Tensor Temperature and Shockwave Stability in a Strong Two-Dimensional Shockwave

Details Tensor Temperature and Shockwave Stability in a Strong Two-Dimensional Shockwave Tensor Temperature and Shockwave Stability in a Strong Two-Dimensional Shockwave

2009-05-12

arxiv.org/abs/0905.1913v2

Physics

Condensed Matter

Statistical Mechanics

15 pages with 8 figures, after review at Physical Review E

Scientific paper

The anisotropy of temperature is studied here in a strong two-dimensional shockwave, simulated with conventional molecular dynamics. Several forms of the kinetic temperature are considered, corresponding to different choices for the local instantaneous stream velocity. A local particle-based definition omitting any "self" contribution to the stream velocity gives the best results. The configurational temperature is not useful for this shockwave problem. Configurational temperature is subject to a shear instability and can give local negative temperatures in the vicinity of the shock front. The decay of sinusoidal shockfront perturbations shows that strong two-dimensional planar shockwaves are stable to such perturbations.

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