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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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finer circle resolution

Posted Aug 13, 2011, 9:48 a.m. EDT Low-Frequency Electromagnetics, Geometry, Mesh, Results & Visualization Version 4.1, Version 4.2 2 Replies

Norbert Bartscher
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Hello,

I am simulating electrical machines with the .rmm physics and was wondering, if it is somehow possible to get circles/curves with a higher resolution. When I take a close look at my air gap, I can see relatively big corners.
At first I thought this happend somehow because I imported a CAD model. But when I created a new model within the COMSOL GUI, the same problem appears. Or is it maybe just a visual problem?

Thanks in advance
2 Replies Last Post Jun 19, 2012, 5:49 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Aug 13, 2011, 12:55 p.m. EDT
Hi

you have different levels to check / control

1) the CAD generation and CAD import relative error (when importing external CAD geometry)
2) the grapohical rendering of COMSOl only a visual effect, check your preferences
3) the meshing resolution, during the meshing phase

1) is for me the most delicate and easy to forget, 2) is only a visula effect, but can be tricky for surface/line/point graphical selection and for your graphical display bandwidth and 3) is related to your calculations expectations (and time + RAM available)

Hope this helps

--
Good luck
Ivar
Hi you have different levels to check / control 1) the CAD generation and CAD import relative error (when importing external CAD geometry) 2) the grapohical rendering of COMSOl only a visual effect, check your preferences 3) the meshing resolution, during the meshing phase 1) is for me the most delicate and easy to forget, 2) is only a visula effect, but can be tricky for surface/line/point graphical selection and for your graphical display bandwidth and 3) is related to your calculations expectations (and time + RAM available) Hope this helps -- Good luck Ivar
Francesc-Xavier Borras
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Posted: 1 decade ago Jun 19, 2012, 5:49 a.m. EDT
Hej,

I had the same problem. The problem comes when applying some Boolean Operation to this circular geometry.

It helped me to decrease the "Relative Repair Tolerance" (default 10e-6) in the option on the specific Boolean Operation (for example to 1e-12).

Hope that helps,

F. Xavier Borras
Hej, I had the same problem. The problem comes when applying some Boolean Operation to this circular geometry. It helped me to decrease the "Relative Repair Tolerance" (default 10e-6) in the option on the specific Boolean Operation (for example to 1e-12). Hope that helps, F. Xavier Borras

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