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how to define material pixel by pixel?

Posted 22 févr. 2017, 08:59 UTC−5 Low-Frequency Electromagnetics, Materials Version 5.2a 7 Replies

Leyla Roohisefat
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Hi,
Does anyone have any idea that how I can define my material pixel by pixel? Thank you in advance.
7 Replies Last Post 23 févr. 2017, 12:05 UTC−5
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 22 févr. 2017, 14:20 UTC−5
In COMSOL, you can type in spatially-varying functions for your material properties.
If, for instance, you want an electric conductivity to vary as 1+x, simply type 1+x in the text field for the electric conductivity.
There are many pre-implemented mathematical functions for you to use. Please refer to the Reference Manual for COMSOL Multiphysics, version 5.2a, around page 232.
Best,
Jeff
In COMSOL, you can type in spatially-varying functions for your material properties. If, for instance, you want an electric conductivity to vary as 1+x, simply type 1+x in the text field for the electric conductivity. There are many pre-implemented mathematical functions for you to use. Please refer to the Reference Manual for COMSOL Multiphysics, version 5.2a, around page 232. Best, Jeff
Leyla Roohisefat
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Posted: 8 years ago 23 févr. 2017, 04:17 UTC−5
Thanks for your reply. Unfortunately values can not be define by a function.
Thanks for your reply. Unfortunately values can not be define by a function.
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 23 févr. 2017, 07:56 UTC−5
How are they defined?
Jeff
How are they defined? Jeff
Leyla Roohisefat
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Posted: 8 years ago 23 févr. 2017, 08:43 UTC−5
They are defined by a matrix. for each voxel there is a different value.
They are defined by a matrix. for each voxel there is a different value.
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 23 févr. 2017, 09:08 UTC−5
You have several possibilities. Off the top of my head: interpolation functions, image functions and calling a MATLAB function (that last one assumes you have LiveLink for MATLAB on your license). See the COMSOL Multiphysics Reference Manual's section on functions for more info on these options.
Best,
Jeff
You have several possibilities. Off the top of my head: interpolation functions, image functions and calling a MATLAB function (that last one assumes you have LiveLink for MATLAB on your license). See the COMSOL Multiphysics Reference Manual's section on functions for more info on these options. Best, Jeff
Leyla Roohisefat
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Posted: 8 years ago 23 févr. 2017, 10:23 UTC−5
I think Interpolation function can help in this case. Thank you very much for your help!
I think Interpolation function can help in this case. Thank you very much for your help!
Suresh Seetharam
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Posted: 8 years ago 23 févr. 2017, 12:05 UTC−5
Hello,


Just to supplement Jeff's response, an interesting post to look into (Walter Frei's response).

www.comsol.it/community/forums/general/thread/1381


Suresh
Hello, Just to supplement Jeff's response, an interesting post to look into (Walter Frei's response). https://www.comsol.it/community/forums/general/thread/1381 Suresh

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