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general pde mode, spherical coordinates

Posted 10.03.2011, 15:52 GMT-5 6 Replies

Parviz Ahmadian
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Hi, everybody
I want to solve a differential equation in spherical coordinates (just “R” component dependent)
By “General PDE mode” (comsol3.4).
But there is no default spherical coordinates in the comsol .
Now how can I resolve this problem?
The simulation geometry is as following:
A----------------------------------------B
Regards
parviz
6 Replies Last Post 20.02.2013, 13:13 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 11.03.2011, 01:24 GMT-5
Hi

define the coordinate yourself, see the KB (and other treads on the FORUM)

--
Good luck
Ivar
Hi define the coordinate yourself, see the KB (and other treads on the FORUM) -- Good luck Ivar
Parviz Ahmadian
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Posted: 1 decade ago 11.03.2011, 13:33 GMT-5
thanks ivar

but i can not find the KB.

can i pre-arrenge the my equation and so, use the cartesian coordinates?

regards
parviz
thanks ivar but i can not find the KB. can i pre-arrenge the my equation and so, use the cartesian coordinates? regards parviz
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 11.03.2011, 15:34 GMT-5
Hi

sorry, KB is the sort for the official Knowledge Base of COMSOL


www.comsol.eu/support/knowledgebase/browse/900/

--
Good luck
Ivar
Hi sorry, KB is the sort for the official Knowledge Base of COMSOL http://www.comsol.eu/support/knowledgebase/browse/900/ -- Good luck Ivar
Parviz Ahmadian
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Posted: 1 decade ago 12.03.2011, 15:20 GMT-5
thanks ivar

regards
parviz
thanks ivar regards parviz
Stefano Iannacone
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Posted: 1 decade ago 20.02.2013, 08:26 GMT-5
Hi

I am facing the same problem you had few years ago. Could you please tell me how you solved this issue?
I have to model mass transport in spherical coordinates.

I cannot access to KB that's why I am asking.

Thanks in advance
Hi I am facing the same problem you had few years ago. Could you please tell me how you solved this issue? I have to model mass transport in spherical coordinates. I cannot access to KB that's why I am asking. Thanks in advance
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 20.02.2013, 13:13 GMT-5
Hi

you can define the spherical coordinate system, andthen use the references of the "user coordinate" system "sys2..." to define or transform your variable (oth ways actually)

But COMSOL by default work in cartesian coordiantes so you need to map ack and perhaps, for the results forward ;)

--
Good luck
Ivar
Hi you can define the spherical coordinate system, andthen use the references of the "user coordinate" system "sys2..." to define or transform your variable (oth ways actually) But COMSOL by default work in cartesian coordiantes so you need to map ack and perhaps, for the results forward ;) -- Good luck Ivar

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