Specific heat ratio effects of compressible Rayleigh—Taylor instability studied by discrete Boltzmann method

作     者：Lu Chen Huilin Lai Chuandong Lin Demei Li 陈璐;赖惠林;林传栋;李德梅

作者机构：College of Mathematics and StatisticsFJKLMAACenter for Applied Mathematics of Fujian Province(FJNU)Fujian Normal UniversityFuzhou350117China Sino-French Institute of Nuclear Engineering and TechnologySun Yat-sen UniversityZhuhai519082China 

出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)

年 卷 期：2021年第16卷第5期

页      面：199-210页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0704[理学-天文学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.51806116 and 11875001) the Natural Science Foundation of Fujian Province(Grant No.2018J01654) 

主　　题：discrete Boltzmann method Rayleigh-Taylor instability non-equilibrium effects specific heat ratio effects compressible fluid 

摘      要：Rayleigh-Taylor(RT)instability widely exists in nature and engineering *** to better understand the physical mechanism of RT instability is of great theoretical significance and practical *** present,abundant results of RT instability have been obtained by traditional macroscopic ***,research on the thermodynamic non-equilibrium(TNE)effects in the process of system evolution is relatively *** this paper,the discrete Boltzmann method based on non-equilibrium statistical physics is utilized to study the effects of the specific heat ratio on compressible RT *** evolution process of the compressible RT system with different specific heat ratios can be analyzed by the temperature gradient and the proportion of the non-equilibrium ***,as a result of the competition between the macroscopic magnitude gradient and the non-equilibrium region,the average TNE intensity first increases and then reduces,and it increases with the specific heat ratio decreasing;the specific heat ratio has the same effect on the global strength of the viscous stress ***,the moment when the total temperature gradient in y direction deviates from the fixed value can be regarded as a physical criterion for judging the formation of the vortex ***,under the competition between the temperature gradients and the contact area of the two fluids,the average intensity of the non-equilibrium quantity related to the heat flux shows diversity,and the influence of the specific heat ratio is also quite remarkable.