help you a lot.For a more detailed analysis, you should consider tools like 3D field solvers.And I know that there are some excellent solutions offered by CAD,but of course it's a little expensive.
The tools like Zuken, Mentor and Cadence are all available.Zuken in the past is to simulate mainly high speed interfaces,checking the PCB layout.
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