Evolution of unsupported shocks in a two-dimensional Yukawa solid

Molecular dynamical simulations are performed to investigate the evolution of unsupported shocks in a two-dimensional Yukawa solid. When a boundary of the solid moves uniformly inward, a compressional shock is generated with a propagating front. An unsupported shock forms if the moving boundary sudd...

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Bibliographic Details
Published in:Physics of plasmas 2021-10, Vol.28 (10), p.103703
Main Authors: Sun, Tianyue, Murillo, Michael S., Feng, Yan
Format: Article
Language:English
Subjects:
Compressibility
Evolution
Plasma physics
Rarefaction
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Summary:Molecular dynamical simulations are performed to investigate the evolution of unsupported shocks in a two-dimensional Yukawa solid. When a boundary of the solid moves uniformly inward, a compressional shock is generated with a propagating front. An unsupported shock forms if the moving boundary suddenly stops, and a rarefaction wave (RW) is generated near this boundary. The original shock front propagates more slowly than the head of the new RW; as a result, the shock front is eventually overtaken by the RW and a new front appears. It is found that the speed of this new front can be expressed as the average of the previous shock front speed and the longitudinal sound speed, the latter of which has a transition depending on the initial compressional speed of the moving boundary. It appears that this transition of the new shock front speed probably can be attributed to change of the compressibility properties.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0064914