Chunying,
I ran your model in comsol 5.1. and first of all I've got a different message (it says, the error is larger than the tolerance). I only have my laptop today and hence cannot investigate deeper, but I would guess, that the mesh is to coarse, i.e. around the solid - fluid interface. You may want to refine it, i.e. decrease the maximum element grow rate of your tetrahedral section.
I've checked the solver settings,too, and for me it seems to be alright. But I case of doubt, ask the support, they're being rather helpful.
Hope that helps a bit.
Hi Stefan,
Thank you so much for pay attention to my question, I agree with you. However, what confused me is that my model is linear problem, but it shows nonlinear solver. Besides,I have refine the mesh ,but the problem cannot be solved.
Thank you again,
Chunying
Thank you all, I still cannot solve this problem, I also think there is something wrong with the mesh plot, but I revised it several times, it still can not work.
I have solved this problem, because I have simply mistake, when I definite the PMLs, the center coordinate is not in according with the geometry . Thank you for your attention!
That is my experience, too. In 90% of the cases, it is nothing sophisticated, but just a stupid mistake... One does not need to be stupid ,though, to make stupid mistakes. They just happen from time to time.
Good luck with your research.
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