[Getdp] basic permant magnet question - please help
Pei-Ying Hsieh
pei-ying.hsieh at siemens.com
Wed Mar 14 17:00:57 CET 2007
Dear GetDP users:
I just started learning about magnetism. I have a couple of basic
questions that I am not able to figure out. It will be appreciated if
someone here can shed some light on this.
I have a permanent magnet - no electric current in the domain. I would
like to calculate the magnetic flux density.
I have found a 3D code posted by Jasper in 2006. The questions are:
1. The governing equation for magnetostatics filed is:
Curl ( nu * Curl A) = J, where A is vector potential and J is electric
current density.
Now, since there is no current, I will think that J is zero.
2. In the Formulation of getdp code (2D Magnetostatics example on getdp
wiki),
it showed:
Equation {
Galerkin { [nu[] * Dof{ Curl a}, {Curl a}]; In Domain;
Jacobian JVol; Integration I1; }
Galerkin { [hc[], {Curl a}; In Domain_M; Jacobian
JVol; Integration I1;}
}
How does {hc[], {Curl a}} come into the equation? I believe that hc is
Coercitivity of the magnet?
Thanks in advance for your reply!
Best Regards,
Pei
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