Title :
Numerical problems in 3D FEM simulation Of harmonic magnetic fields
Author :
Dumitru, Corneliu Octavian ; Magda, Enescu Florentina ; Cristian, Castravete Stefan
Author_Institution :
Dept. Electron., Comput. & Electr. Eng., Univ. Pitesti, Pitesti, Romania
Abstract :
This paper deals with some numerical instabilities that could occur in the 3D time harmonic magnetic field FEM analysis. Because the electric conductivity σ of the air is 0 the ratio between the skin depths in the air and in the non ferromagnetic or ferromagnetic materials has a high value that affects the accuracy of the results. In order to attenuate this problem an artificial value of the electric conductivity σ of the air will be assigned. The evaluation of the artificial value was performed in two cases: with the gauge condition on and off. This approach was applied to the computation of the effectiveness of a spherical shield, made of steel and copper.
Keywords :
air; electrical conductivity; finite element analysis; magnetic fields; 3D time harmonic magnetic field FEM analysis; air; electric conductivity; nonferromagnetic materials; numerical instabilities; spherical shield; Conductivity; Copper; Finite element analysis; Magnetic noise; Magnetic shielding; Three-dimensional displays; Vectors; Kaden model; artificial electric conductivity for air; finite element method; gauge condition;
Conference_Titel :
Electronics, Computers and Artificial Intelligence (ECAI), 2013 International Conference on
Conference_Location :
Pitesti
Print_ISBN :
978-1-4673-4935-2
DOI :
10.1109/ECAI.2013.6636193
