Nonequilibrium and morphological characterizations of Kelvin-Helmholtz instability in compressible flows  

作　　者：Yan-Biao Gan Ai-Guo Xu Guang-Cai Zhang Chuan-Dong Lin Hui-Lin Lai Zhi-Peng Liu 

机构地区：[1]North China Institute of Aerospace Engineering, Langfang 065000, China [2]College of Mathematics and Informatics & FJKLMAA, Fujian Normal University, Fuzhou 350007, China [3]Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, P. O. Box 8009-26, Beijing 100088, China [4]State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China [5]Center for Applied Physics and Technology, MOE Key Center for High Energy Density Physics Simulations, College of Engineering, Peking University, Beijing 100871, China [6]Center for Combustion Energy, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China [7]Department of Physics, School of Science, Tianjin Chengjian University, Tianjin 300384, China

出　　处：《Frontiers of physics》2019年第4期83-99,共17页物理学前沿（英文版）

基　　金：Y. G.,C.L., H. L. and Z. L. acknowledge the support from the National Natural Science Foundation of China (Grant Nos.11875001,51806116, and 11602162);Natural Science Foundation of Hebei Province (Grants Nos. A2017409014 and 2018J01654);Natural Science Foundations of Hebei Educational Commission (Grant No.ZD2017001);A. X. and G.Z.acknowledge the support from the National Natural Science Foundation of China (Grant No. 11772064);CAEP Foundation (Grant No. CX2019033);Science Challenge Project (Grant No.JCKY2016212A501);the opening project of State Key Laboratory of Explosion Science and Technology (Beijing Institute of Technology, Grant No. KFJJ19-01M).

摘　　要：We investigate the effects of viscosity and heat conduction on the onset and growth of Kelvin-Helmholtz instability (KHI) via an efficient discrete Boltzmann model.Technically,two effective approaches are presented to quantitatively analyze and understand the configurations and kinetic processes.One is to determine the thickness of mixing layers through tracking the distributions and evolutions of the thermodynamic nonequilibrium (TNE) measures;the other is to evaluate the growth rate of KHI from the slopes of morphological functionals.Physically,it is found that the time histories of width of mixing layer,TNE intensity,and boundary length show high correlation and attain their maxima simultaneously.The viscosity effects are twofold,stabilize the KHI,and enhance both the local and global TNE intensities.Contrary to the monotonically inhibiting effects of viscosity,the heat conduction effects firstly refrain then enhance the evolution afterwards.The physical reasons are analyzed and presented.

关 键 词：KELVIN-HELMHOLTZ INSTABILITY discrete BOLTZMANN method THERMODYNAMIC NONEQUILIBRIUM effect MORPHOLOGICAL characterization 

分 类 号：O4[理学—物理]