Search found 49 matches

by crobar
20 Aug 2016, 01:35
Forum: ElmerSolver
Topic: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy
Replies: 30
Views: 11337

Re: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy

Hi Now the question is whether this would be usefull to your purposes? Is a circular closed path something that could be applied? Currently the circle is defined by one point, the normal of the cylinder axis, and a radius i.e. 7 parameters. -Peter Well, not exactly. The circular coil example is onl...
by crobar
19 Aug 2016, 18:19
Forum: ElmerSolver
Topic: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy
Replies: 30
Views: 11337

Re: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy

I'm a bit confused over which surface the flux is to be calculated? It seems, however, somehow sensible to only consider line integrals of the vector potential instead of surface integrals because only the boundary line and vector potential on it matter in terms of flux.. -Juhani Well, in the examp...
by crobar
17 Aug 2016, 12:53
Forum: ElmerSolver
Topic: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy
Replies: 30
Views: 11337

Re: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy

What I'm trying to say that even though generally computing the flux with line integrals might seem easy. In terms of clean and reliable workflow, it is irrelevant. Cheers, Juhani Thanks, I appreciate your explanation and advice, but I'm still not sure how to easily apply it for a typical generator...
by crobar
16 Aug 2016, 12:47
Forum: ElmerSolver
Topic: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy
Replies: 30
Views: 11337

Re: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy

Hi, note also that integrating the normal component of the variable "magnetic flux density e" over some surface gives you exactly the right line integral of vector potential over its boundary (see SaveData module and convective flux operator). Internally, the "e" field is of first order (or higher)...
by crobar
12 Aug 2016, 19:28
Forum: ElmerSolver
Topic: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy
Replies: 30
Views: 11337

Re: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy

Actually I reread your post, will try other key word, thanks, but still interested in vector pot
by crobar
12 Aug 2016, 19:25
Forum: ElmerSolver
Topic: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy
Replies: 30
Views: 11337

Re: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy

Hi! I don't think its fruitful to compare the vector potential because its not unique even though its integrals over surface edges are. For the "discontinuous bodies" keyword to take effect, you should investigate the variable "Magnetic Flux Density e" instead of "magnetic flux density" (in solver ...
by crobar
12 Aug 2016, 14:09
Forum: ElmerSolver
Topic: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy
Replies: 30
Views: 11337

Re: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy

Are you sure that the iterative solvers have been solved with sufficient accuracy? I'm pretty sure. I set the tolerance both Linear System Convergence Tolerance = 1.0e-8 and Steady State Convergence Tolerance = 1e-8 for the most recent examples, is there something else I should change? One could tr...
by crobar
11 Aug 2016, 18:50
Forum: ElmerSolver
Topic: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy
Replies: 30
Views: 11337

Re: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy

I will have a look into using the Tree Guage as a starting point.

To make sure it's not something I've done in my post processing, here's a screenshot of the same measurements in Paraview:
measuring_in_paraview.png
(334.5 KiB) Not downloaded yet
It actually looks much worse!
by crobar
11 Aug 2016, 15:29
Forum: ElmerSolver
Topic: VTU
Replies: 5
Views: 2347

Re: VTU

I you can also in paraview save the data as a csv if you want. I've written a function to load a vtu file into Matlab (or Octave) if anyone's interested. At some point I'll upload it somewhere probably.
by crobar
11 Aug 2016, 15:16
Forum: ElmerSolver
Topic: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy
Replies: 30
Views: 11337

Re: Elmer Magnetics 3D comparison with 2D Axisymmetric Lumpy

Well, the vector potential is important as this is used to compute important quantities, in particular the flux linkage in a coil by integrating directly on the A field (see http://www.elmerfem.org/forum/viewtopic.php?f=3&t=4311&p=15365&hilit=flux+linkage&sid=1dede02ca1684bbdbb4b712542c685ff#p15365 ...