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Published December 2014 | Published
Journal Article Open

Effects of seed magnetic fields on magnetohydrodynamic implosion structure and dynamics

Abstract

The effects of various seed magnetic fields on the dynamics of cylindrical and spherical implosions in ideal magnetohydrodynamics are investigated. Here, we present a fundamental investigation of this problem utilizing cylindrical and spherical Riemann problems under three seed field configurations to initialize the implosions. The resulting flows are simulated numerically, revealing rich flow structures, including multiple families of magnetohydrodynamic shocks and rarefactions that interact non-linearly. We fully characterize these flow structures, examine their axi- and spherisymmetry-breaking behaviour, and provide data on asymmetry evolution for different field strengths and driving pressures for each seed field configuration. We find that out of the configurations investigated, a seed field for which the implosion centre is a saddle point in at least one plane exhibits the least degree of asymmetry during implosion.

Additional Information

© 2014 AIP Publishing LLC. Received 25 July 2014; accepted 12 November 2014; published online 8 December 2014. This research was supported under Australian Research Councils Discovery Projects funding scheme (Project No. DP120102378). W. Mostert is supported by an Australian Post-graduate Award. Dr Wheatley is the recipient of an Australian Research Council Discovery Early Career Researcher Award (Project No. DE120102942). Professor Samtaney is partially supported by a KAUST Base Research Award. We would also like to thank Myall Hingee for his useful contribution to the research.

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