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access components of a vector

Posted 06.03.2011, 04:48 GMT-5 RF & Microwave Engineering, Parameters, Variables, & Functions Version 3.5a 3 Replies

amin khan
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Hi

I am newbie for comsol. I want to integrate the cross product between Electric field components (Ex,Ey,Ez) and radius vector (r -originating from the origin [0,0,0]) defined as r=sqrt(x^2+y^2+z^2) inside a domain (volume). integral ( r x E)

I am unable to figure out how to use the vector components of radius vector r. So that I am able to define them as global variable by evaluating the following expression.

| i j k |
| rx ry rz |
| Ex Ey Ez |

Later I could integrate them on the desired domain.

P.S. I am using comsol version 3.5a.

Thanks,
3 Replies Last Post 06.03.2011, 08:10 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 06.03.2011, 06:21 GMT-5
Hi

I'm not fully following you:

rx,ry,rz isn't that your x,y,z ?

and the integration of a cross product isn't it a vector integration so its three integrations ?

of the type (int(y*Ez-z*Ey), -int(x*Ez-z*Ex), int(x*Ey-y*Ex))

I might have got the cross product up side down, pls check, and I might have completely missed your poit ;)

--
Good luck
Ivar
Hi I'm not fully following you: rx,ry,rz isn't that your x,y,z ? and the integration of a cross product isn't it a vector integration so its three integrations ? of the type (int(y*Ez-z*Ey), -int(x*Ez-z*Ex), int(x*Ey-y*Ex)) I might have got the cross product up side down, pls check, and I might have completely missed your poit ;) -- Good luck Ivar
amin khan
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Posted: 1 decade ago 06.03.2011, 06:28 GMT-5
Thanks Ivar for the answer. I must admit it turned out to be a silly question ;).
Thanks Ivar for the answer. I must admit it turned out to be a silly question ;).
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 06.03.2011, 08:10 GMT-5
Hi

no questions are silly, replies might b, often one manage to give onself a reply by asking the question ;)

--
Good luck
Ivar
Hi no questions are silly, replies might b, often one manage to give onself a reply by asking the question ;) -- Good luck Ivar

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