Electrodynamics

Publications

Isentropic Compression in a Strip Line, Numerical Simulations and Comparison with GEPI Shot 268

A. Lefrançois, P.L. 'Eplattenier, M. Burger

This paper validates a new electromagnetism module in LS-DYNA by simulating an isentropic compression experiment of a copper strip line. The coupled mechanical-thermal-electromagnetic simulations are compared against experimental data from the GEPI facility's shot 268. Results for the Free Surface Velocity show good agreement with experiments after accounting for measurement uncertainty in the input current.

Isentropic Compression up to 200 KBars for LX 04,

A. Lefrançois, P.L. 'Eplattenier, M. Burger

This paper presents a comparison between numerical simulations and experimental data for the isentropic compression of the high explosive LX-04. The simulations were performed using a new electromagnetism module in LS-DYNA to test its coupled mechanical-thermal-electromagnetic capabilities. The results for velocity and pressure are benchmarked against data from Z accelerator shot 1067, showing good accuracy.

Copper Tube Compression in Z-Current Geometry

A. Lefrançois, P.L. 'Eplattenier, M. Burger

This paper validates a new electromagnetism module in LS-DYNA by simulating the high-strain-rate compression of a copper tube in a Z-current geometry. The simulations, which couple mechanical, thermal, and electromagnetic effects, are compared against experimental data from the Cyclope facility. The study investigates the influence of various model parameters, like the electromagnetic time step and current diffusion, on the accuracy of the results.

Discrete Differential Forms: A Novel Methodology for Robust Computational Electromagnetics

This paper introduces Discrete Differential Forms (DDF), a new methodology for solving electromagnetic problems on unstructured grids that overcomes the instability of previous numerical methods. Based on differential geometry, the approach uses different types of basis functions (p-forms) for different physical quantities, ensuring stability and conservation. The research resulted in the FEMSTER C++ library, which implements these higher-order methods and is validated on various applications

A Electromagnetism Module in LS-DYNA for Coupled Mechanical-Thermal-Electromagnetic Simulations

This paper introduces a new electromagnetism module in the LS-DYNA software for coupled mechanical-thermal-electromagnetic simulations, with a primary focus on Electromagnetic Metal Forming (EMF). The module's capabilities are demonstrated through its successful validation against a ring expansion experiment and a simulation of sheet metal forming. The solver uses a combined Finite Element and Boundary Element Method to compute electromagnetic forces and Joule heating.