[Getdp] Magnetodynamics

Raymond Michaux raymond.michaux at freesbee.fr
Mon Nov 30 22:13:09 CET 2009


Hello,

Following the 'Magnetodynamics' example of the Reference Manual, I ran successfully a quasi 1-D model with stranded inductor and a conductive solid core with high permeability. In the frequency domain (attached files ), the results are very close to the analytical solution for the 1-D problem. The time domain analysis is also interesting with a nice animation.
I have however some (small) problems
  a.. In PostOperation, the Print operation for a global value gives an error message : 
  Print[U, OnRegion Core];    =>    GetDP : Warning : Post Format 'Gmsh' not adapted for global quantities supported by Regions. Zero coordinates are considered.

  b.. In the Reference manual, the formulation contains a Galerkin 'Velocity' term with the sign '*^'. To fit with the equations, this is probably a cross product ('/\' in the manual). Is this correct?

  c.. In the PostProcessing for the ComplexValue resolution, az=CompZ[{a}] is saved as a complex value. As a matter of fact, the file "a.pos" contains the real and imag valus of az, but the map shows only the real value. I would like to show the module of az, with something like :

         Name modaz;    

         Value{ Local { [Hypot[Re[CompZ[{a}]],Im[CompZ[{a}]]] ];In Domain_Mag; Jacobian Vol;} }

        May I do that?

  a.. I don't understand very well the Global Quantities U and I. They are defined as 'AliasOf' and 'AssociatedWith' of 'ur' which is the gradient of the scalar potential. The names of contraints suggest that U and I are global values of voltage and current. How are they calculated (in other words, what's hidden behind 'AliasOf' and 'AssociatedWith) ?
Thank you for any clarification.
Regards
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