论文标题
内部船舶空气腔的关闭区域的流动动力学
Flow dynamics in the closure region of an internal ship air cavity
论文作者
论文摘要
这项工作致力于提供内部船舶空气腔封闭区域的流动动态的详细说明。考虑了几何简单的多波测试腔，并使用大型模拟与代数体积的流体界面捕获方法进行模拟。结果表明，闭合区域的流量高度不稳定和湍流。由于流动停滞在空腔的海滩壁上，因此确定的主要原因是发生的压力梯度。压力梯度导致空气水界面的平均位置的陡峭倾斜度，从而导致流动与之分开并形成再循环区域，在该区域中混合了空气和水。分离的流动变得湍流，这进一步促进了空气的混合和夹带。气泡群周期性泄漏。在闭合区域的上游，使用基于线性流程理论的现有近似值，发现波的相位和长度可以很好地预测。但是，对于波浪幅度的相应预测，一致性更糟，估计值低估了模拟结果。
This work is dedicated to providing a detailed account of the flow dynamics in the closure region of an internal ship air cavity. A geometrically simple multiwave test cavity is considered, and a simulation of the flow is conducted using large-eddy simulation coupled with an algebraic Volume of Fluid interface capturing method. Results reveal that the flow in the closure region is highly unsteady and turbulent. The main cause of this is established to be the pressure gradient occurring due to the stagnation of the flow on the beach wall of the cavity. The pressure gradient leads to a steep incline in the mean location of the air-water interface, which, in turn, leads to the flow separating from it and forming a recirculation zone, in which air and water are mixed. The separated flow becomes turbulent, which further facilitates the mixing and entrainment of air. Swarms of air bubbles leak periodically. Upstream of the closure region, the phase and length of the wave are found to be well-predicted using existing approximations based on linear flow theory. However, for the corresponding prediction of the amplitude of the wave the agreement is worse, with the estimates under-predicting the simulation results.
