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Urgent: Coordinate system

Posted Nov 1, 2010, 4:38 p.m. EDT 7 Replies

Avineet Ponde
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Hello everybody,

Can you please let me know if we can change the coordinate system or rather define a local coordinate system in the RF module? I am using version 3.5a.

Further, please let me know as to how can we define a gaussian beam at an angle using the RF module for transient analysis.

Thanking you in anticipation,

Avineet
7 Replies Last Post Mar 29, 2011, 6:36 p.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Nov 2, 2010, 2:20 a.m. EDT
Hi

you can define a local coordinate system, see the doc and search on the knowledge base there are examples.

For the Gaussian beam you need normally to define the transverse Gaussian field distribution (by an equation) and the propagation vector k, but now I havent done it in 3.5 for so long that I'm already forgetting the detailes of the "old" COMSOL specialities ;)

--
Good luck
Ivar
Hi you can define a local coordinate system, see the doc and search on the knowledge base there are examples. For the Gaussian beam you need normally to define the transverse Gaussian field distribution (by an equation) and the propagation vector k, but now I havent done it in 3.5 for so long that I'm already forgetting the detailes of the "old" COMSOL specialities ;) -- Good luck Ivar
Avineet Ponde
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Posted: 1 decade ago Nov 2, 2010, 12:17 p.m. EDT
Hello Ivar,

Thanks for your help. But it seems that it is not possible to define a local coordinate system in the RF module. Is it possible in version 4.0?

Thank you,

Avineet
Hello Ivar, Thanks for your help. But it seems that it is not possible to define a local coordinate system in the RF module. Is it possible in version 4.0? Thank you, Avineet
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Nov 4, 2010, 2:44 a.m. EDT
Hi

yes in V4 you acn , in 3.5 then you must do it by "hand" and check that your values transformed back into the cartesian system still are valid

--
Good luck
Ivar
Hi yes in V4 you acn , in 3.5 then you must do it by "hand" and check that your values transformed back into the cartesian system still are valid -- Good luck Ivar
Avineet Ponde
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Posted: 1 decade ago Nov 5, 2010, 10:04 a.m. EDT
Hello Ivar,

Does that mean I have to transform all the built-in equations(in the Equation System) in COMSOL to the new co-ordinate system too?

Thanks
Hello Ivar, Does that mean I have to transform all the built-in equations(in the Equation System) in COMSOL to the new co-ordinate system too? Thanks
Avineet Ponde
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Posted: 1 decade ago Nov 5, 2010, 10:30 a.m. EDT
Hello Ivar,

Is it possible to change the k (wave direction) in the 3.5 version of COMSOL? If yes, how do I change the wave direction?

Further, do I transform the equations written in the expression option itself or elsewhere? I need to chenge the wave direction somehow and I am not getting how to do it.

Thanks a lot,

Avineet
Hello Ivar, Is it possible to change the k (wave direction) in the 3.5 version of COMSOL? If yes, how do I change the wave direction? Further, do I transform the equations written in the expression option itself or elsewhere? I need to chenge the wave direction somehow and I am not getting how to do it. Thanks a lot, Avineet
Avineet Ponde
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Posted: 1 decade ago Nov 5, 2010, 2:33 p.m. EDT
Thanks a lot Ivar.

I finally got an inclined beam.

Regards,

Avineet
Thanks a lot Ivar. I finally got an inclined beam. Regards, Avineet
Kirthika Nahalingam
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Posted: 1 decade ago Mar 29, 2011, 6:36 p.m. EDT
Hi Avineet,

Could you please say how to define a gaussian beam in RF module, as you have already worked on it.
and also to give inclination.

Hi Avineet, Could you please say how to define a gaussian beam in RF module, as you have already worked on it. and also to give inclination.

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