Numerical investigation of initial condition effects on Rayleigh-Taylor instability with acceleration reversals
Numerical investigation of initial condition effects on Rayleigh-Taylor instability with acceleration reversals
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DOI：
10.1103/physreve.94.053114
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发表时间：
2016-11-18
影响因子：
2.4
通讯作者：
Lawrie, Andrew G. W.
中科院分区：
文献类型：
--
作者：
Aslangil, Denis;Banerjee, Arindam;Lawrie, Andrew G. W.
使用隐式大涡模拟 (ILES) 技术通过计算探讨了初始条件对经历非均匀加速的混相不可压缩斜压驱动的瑞利-泰勒不稳定性的影响。我们考虑加速方向多次反转期间演化的特殊情况，其中流动交替静态稳定或不稳定。在不稳定阶段，流动由势能的斜压释放驱动，而在稳定阶段，通过波状机制进行能量交换来对抗密度分层。这些动态是根本不同的；在这里，我们跟踪体积平均湍流统计的演变，当流动由于加速度反转而在动态状态之间交替时，这些统计对初始条件的光谱功率和带宽的分布变化最敏感。
The influence of initial conditions on miscible incompressible baroclinically driven Rayleigh-Taylor instability undergoing nonuniform acceleration is explored computationally using an implicit large eddy simulation (ILES) technique. We consider the particular case of evolution during multiple reversals of acceleration direction, where the flow is alternately statically stable or unstable. In the unstable phase, the flow is driven by the baroclinic release of potential energy, whereas in the stable phase, work is done against the density stratification with the energy exchange taking place by wavelike mechanisms. These dynamics are fundamentally different; here, we track the evolution of volume-averaged turbulent statistics that are most sensitive to changes in the distribution of spectral power and bandwidth of the initial conditions as the flow alternates between dynamical regimes due to acceleration reversal.