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add mechanical damping, not convergence

Posted 8 mag 2017, 09:16 GMT-4 3 Replies

Sandra Wang
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When I compute a piezoelectric transducer in a water domain, the solution works well and convergence. However, when I add mechanical damping to the piezoelectric material and keep others all the same, the solution can not convergence, I am wondering why?
have a good day.
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sandra wang
3 Replies Last Post 9 mag 2017, 10:17 GMT-4
Henrik Sönnerlind COMSOL Employee

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Posted: 8 years ago 8 mag 2017, 10:14 GMT-4
Hi Sandra,

You have not specified what type of study, or what type of damping, you are using when you get the problem. Without that, it is difficult to tell.

Regards,
Henrik
Hi Sandra, You have not specified what type of study, or what type of damping, you are using when you get the problem. Without that, it is difficult to tell. Regards, Henrik
Sandra Wang
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Posted: 8 years ago 8 mag 2017, 22:32 GMT-4

Hi Henrik,

The study is frequency domain, I only add mechanical damping 0.05 to the piezoelectric material, then the model begin not to convergence in the solution. Although the damping value is very small, still not convergence, but if the value is zero, the model works well.
Best Regards
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sandra wang
Hi Henrik, The study is frequency domain, I only add mechanical damping 0.05 to the piezoelectric material, then the model begin not to convergence in the solution. Although the damping value is very small, still not convergence, but if the value is zero, the model works well. Best Regards -- sandra wang
Henrik Sönnerlind COMSOL Employee

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Posted: 8 years ago 9 mag 2017, 10:17 GMT-4
Hi,

This is an anomalous behavior, since such damping should stabilize the model numerically. I suspect something is strange in the setup of your model.

Henrik
Hi, This is an anomalous behavior, since such damping should stabilize the model numerically. I suspect something is strange in the setup of your model. Henrik

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