Numerical Impact of Using Different E-J Relationships for 3-D Simulations of AC Losses in MgB2 Superconducting Wires

Guillaume Escamez, Frederic Sirois, Arnaud Badel, Gerard Meunier, Brahim Ramdane, Pascal Tixador

研究成果: Article査読

7 被引用数 (Scopus)

抄録

AC losses in superconductors are generated every time a time-varying current/field is present. Engineers must be able to predict these losses as accurately as possible during the design phase of power applications. The electrodynamics of superconductors can be formulated as a nonlinear eddy current problem in which the resistivity of the superconducting region is a highly nonlinear function of the current density. In 3-D finite-element simulations, it leads to time-consuming simulations and convergence issues. In this paper, we compare two different E - J constitutive equations, namely: 1) power law model and 2) the percolation model (PM), programmed within both the H - \phi and T - \phi formulations. Based on the 3-D case of a three-filament twisted superconducting wire, the numerical performance of all these formulations/material models is compared in terms of accuracy, computation times, number of time steps, and number of Newton iterations for different relaxation methods. It is shown that the combination of the T - \phi formulation and the E - J PM works fine and should be further developed, as it seems to constitute the best modeling option from both a numerical and physical point of view.

本文言語English
論文番号7402904
ジャーナルIEEE Transactions on Magnetics
52
3
DOI
出版ステータスPublished - 2016 3月
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 電子工学および電気工学

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