Influence of the tangential velocity on the compressible Kelvin–Helmholtz instability with nonequilibrium effects

作     者：Yaofeng Li Huilin Lai Chuandong Lin Demei Li Yaofeng Li;Huilin Lai;Chuandong Lin;Demei Li

作者机构：College of Mathematics and StatisticsFJKLMAACenter for Applied Mathematics of Fujian Province(FJNU)Fujian Normal UniversityFuzhou 350117China Sino-French Institute of Nuclear Engineering and TechnologySun Yat-sen UniversityZhuhai 519082China 

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

年 卷 期：2022年第17卷第6期

页      面：125-141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：supported by the National Natural Science Foundation of China(Grant Nos.51806116 and 11875001) the Natural Science Foundation of Fujian Provinces(Grant Nos.2021J01652 and 2021J01655) 

主　　题：Kelvin-Helmholtz instability thermodynamic nonequilibrium effect viscous stress discrete Boltzmann method 

摘      要：Kelvin–Helmholtz(KH)instability is a fundamental fluid instability that widely exists in nature and *** better understand the dynamic process of the KH instability,the influence of the tangential velocity on the compressible KH instability is investigated by using the discrete Boltzmann method based on the nonequilibrium statistical *** hydrodynamic and thermodynamic nonequilibrium(TNE)effects are probed and *** is found that,on the whole,the global density gradients,the TNE strength and area firstly increase and decrease *** the global density gradient and heat flux intensity in the vertical direction are almost constant in the initial stage before a vortex ***,with the increase of the tangential velocity,the KH instability evolves faster,hence the global density gradients,the TNE strength and area increase in the initial stage and achieve their peak earlier,and their maxima are higher for a larger tangential ***,there are several competitive mechanisms in the evolution of the KH instability.(i)The physical gradients increase and the TNE effects are strengthened as the interface is *** local physical gradients decrease and the local TNE intensity is weakened on account of the dissipation and/or diffusion.(ii)The global heat flux intensity is promoted when the physical gradients *** the contact area expands,the heat exchange is enhanced and the global heat flux intensity increases.(iii)The global TNE intensity reduces with the decreasing of physical gradients and increase with the increasing of TNE area.(iv)The nonequilibrium area increases as the fluid interface is elongated and is widened because of the dissipation and/or diffusion.