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"Integration coubling variable" -> from 3.5 to 4.0 or later

Posted 14.06.2013, 12:12 GMT-4 Version 4.0a 2 Replies

Muhammad Noman Hasan
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Hi,

In COMSOL 3.5 or earlier, for "Integration coubling variable", one could go to

option -> Integration coubling variable -> subdomain/boundary/ point variable.

Can anyone tell me how can I do it in COMSOL 4.0 or later for say, boundary variable. like, If I want to integrate temperature/temperature gradient along a boundary, how can I do it. I an kind of confused.

Thanks in advance.
2 Replies Last Post 01.10.2013, 08:04 GMT-4
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Hello Muhammad Noman Hasan

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James Gear
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Posted: 1 decade ago 01.10.2013, 07:36 GMT-4
Hi there,

This was confusing to me as well, you may have already found this out but incase anyone else is confused: you measure variables by 'probes' in 4.0, you can choose subdomain/boundary/edge probes and select your desired variable (though some of the variables have changed from 3.5a, so I'd check which ones you're using).
Hi there, This was confusing to me as well, you may have already found this out but incase anyone else is confused: you measure variables by 'probes' in 4.0, you can choose subdomain/boundary/edge probes and select your desired variable (though some of the variables have changed from 3.5a, so I'd check which ones you're using).
Jeff Hiller COMSOL Employee

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Posted: 1 decade ago 01.10.2013, 08:04 GMT-4
Probes do not serve quite the same purposes as integration coupling variables. If you need to refer to the integral inside your model's equations (as opposed to solely for solution monitoring / post-processing) you will need to use integration model couplings. They can be found in the Model Builder under Model> Definitions> Functions > Model Couplings >Integration. Integration model couplings are similar to integration coupling variables (pre-4.0) but they more flexible because they are operators that can be called to operate on different arguments.

More information on Probes: see Reference Manual, version 4.3b, page 324 and following
More information on Model Couplings: see Reference Manual, version 4.3b, page 283 and following

Jeff
Probes do not serve quite the same purposes as integration coupling variables. If you need to refer to the integral inside your model's equations (as opposed to solely for solution monitoring / post-processing) you will need to use integration model couplings. They can be found in the Model Builder under Model> Definitions> Functions > Model Couplings >Integration. Integration model couplings are similar to integration coupling variables (pre-4.0) but they more flexible because they are operators that can be called to operate on different arguments. More information on Probes: see Reference Manual, version 4.3b, page 324 and following More information on Model Couplings: see Reference Manual, version 4.3b, page 283 and following Jeff

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