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

Frontiers of physics 2021年第5期16卷 199-210页

作者：陈璐赖惠林林传栋李德梅 College of Mathematics and Statistics FJKLMAACenter for Applied Mathematics of Fujian Province(FJNU)Fujian Normal UniversityFuzhou350117China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai519082China

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.

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

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