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general pde mode, spherical coordinates

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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 Feb 20, 2013, 1:13 PM EST

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Posted: 9 years ago Mar 11, 2011, 1:24 AM EST
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

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Posted: 9 years ago Mar 11, 2011, 1:33 PM EST
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

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Posted: 9 years ago Mar 11, 2011, 3:34 PM EST
Hi

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


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

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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

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Posted: 9 years ago Mar 12, 2011, 3:20 PM EST
thanks ivar

regards
parviz
thanks ivar regards parviz

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Posted: 7 years ago Feb 20, 2013, 8:26 AM EST
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

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Posted: 7 years ago Feb 20, 2013, 1:13 PM EST
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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