Rayleigh–Taylor mixing: direct numerical simulation and implicit large eddy simulation
Rayleigh–Taylor mixing: direct numerical simulation and implicit large eddy simulation
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DOI：
10.1088/1402-4896/aa732b
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发表时间：
2017-06
期刊：
影响因子：
2.9
通讯作者：
D. Youngs
中科院分区：
文献类型：
--
作者：
D. Youngs
总结了前人对瑞利-泰勒不稳定性引起的自相似混合的三维数值模拟研究。一系列的数值方法已被使用：直接数值模拟，隐式大涡模拟和大涡模拟与亚网格尺度耗散显式模型。然而，很少有论文对各种方法进行直接比较。本文的主要目的是比较直接数值模拟和隐式大涡模拟使用相同的计算框架。结果显示为四个测试情况：（i）单模瑞利-泰勒不稳定性，（ii）自相似瑞利-泰勒混合，（iii）三层混合和（iv）倾斜钻机瑞利-泰勒实验。结果发现，这两种方法给出了类似的结果，高雷诺数的行为。需要直接数值模拟来评估有限雷诺数的影响。
Previous research into three-dimensional numerical simulation of self-similar mixing due to Rayleigh–Taylor instability is summarized. A range of numerical approaches has been used: direct numerical simulation, implicit large eddy simulation and large eddy simulation with an explicit model for sub-grid-scale dissipation. However, few papers have made direct comparisons between the various approaches. The main purpose of the current paper is to give comparisons of direct numerical simulations and implicit large eddy simulations using the same computational framework. Results are shown for four test cases: (i) single-mode Rayleigh–Taylor instability, (ii) self-similar Rayleigh–Taylor mixing, (iii) three-layer mixing and (iv) a tilted-rig Rayleigh–Taylor experiment. It is found that both approaches give similar results for the high-Reynolds number behavior. Direct numerical simulation is needed to assess the influence of finite Reynolds number.