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voltage at different coordinates

Posted Feb 5, 2013, 9:13 p.m. EST Version 3.5a, Version 4.0, Version 4.0a, Version 4.1, Version 4.2 4 Replies

Adnan Farooq
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Hello every one.

it is possible in COMSOL to fine the voltage at (x,y,z) coordinates?

thank you
4 Replies Last Post Feb 7, 2013, 7:31 a.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Feb 6, 2013, 12:54 a.m. EST
Hi

when you solve in EC for the Volts, you get a "filed" V(x,y,z) as results, see your plot. But the COMSOL convention is too drop the (x,y,z) and write only V. At the beginning I found it very confusing to distinguish a scalar, a field or an implicit function, with the time you get used to it.

When you plot the voltage over a domain you get V(x,y,z) shown

--
Good luck
Ivar
Hi when you solve in EC for the Volts, you get a "filed" V(x,y,z) as results, see your plot. But the COMSOL convention is too drop the (x,y,z) and write only V. At the beginning I found it very confusing to distinguish a scalar, a field or an implicit function, with the time you get used to it. When you plot the voltage over a domain you get V(x,y,z) shown -- Good luck Ivar
Adnan Farooq
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Posted: 1 decade ago Feb 7, 2013, 12:12 a.m. EST
thanks Ivar for the nice explanation,
I would like to ask one more thing i want to attach electrodes to my model and electrodes is in cylinderical shape. and the surface where i want to attach is not very smooth it has many curves, adding the electrode using Union operation. i check the Sub-domain and i go 2 sub-domains of that electrode, it is possible to add two sub-domain to 1? or how can i make 1 subdomain


Thanks
thanks Ivar for the nice explanation, I would like to ask one more thing i want to attach electrodes to my model and electrodes is in cylinderical shape. and the surface where i want to attach is not very smooth it has many curves, adding the electrode using Union operation. i check the Sub-domain and i go 2 sub-domains of that electrode, it is possible to add two sub-domain to 1? or how can i make 1 subdomain Thanks
Adnan Farooq
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Posted: 1 decade ago Feb 7, 2013, 12:12 a.m. EST
thanks Ivar for the nice explanation,
I would like to ask one more thing i want to attach electrodes to my model and electrodes is in cylinderical shape. and the surface where i want to attach is not very smooth it has many curves, adding the electrode using Union operation. i check the Sub-domain and i go 2 sub-domains of that electrode, it is possible to add two sub-domain to 1? or how can i make 1 subdomain


Thanks
thanks Ivar for the nice explanation, I would like to ask one more thing i want to attach electrodes to my model and electrodes is in cylinderical shape. and the surface where i want to attach is not very smooth it has many curves, adding the electrode using Union operation. i check the Sub-domain and i go 2 sub-domains of that electrode, it is possible to add two sub-domain to 1? or how can i make 1 subdomain Thanks
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Feb 7, 2013, 7:31 a.m. EST
Hi

by the way "sub-domains are called "only" Domains in V4.
Yes you can normally combine many domains, either with a union or a build solid or ... but personally I often split my domains, to make them easier to mesh, to select "internal" boundaries for flux or integration postprocessing operations, so normally there is no absolute need to group things.

Sometimes though COMSOL has problems with complex imported geoemtries, in fact I have noticed it arrives when we import "geometries" with some of the formats that do not consider volumes as such, but as grouped tesselated structures, such as DXF, STL, ... Then COMSOL might not manage to recreate a closed volume, or surface from the info received, or things get turned inside out, 3D topology is not trivial. Workaround, use some of the more "solid" 3D formats, such as PArasolid, STEP, or other propretarian Kernel formats

--
Good luck
Ivar
Hi by the way "sub-domains are called "only" Domains in V4. Yes you can normally combine many domains, either with a union or a build solid or ... but personally I often split my domains, to make them easier to mesh, to select "internal" boundaries for flux or integration postprocessing operations, so normally there is no absolute need to group things. Sometimes though COMSOL has problems with complex imported geoemtries, in fact I have noticed it arrives when we import "geometries" with some of the formats that do not consider volumes as such, but as grouped tesselated structures, such as DXF, STL, ... Then COMSOL might not manage to recreate a closed volume, or surface from the info received, or things get turned inside out, 3D topology is not trivial. Workaround, use some of the more "solid" 3D formats, such as PArasolid, STEP, or other propretarian Kernel formats -- Good luck Ivar

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