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Effects of seed magnetic fields on magnetohydrodynamic implosion structure and dynamics

Mostert, W. and Wheatley, V. and Samtaney, R. and Pullin, D. I. (2014) Effects of seed magnetic fields on magnetohydrodynamic implosion structure and dynamics. Physics of Fluids, 26 (12). Art. No. 126102. ISSN 1070-6631. https://resolver.caltech.edu/CaltechAUTHORS:20150130-091306770

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.4902432DOIArticle
http://scitation.aip.org/content/aip/journal/pof2/26/12/10.1063/1.4902432PublisherArticle
ORCID:
AuthorORCID
Samtaney, R.0000-0002-4702-6473
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.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Australian Research CouncilDP120102378
Australian Post-graduate AwardUNSPECIFIED
Australian Research CouncilDE120102942
King Abdullah University of Science and Technology (KAUST)UNSPECIFIED
Issue or Number:12
Record Number:CaltechAUTHORS:20150130-091306770
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150130-091306770
Official Citation:Mostert, W., Wheatley, V., Samtaney, R., & Pullin, D. I. (2014). Effects of seed magnetic fields on magnetohydrodynamic implosion structure and dynamics. Physics of Fluids (1994-present), 26(12), -. doi: doi:http://dx.doi.org/10.1063/1.4902432
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54240
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:30 Jan 2015 21:47
Last Modified:03 Oct 2019 07:56

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