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calculate the gradient of solid.pm

Posted May 1, 2016, 9:27 a.m. EDT Materials, Parameters, Variables, & Functions Version 5.0 3 Replies

永乐 刘
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the result of d(solid.pm,z) is zero,how can I get the gradient of solid.pm
3 Replies Last Post May 4, 2016, 2:08 a.m. EDT
Henrik Sönnerlind COMSOL Employee

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Posted: 9 years ago May 2, 2016, 5:50 a.m. EDT
Hi,

You should take the gradient with respect to the material coordinates, that is d(solid.pm,Z), instead.

Regards,
Henrik
Hi, You should take the gradient with respect to the material coordinates, that is d(solid.pm,Z), instead. Regards, Henrik
永乐 刘
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Posted: 9 years ago May 3, 2016, 4:38 a.m. EDT
thanks for your help.but the result of d(solid.pm,Z) is 0.
thanks for your help.but the result of d(solid.pm,Z) is 0.
Henrik Sönnerlind COMSOL Employee

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Posted: 9 years ago May 4, 2016, 2:08 a.m. EDT
Hi,

What kind of material model, element shape, and discretization is ti in the model? If for example solid.pm is constant over each element, its derivative would be zero even if it looks like a smooth field when averaged in a plot.

Regards,
Henrik
Hi, What kind of material model, element shape, and discretization is ti in the model? If for example solid.pm is constant over each element, its derivative would be zero even if it looks like a smooth field when averaged in a plot. Regards, Henrik

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