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首页> 外文期刊>Journal of Ship Research >Structures and Mechanisms of Air-Entraining Quasi-Steady Breaking Ship Waves
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Structures and Mechanisms of Air-Entraining Quasi-Steady Breaking Ship Waves

机译：引诱拟准稳固破船波的结构与机理

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The overall objective of this study is to develop a fundamental understanding of the quasi-steady breaking wave regions present in surface ship wakes. Our approach uses direct numerical simulation (DNS) and implicit large eddy simulation. Building on our previous efforts looking at three-dimensional canonical dry transom sterns, we focus on the flow structure, air entrainment, and incompressible highly variable density turbulent characteristics in the wake of a fully submerged lifting body. This article represents the first steps of this study. Here, we perform DNS of the wake of a fully submerged lifting body with constant forward speed. Depending on the geometry and flow conditions, the wake of the submerged body contains a quasi-steady breaking-wave region downstream of the body that entrains air. We show that the simulations accurately predict the force and vortex wake frequency of the submerged body. Lagrangian analysis of the wake shows a frequency of peak entrainment that alignswith the frequency of the vortex wake. Finally, we establish that the power law of the air cavity density spectrum during the peak entrainment periods is predicted by r(-10/3), consistent with experiments and theory.
机译：这项研究的总体目标是对水面舰船尾流中存在的准稳态破碎波区域有一个基本的了解。我们的方法使用直接数值模拟（DNS）和隐式大涡模拟。在我们先前对三维规范的干尾板船尾进行研究的基础上，我们将重点放在流动结构，空气夹带以及完全浸入水中的起重体之后的不可压缩的高度可变密度湍流特性上。本文代表了这项研究的第一步。在这里，我们以恒定的前进速度执行完全浸入水中的起重船尾的DNS。根据几何形状和流动条件，被淹没物体的尾流在其下游包含一个准稳定的破碎波区域，该区域会夹带空气。我们表明，仿真可以准确地预测被淹物体的力和涡流唤醒频率。尾波的拉格朗日分析显示，峰值夹带频率与涡流尾波的频率一致。最后，我们建立了由r（-10/3）预测峰夹带期间气穴密度谱的幂律，与实验和理论相一致的方法。

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