标题： 基于体积-of-流体（VOF）方法的自由溢洪道空化动力学数值分析 显示英文标题

标题： Numerical Analysis of Cavitation Dynamics on Free Ogee Spillways Using the Volume of Fluid (VOF) Method

摘要： 模拟复杂的水力条件，特别是泄洪道上的两相流，可以借助三维数值模型实现高精度的建模。本研究通过Flow-3D软件中的数值模拟，探讨了Aghchai大坝服务溢洪道产生真空和空化现象的可能性。 研究重点分析了两个特定流量，分别为4400立方米每秒和1065立方米每秒，这些流量根据实验数据确定。使用体积-of-流（VOF）方法来准确计算自由表面流动。 当流量为4400立方米每秒时，模拟结果显示，在关键位置（包括驼峰曲线和泄洪道通道的角度过渡处）存在较高的空化可能性。这些区域需要采取特定的缓解措施以防止因空化导致的损坏。 相比之下，在较低流量（1065立方米每秒）下，由于流速降低且床面无分离流，空化的风险极小。数值结果与经验观察高度一致，证明了该模拟方法在预测空化行为方面的可靠性。 显示英文摘要

摘要： Simulating complex hydraulic conditions, particularly two-phase flows over spillway chutes, can be achieved with high accuracy using three-dimensional numerical models. This study investigates the potential for vacuum generation and cavitation phenomena on the Aghchai Dam service spillway through numerical simulations conducted in Flow-3D. The analysis focuses on two specific flow rates, 4400 and 1065 cubic meters per second, as determined by experimental data. The Volume of Fluid (VOF) method is employed to accurately calculate the free surface flow. Simulation results at a discharge rate of 4400 cubic meters per second indicate a high likelihood of cavitation at critical locations, including the ogee curve and the angle transition in the chute channel. These areas require specific mitigation measures to prevent cavitation-induced damage. In contrast, at the lower flow rate of 1065 cubic meters per second, the risk of cavitation is minimal due to reduced flow velocity and the absence of flow separation from the bed. The numerical findings align closely with empirical observations, demonstrating the reliability of the simulation approach in predicting cavitation behavior.