Dynamic modeling of levitation of a superconducting bulk by coupled H-magnetic field and arbitrary Lagrangian–Eulerian formulations. (22nd October 2018)

• Record Type: Journal Article
• Authors: Grilli, Francesco; Morandi, Antonio; Silvestri, Federica De; Brambilla, Roberto
• Is Part Of: Superconductor science & technology. Volume 31:Number 12(2018:Dec.)
• Publication Date: 2018-10-22
• Subjects: magnetic levitation -- finite-element method -- H-formulation -- moving mesh; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/aae426
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: Intrinsically stable magnetic levitation between superconductors and permanent magnets can be exploited in a variety of applications of great technical interest in the field of transportation (rail transportation), energy (flywheels) and industry. In this contribution, we present a new model for the calculation of levitation forces between superconducting bulks and permanent magnets, based on the H -formulation of Maxwell's equations coupled with an arbitrary Lagrangian–Eulerian formulation. The model uses a moving mesh that adapts at each time step based on the time-change of the distance between a superconductor bulk and a permanent magnet. The model is validated against a fixed mesh model (recently in turn validated against experiments) that uses an analytical approach for calculating the magnetic field generated by the moving permanent magnet. It is then used to analyze the magnetic field dynamics both in field-cooled and zero-field-cooled conditions and successively used to test different configurations of permanent magnets and to compare them in terms of levitation forces. The ease of implementation of this model and its flexibility in handling different geometries, material properties, and application scenarios makes it an attractive tool for the analysis and optimization of magnetic levitation-based applications.