首页|Surface tension effects on Rayleigh-Taylor instability in nonideal fluids:A multiple-relaxation-time discrete Boltzmann study

Surface tension effects on Rayleigh-Taylor instability in nonideal fluids:A multiple-relaxation-time discrete Boltzmann study

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Surface tension effects on Rayleigh-Taylor instability in nonideal fluids:A multiple-relaxation-time discrete Boltzmann study
A multi-relaxation-time discrete Boltzmann model for compressible non-ideal gases with adjustable specific heat ratio is pro-posed,and the impact of surface tension on Rayleigh-Taylor instability(RTI)is investigated from two perspectives:macroscopic and non-equilibrium characteristics.In terms of physical cognition,(1)it is found that there are two critical surface tensions:the upper critical value and the lower critical value.When the surface tension is below the lower critical value,the RTI evolution aligns qualitatively with the case without surface tension.As the surface tension coefficient increases,the inhibitory effect on RTI evolution gradually strengthens.When the surface tension is greater than the upper critical value,the disturbance interface tends to be stable after multiple oscillations.When the surface tension is in between,the perturbation interface first reverses,or even multiple reverses,and then destabilizes and develops rapidly.(2)A series of new kinetic behavior characteristics are given,and it is found that some behavior characteristics have important reference value for the control of system behavior.For example,the first peak in the growth rate of the global average non-organized momentum flux strength D2 corresponds to the onset of the regular nonlinear stage.The peak in the growth rate of the global average non-organized energy flux strength D3,1 marks the beginning of the re-acceleration stage.The onset of the uniform acceleration stage in the growth rate of the global average non-equilibrium strength DTNE corresponds to the system transitioning into the regular nonlinear stage,while its terminal point(also the peak)corresponds to the system entering the re-acceleration stage.These insights enhance understanding of RTI mechanisms in complex fluids kinetically.

statistical mechanics of classical fluidsflow instabilitieskinetic theory

Feng Chen、Aiguo Xu、Jiahui Song、Yanbiao Gan、Yudong Zhang、Ning Guan

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School of Aeronautics,Shan Dong Jiaotong University,Jinan 250357,China

National Key Laboratory of Computational Physics,Institute of Applied Physics and Computational Mathematics,Beijing 100088,China

HEDPS,Center for Applied Physics and Technology,and College of Engineering,Peking University,Beijing 100871,China

State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China

National Key Laboratory of Shock Wave and Detonation Physics,Mianyang 621999,China

School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China

Hebei Key Laboratory of Trans-Media Aerial Underwater Vehicle,North China Institute of Aerospace Engineering,Langfang 065000,China

School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China

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statistical mechanics of classical fluids flow instabilities kinetic theory

2024

10.1007/s11433-024-2490-x

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(12)