Nonequilibrium kinetics effects in Richtmyer–Meshkov instability and reshock processes  

作　　者：Yiming Shan Aiguo Xu Lifeng Wang Yudong Zhang 

机构地区：[1]National Key Laboratory of Computational Physics,Institute of Applied Physics and Computational Mathematics,Beijing 100088,China [2]National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China [3]Center for Applied Physics and Technology,MOE Key Center for High Energy Density Physics Simulations,College of Engineering,Peking University,Beijing 100871,China [4]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China [5]School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Communications in Theoretical Physics》2023年第11期99-114,共16页理论物理通讯（英文版）

基　　金：supported by the National Natural Science Foundation of China(under Grant Nos.12172061,11875001,11575033,and 11975053);the opening project of the State Key Laboratory of Explosion Science and Technology(Beijing Institute of Technology)(under Grant No.KFJJ23-02M);Foundation of National Key Laboratory of Shock Wave and Detonation Physics;the Foundation of National Key Laboratory of Computational Physics

摘　　要：Kinetic effects in the inertial confinement fusion ignition process are far from clear.In this work,we study the Richtmyer-Meshkov instability and reshock processes by using a two-fluid discrete Boltzmann method.The work begins by interpreting the experiment conducted by Collins and Jacobs(2002,J.Fluid Mech.464,113-136).It shows that the shock wave causes substances in close proximity to the substance interface to deviate more significantly from their thermodynamic equilibrium state.The thermodynamic non-equilibrium(TNE)quantities exhibit complex but inspiring kinetic effects in the shock process and behind the shock front.The kinetic effects are detected by two sets of TNE quantities.The first set includes∣Δ_(2)^(*)∣,∣Δ_(3,1)^(*),∣Δ_(3)^(*)∣,and∣Δ_(4,2)^(*)∣,which correspond to the intensities of the non-organized momentum Flux(NOMF),Non-Organized Energy Flux(NOEF),the flux of NOMF and the flux of NOEF.All four TNE measures abruptly increase in the shock process.The second set of TNE quantities includes■_(NOMF),■_(NOEF)and■_(sum),which denote the entropy production rates due to NOMF,NOEF and their summation,respectively.The mixing zone is the primary contributor to■_(NOEF),while the flow field region outside of the mixing zone is the primary contributor to■_(NOMF).Additionally,each substance exhibits different behaviors in terms of entropy production rate,and the lighter fluid has a higher entropy production rate than the heavier fluid.

关 键 词：Richtmyer-Meshkov instability discrete Boltzmann method nonequilibrium kinetics effects 

分 类 号：TL61[核科学技术—核技术及应用] TL334