[Getdp] problems trying to couple Electrostatics and Magnetostatics

Henrique Nunes Braga henriquen at gmail.com
Fri Apr 7 21:14:15 CEST 2006


Hello Thomas,

The magnetostatic formulation in our file:

 { Name Magnetostatics_a_3D; Type FemEquation;
   Quantity {
     { Name a ; Type Local; NameOfSpace Hcurl_a_Mag_3D; }
     { Name v; Type Local; NameOfSpace v_Ele; }
   }
   Equation {
       Galerkin { [ nu[] * Dof{d a} , {d a} ]; In Domain_Mag; Jacobian Vol;
Integration CurlCurl; }
       Galerkin { [ -sigma[] * Dof{d v} , {a} ]; In DomainC_Mag; Jacobian
Vol; Integration CurlCurl; }
   }
 }

seems that is not valid for 3D domain.

Henrique Nunes Braga


2006/4/7, Thomas Jung <Thomas.Jung at iisb.fraunhofer.de>:
> Hi everybody,
>
> I am trying to calculate first the electrical potential in a rod, and from
> that the current and magnetic field. Its a very simple 3D-case - just a
> conducting rod, and a non-conducting cube around.
>
> There is a resolution "current": potentials at ends of rod are prescribed,
> field is computed, works fine.
>
> Then I have a resolution MagSta_a_3D, which, if I prescribe a fixed source
> current js in the rod, also works and gives me a reasonably looking magnetic
> field (well, except at the boundaries, or contact surfaces, where the
> magnetic field shows some strange arrows - maybe I have some boundary
> condition wrong here ?)
>
>  However, when I try to couple both in resolution "both", the resulting fields
> and currents are completely wrong - there are current vectors only on the
> contact surface where I prescribe the electrical potential.
>
> Thank you very much for any hint !
>
>
>
>
> --
> Thomas Jung
> Fraunhofer-Institut IISB
> D-91058 Erlangen, Schottkystr. 10
> +49 9131 761264




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