Transient heating effects in electromagnetic launchers with complex geometries: A 3D hybrid FE/BE analysis
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing, 210094, China
2 Nanoscale Technology and Engineering Laboratory, Department of Mechanical Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
A time-stepping finite-element (FE) and boundary-element (BE) coupling method was implemented to include 3D transient eddy current under electromagnetic heating effects in electromagnetic launchers. Lagrangian formulations were used to model electromagnetic and thermal diffusive processes with moving conductors. The finite-element formulation was employed for the general diffusion equation in a bounded conductor region including rail and armature; while, in the exterior region, the boundary element method was developed for Laplace's equation. The coupled boundary was employed directly on the surface of conductors and no special treatment on boundary was required. The electromagnetic and temperature fields were coupled through iterative calculations. This method results in considerable time saving in modeling as it eliminates the surrounding air region.
© EDP Sciences, Springer-Verlag, 2009