Stratified inclined duct: direct numerical simulations
Stratified inclined duct: direct numerical simulations
复制标题
分层倾斜风管：直接数值模拟
DOI：
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发表时间：
2023
影响因子：
3.7
通讯作者：
P. Linden
中科院分区：
文献类型：
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作者：
Lu Zhu;Amir Atoufi;A. Lefauve;John R. Taylor;R. Kerswell;S. Dalziel;G. Lawrence;P. Linden
摘要分层倾斜管道（SID）实验是在一个长的倾斜矩形管道中进行的零净体积交换流动，它允许研究具有持续内强迫的真实分层剪切流动。我们提出了SID的第一个三维直接数值模拟（DNS），以探索由Meyer和林登（J. Fluid Mech.，第753卷，2014年，pp. 242-253）。我们开发了一个数值设置，忠实地再现实验，并维持流任意长的时间，以最小的计算成本。我们恢复四个定性的流态实验发现在参数空间的相同区域：层流，波，间歇性湍流和充分发展的湍流。我们发现DNS和实验之间的定性和定量的协议，并强调DNS的附加值，以补充实验诊断和增加我们的理解过渡到湍流，无论是时间（层流/湍流循环）和参数（作为管道的倾斜角和雷诺数增加）。这些结果表明，SID的数值研究-模拟和实验之间的更深层次的整合-有可能导致更好地理解分层湍流。
Abstract The stratified inclined duct (SID) experiment consists of a zero-net-volume exchange flow in a long tilted rectangular duct, which allows the study of realistic stratified shear flows with sustained internal forcing. We present the first three-dimensional direct numerical simulations (DNS) of SID to explore the transitions between increasingly turbulent flow regimes first described by Meyer & Linden (J. Fluid Mech., vol. 753, 2014, pp. 242–253). We develop a numerical set-up that faithfully reproduces the experiments and sustains the flow for arbitrarily long times at minimal computational cost. We recover the four qualitative flow regimes found experimentally in the same regions of parameter space: laminar flow, waves, intermittent turbulence and fully developed turbulence. We find good qualitative and quantitative agreement between DNS and experiments and highlight the added value of DNS to complement experimental diagnostics and increase our understanding of the transition to turbulence, both temporally (laminar/turbulent cycles) and parametrically (as the tilt angle of the duct and the Reynolds number are increased). These results demonstrate that numerical studies of SID – and deeper integration between simulations and experiments – have the potential to lead to a better understanding of stratified turbulence.
湍流分层混合中的开放性问题：我们是否知道我们不知道的东西？
影响因子：
2.7
作者：
Caulfield C
通讯作者：
Caulfield C