[Getdp] Eddy Current Testing in getDP

[Mengelkamp Judith TU Ilmenau]

Dear getDP-users,

I am currently struggling with simulating Eddy Current Testing in getDP. I have implemented a simplified model (one turn as an excitation coil with sinusoidal source current and a metal sheet as test specimen). I use an A-V-formulation (magnetic vector potential and electric scalar potential). I use a theta-time scheme for the time-varying source current in the coil. My current .geo and .pro-files are in the appendix. The magnetic field of the coil is calculated correctly in time, however the eddy current induced in the conductor result into zero and I don't have an explanation for that. Further, the magnetic vector potential doesn't change in time and the electric potential is not defined in all volume elements of the air. I would be very pleased if someone could help me with these issues. Here are some remarks concerning my implementation:

-          The fifth integral term in the Formulation constraints the gradient of the electric potential at the surface of the conductor. Because I didn't know how to implement this as a constraint, I put this term in the formulation and use a user-defined function for the normal component. Is this ok?

-          I set the electric potential in a randomly chosen point to zero to ensure the solution is unique.

-          I also noticed that the magnetic field in the conductor is relatively high and does not change in time.

Because I am quite new to getDP...is there any paper or similar that describes finite element calculations with eddy currents?

Thank you very much in advance,
Judith.

--------------------------------------------
M.Sc. Judith Mengelkamp

Technische Universität Ilmenau
Institut für Biomedizinische Technik und Informatik (Institute for Biomedical Engineering and Informatics)
Fachgebiet Biomedizinische Technik (Biomedical Engineering Group)

Phone: +49 3677 69-1958
Fax:       +49 3677 69-1311
e-mail:  judith.mengelkamp at tu-ilmenau.de

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