A comparison of velocity skin effect modeling with 2-D transient and 3-D quasi-transient finite element methods

Nail Tosun (Corresponding author), Doga Ceylan, Hakan Polat, Ozan Keysan

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The analysis of the velocity skin effect (VSE) in electromagnetic launchers (EMLs) requires a 3-D transient finite element method, unlike magnetic skin and proximity effects. However, VSE is dominant at high speeds, and this creates convergence problems when moving or deformed mesh physics is used in a transient FEM in the 3-D analysis. Commercial finite element software cannot solve the electromagnetic aspects of such a high-speed application with a transient solver in 3-D. Although 2-D approximations can be used, such an approximation overestimates VSE resistance due to geometry simplifications. In this study, we proposed a novel quasi-transient 3-D FEM model where the air-armature region’s conductivity is varied to emulate the high-speed motion of the armature. Results show that the 2-D approximation overestimates the VSE resistance by almost 40%. The proposed VSE model has been included in the EML model, and simulation results are compared for experimental results with different EMLs, EMFY-1, and EMFY-2 and showed good agreement.
Original languageEnglish
Article number9387772
JournalIEEE Transactions on Plasma Science
VolumeXX
Issue numberXX
DOIs
Publication statusE-pub ahead of print - 26 Mar 2021

Keywords

  • Electromagnetic launchers (EMLs)
  • finite element method (FEM)
  • transient analysis
  • velocity skin effect (VSE).

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