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Merging 2 models

Posted 25 nov. 2012, 22:18 UTC−5 Version 4.3 4 Replies

Ammar Mahmood
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I have a Comsol Model of a Maxwell Coil and a model of Helmhotlz coil with defined geometries. Now I want to make a simulation in which I can place these 2 coils together and simulate their magnetic flux density. How can I do that?
4 Replies Last Post 29 nov. 2012, 03:37 UTC−5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 26 nov. 2012, 01:04 UTC−5
Hi

you need to rebuild your model with both, and merge the physics into one as normally these two system will interact.

If you operate in stationary mode, you might use the sum of the two separate cases as a good starting point, in AC mode you might end up with cross coupling that changes far more your fields

--
Good luck
Ivar
Hi you need to rebuild your model with both, and merge the physics into one as normally these two system will interact. If you operate in stationary mode, you might use the sum of the two separate cases as a good starting point, in AC mode you might end up with cross coupling that changes far more your fields -- Good luck Ivar
Ammar Mahmood
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Posted: 1 decade ago 27 nov. 2012, 03:28 UTC−5
Thanks. I successfully merged these 2 models. Now I want to get plot for ''Gradient'' of magnetic flux density. Is there a built-in operator for ''gradient (Del Function)'' ?

en.wikipedia.org/wiki/Gradient
Thanks. I successfully merged these 2 models. Now I want to get plot for ''Gradient'' of magnetic flux density. Is there a built-in operator for ''gradient (Del Function)'' ? http://en.wikipedia.org/wiki/Gradient
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 27 nov. 2012, 05:21 UTC−5
Hi

not for the gradient as such, but the component yes, check the doc, the dependent variables have their derivatives in subscript x,y,z,r,t respectively 2nd derivatives in xx,xy,yy,zz, tt...

but for vector fields the x,y,z,r might also define a coordinate component, this is context dependent, needs some time to learn

Not that by default the discretization is 2nd order (if your mesh i good), so you might derive 2 times, but the 2nd derivative is staircase function, in EM B is already the derivative of A, so deriving further might be done cleaner by increasing the discretization order of your model (but this increases the DoFs hence the need for RAM and time to solve)

--
Good luck
Ivar
Hi not for the gradient as such, but the component yes, check the doc, the dependent variables have their derivatives in subscript x,y,z,r,t respectively 2nd derivatives in xx,xy,yy,zz, tt... but for vector fields the x,y,z,r might also define a coordinate component, this is context dependent, needs some time to learn Not that by default the discretization is 2nd order (if your mesh i good), so you might derive 2 times, but the 2nd derivative is staircase function, in EM B is already the derivative of A, so deriving further might be done cleaner by increasing the discretization order of your model (but this increases the DoFs hence the need for RAM and time to solve) -- Good luck Ivar
Ammar Mahmood
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Posted: 1 decade ago 29 nov. 2012, 03:37 UTC−5
I made mph model and to calculate gradient i want to import mph model in MATLAB. Is comsol 4.3 compatible with matlab R2011a?

I made mph model and to calculate gradient i want to import mph model in MATLAB. Is comsol 4.3 compatible with matlab R2011a?

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