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Not converged but correct?
Posted 23.12.2014, 13:45 GMT-5 RF & Microwave Engineering Version 5.0 2 Replies
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I'm doing a 3D EM waveguide problem with boundarymodeanal + frequency domain. My solution looks accurate and passes numerous checks inculding matching almost exactly with theory and 2D and 3D variously simplified yet similar models that show no convergence issues at all.
The thing is, the 3D solver isn't "converging" for my full up model. Most recently I've been using GMRES and it flatlines when the error gets down to about 5. At this point I'll hit the STOP button on GMRES and accept the results. BiCSTAB also fails to converge (but seems more erratic than GMRES).
As I said, these results look evedently correct; I've studied them quite a bit, and they look good, yet no doubt there is a high error hiding in some nook or cranny someplace. Does anybody know a good trick for localizing where a convergence problem is "lurking" in a generally correct EM wave frequency domain solution? For example, if an error field could be plotted across the 3D mesh rather than just as a single "ERROR" number, it would help a lot.
The thing is, the 3D solver isn't "converging" for my full up model. Most recently I've been using GMRES and it flatlines when the error gets down to about 5. At this point I'll hit the STOP button on GMRES and accept the results. BiCSTAB also fails to converge (but seems more erratic than GMRES).
As I said, these results look evedently correct; I've studied them quite a bit, and they look good, yet no doubt there is a high error hiding in some nook or cranny someplace. Does anybody know a good trick for localizing where a convergence problem is "lurking" in a generally correct EM wave frequency domain solution? For example, if an error field could be plotted across the 3D mesh rather than just as a single "ERROR" number, it would help a lot.
2 Replies Last Post 26.12.2014, 11:13 GMT-5