多模Rayleigh-Taylor不稳定性湍流混合增长的LBM模拟  

Lattice Boltzmann simulation of turbulent mixing growth of multi-mode Raleigh-Taylor instability

作　　者：程川 梁宏[2] 徐江荣[2] CHENG Chuan;LIANG Hong;XU Jiangrong(School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou Zhejiang 310018,China;Department of Physics,Hangzhou Dianzi University,Hangzhou Zhejiang 310018,China)

机构地区：[1]杭州电子科技大学机械工程学院,浙江杭州310018 [2]杭州电子科技大学物理系,浙江杭州310018

出　　处：《杭州电子科技大学学报（自然科学版）》2023年第6期1-6,共6页Journal of Hangzhou Dianzi University：Natural Sciences

基　　金：国家自然科学基金资助(批准号:11972142)。

摘　　要：利用介观格子Boltzmann方法对非混相多模Rayleigh-Taylor(RT)不稳定性进行了直接数值模拟,研究了Atwood数对多模RT不稳定性后期增长特性的影响,包括相界面动力学、气泡与尖钉演化的振幅和加速度系数。数值结果表明,Atwood数显著影响着多模RT不稳定性的增长,随着Atwood数的增大,尖钉与气泡的演化越加不对称,且尖钉的振幅以及加速度迅速增大,然而气泡的加速度系数基本维持在0.025±0.005,以及在不同Atwood数下数值模拟得到气泡与尖钉的加速度系数满足之前学者实验所测得的量化关系。Based on a multiphase lattice Boltzmann method,we perform a high-resolution numerical simulation of immiscible multi-mode Rayleigh-Taylor(RT)instability.The effects of wide Atwood numbers on the late-time growth of immiscible multi-mode RT instability are investigated,including interfacial dynamics,bubble/spike amplitudes,and acceleration coefficients.Atwood number significantly affects multi-mode RT instability,with the increase of Atwood number,the evolution of spikes and bubbles becomes more and more asymmetric,and the amplitude and acceleration of spikes increase rapidly,while the acceleration coefficient of the bubble is basically maintained at 0.025±0.005,and the numerical simulation shows that the acceleration coefficients of the bubble and the spike satisfy the quantitative relationship measured by the scholars before.

关 键 词：格子Boltzmann算法 多模Rayleigh-Taylor不稳定性 Atwood数 湍流混合 

分 类 号：TN401[电子电信—微电子学与固体电子学]