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calculate the gradient of solid.pm

Posted 2016年5月1日 GMT-4 09:27 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 2016年5月4日 GMT-4 02:08
Henrik Sönnerlind COMSOL Employee

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Posted: 8 years ago 2016年5月2日 GMT-4 05:50
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: 8 years ago 2016年5月3日 GMT-4 04:38
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: 8 years ago 2016年5月4日 GMT-4 02:08
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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