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Abstract: Molecular Dynamic MD approach is applied to study the convergingcylindrical shock waves in a dense Lennard-Jones LJ fluid. MD method is basedon tracking of the atom motions and hence it has an fundamental advantages overhydrodynamic methods which assumes shocks as a structureless discontinuity andrequires an equation of state. Due to the small thickness of shock fronts inliquid the two million particles is enough to simulate propagation of acylindrical shocks in close detail.We investigate stability of converging shocks with different perturbationmodes and its mixture. It was shown that in a case of relatively large initialripples the Mach stems are formed. Supersonic jets generated by interaction ofreflected shocks in downstream flow are observed. We also study theRichtmyer-Meshkov RM instability of an interface between two Lennard-Jonesliquids of different mass densities. Surprisingly, mode 3 ripples grow veryslow in comparison with higher mode numbers and growth rate of a higher modedecay slower.



Autor: V. Zhakhovskii, K. Nishihara, M. Abe

Fuente: https://arxiv.org/



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