On coherent vortical structures in wave breaking
On coherent vortical structures in wave breaking
复制标题
波浪破碎中的相干涡旋结构
DOI：
10.1017/jfm.2022.674
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发表时间：
2022
影响因子：
3.7
通讯作者：
A. Iafrati
中科院分区：
文献类型：
--
作者：
Simone Di Giorgio;S. Pirozzoli;A. Iafrati
摘要本文用气液两相Navier-Stokes方程数值模拟了周期区域内自由表面波破碎产生的流动。求解器依赖于流体的体积的方法来考虑不同的阶段，和界面跟踪是通过使用基于定制的总变差减小限制器的新方案进行的。数值求解器被证明是由一个低的数值耗散的特点，由于使用的计划，保证能量守恒的离散形式。已经进行了二维和三维模拟，并在能量耗散，空气夹带，气泡破碎，统计和分布方面的分析。特别注意粘性耗散的机制进行了分析。为此目的，相干涡结构，如涡管和涡面，被确定，并强调在不同的雷诺数的涡面和管的不同行为。涡结构和能量耗散之间的相关性清楚地表明了它们在混合区和纯水域中的密切联系，其中相干结构作为向下运输的结果而传播。值得注意的是，它被发现，主要是由涡面的耗散，而涡管管主要的不稳定性。
Abstract The flow generated by the breaking of free-surface waves in a periodic domain is simulated numerically with a gas–liquid Navier–Stokes solver. The solver relies on the volume-of-fluid method to account for different phases, and the interface tracking is carried out by using novel schemes based on a tailored total-variation-diminishing limiter. The numerical solver is proved to be characterized by a low numerical dissipation, thanks to the use of a scheme that guarantees energy conservation in the discrete form. Both two- and three-dimensional simulations have been performed, and the analysis is presented in terms of energy dissipation, air entrainment, bubble fragmentation, statistics and distribution. Particular attention is paid to the analysis of the mechanisms of viscous dissipation. To this purpose, coherent vortical structures, such as vortex tubes and vortex sheets, are identified, and the different behaviours of the vortex sheets and tubes at various Reynolds numbers are highlighted. The correlation between vortical structures and energy dissipation demonstrates clearly their close link both in the mixing zone and in the pure water domain, where the coherent structures propagate as a consequence of the downward transport. Notably, it is found that the dissipation is identified primarily by the vortex sheets, whereas the vortex tubes govern mainly the intermittency.
影响因子：
3.7
作者：
Mostert, W.;Popinet, S.;Deike, L.
通讯作者：
Deike, L.