Problems with Induction Heating tutorial

[davost]

Hello Elmer folks.
I am new to the Elmer software and I am trying to follow the Induction Heating tutorial.
However I get strange results when plotting the B-field. The fieldlines doesnt seam to close. Can you give me some hints on what I am missing?

See the attached plots.

strange_magnetic_flux.png

The magnetic flux density vector field.

(158.63 KiB) Not downloaded yet

strange_stremlines_of_magnetic_flux.png

Joule heating with the streamlines of the magnetic flux density superimposed

(140.7 KiB) Not downloaded yet

Edit: Changed the captions of the attachements.

Also note that the absolute value of the B-field looks realistic. Only the orientation is suspect to me.
I have ElmerSolver 5.5.0 running on Ubuntu. I also tried with the Windows nightly build with the same result.

Thanks for your help
Regards
David

[davost]

After consulting the Models Manual and reading the source code file StatMagSolve.f90 I think I understand a bit more. What is called the magnetic flux in this model is in fact not defined for a particular instance in time but rather as the amplitude of the B-field over a period of oscillation.

I now understand that this is what one needs in order to estimate hysteretic losses.

Anyway, in order to have a look at the B-field I commented away these lines in the source file and recompiled. (probably there is a smarter way but what the heck)

! Br(j) = SQRT( Br(j)**2 + Brim(j)**2 )
! Bz(j) = SQRT( Bz(j)**2 + Bzim(j)**2 )
! Brim(j) = 0.0d0
! Bzim(j) = 0.0d0

Now I got this beautiful plot .

nice_streamlines_of_magnetic_flux.png

Streamlines and joule heating at a particular time.

(89.5 KiB) Not downloaded yet

Thanks for a great tool
David