Kinetics of Rayleigh-Taylor instability in van der Waals fluid:the influence of compressibility  

作　　者：Jie Chen Aiguo Xu Yudong Zhang Dawei Chen Zhihua Chen 陈杰;许爱国;张玉东;陈大伟;陈志华

机构地区：[1]National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China [2]National Key Laboratory of Computational Physics,Institute of Applied Physics and Computational Mathematics,P.O.Box 8009-26,Beijing 100088,China [3]State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China [4]HEDPS,Center for Applied Physics and Technology,and College of Engineering,Peking University,Beijing 100871,China [5]National Key Laboratory of Shock Wave and Detonation Physics,Mianyang 621999,China [6]School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Frontiers of physics》2025年第1期269-297,共29页物理学前沿(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12172061,12102397,and 12101064);the Opening Project of State Key Laboratory of Explosion Science and Safety Protection(Beijing Institute of Technology)(Grant No.KFJJ23-02M);the Foundation of National Key Laboratory of Shock Wave and Detonation Physics(Grant No.JCKYS2023212003);the 2023 Computational Physics Key Laboratory Youth Fund Sponsored Project(Grant No.6241A05QN23001).

摘　　要：Early studies on Rayleigh−Taylor instability(RTI)primarily relied on the Navier−Stokes(NS)model.As research progresses,it becomes increasingly evident that the kinetic information that the NS model failed to capture is of great value for identifying and even controlling the RTI process;simultaneously,the lack of analysis techniques for complex physical fields results in a significant waste of data information.In addition,early RTI studies mainly focused on the incompressible case and the weakly compressible case.In the case of strong compressibility,the density of the fluid from the upper layer(originally heavy fluid)may become smaller than that of the surrounding(originally light)fluid,thus invalidating the early method of distinguishing light and heavy fluids based on density.In this paper,tracer particles are incorporated into a single-fluid discrete Boltzmann method(DBM)model that considers the van der Waals potential.By using tracer particles to label the matter-particle sources,a careful study of the matter-mixing and energy-mixing processes of the RTI evolution is realized in the single-fluid framework.The effects of compressibility on the evolution of RTI are examined mainly through the analysis of bubble and spike velocities,the ratio of area occupied by heavy fluid,and various entropy generation rates of the system.It is demonstrated that:(i)compressibility has a suppressive effect on the spike velocity,and this suppressive impact diminishes as the Atwood number(At)increases.The influence of compressibility on bubble velocity shows a staged behavior with increasing.(ii)The impact of compressibility on the entropy production rate associated with the heat flow(S_(NOEF))is related to the stages of RTI evolution.Moreover,this staged impact of compressibility on S_(NOEF)varies with At.Compressibility exhibits an inhibitory effect on the entropy production rate associated with viscous stresses(S_(NOEF)).(iii)By incorporating the morphological parameter of the proportion of area occupied by heavy fluid(A_(

关 键 词：discrete Boltzmann method Rayleigh-Taylor instability compressibility effect tracer particles 

分 类 号：P35[天文地球—空间物理学]