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Electric field component as Er,Ephi,Ea instead of Ex,Ey,Ez

Posted 31.05.2017, 12:13 GMT-4 2 Replies

Christian Niclaas Saggau
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I simulate a circular cavity as a 2D simulation - due to the symmetry of the system it would be handy to obtain the field directly as cylindrical components without the need to export and post process the data. Is this possible? If I introduce a local cylindrical coordinate system comsol seems to change the solver to cylindrical coordinates but somehow I cannot access the data.
So am I doing something wrong?

2 Replies Last Post 04.06.2017, 13:43 GMT-4
Robert Koslover Certified Consultant
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Posted: 8 years ago 31.05.2017, 20:46 GMT-4
Updated: 8 years ago 31.05.2017, 20:47 GMT-4
1. Are you using the 2D axi-symmetric formalism? If so, your working variables are already in cylindrical form. For example, in the electromagnetic wave RF module, you have: emw.Er, emw.Ephi, and emw.Ez

2. If you are using the 2D cartesian formalism (where z extends infinitely), then you can always extract polar coordinates from the x and y ones via the customary transformations. You can write the expressions in Comsol Multiphysics; you don't have to export the data. Note: To get the correct quadrant for the phi angle, consider using the atan2 function.



1. Are you using the 2D axi-symmetric formalism? If so, your working variables are already in cylindrical form. For example, in the electromagnetic wave RF module, you have: emw.Er, emw.Ephi, and emw.Ez 2. If you are using the 2D cartesian formalism (where z extends infinitely), then you can always extract polar coordinates from the x and y ones via the customary transformations. You can write the expressions in Comsol Multiphysics; you don't have to export the data. Note: To get the correct quadrant for the phi angle, consider using the atan2 function.
Christian Niclaas Saggau
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Posted: 8 years ago 04.06.2017, 13:43 GMT-4
Thanks alot that worked greath - I did not know that I can put a formula about anywhere in Comsol.
Thanks alot that worked greath - I did not know that I can put a formula about anywhere in Comsol.

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