标题： 使用体积流体（VOF）方法对自由溢流坝汽蚀动力学的数值分析 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，特别是溢洪道陡坡上的两相流，可以使用三维数值模型实现高精度。 本研究通过在Flow-3D中进行的数值模拟，调查了阿赫恰大坝工作泄洪道上真空生成和空化现象的潜力。 分析重点是两个特定的流量，4400和1065立方米每秒，这些流量由实验数据确定。 采用体积流体（VOF）方法来准确计算自由表面流。 在4400立方米每秒的排水率下，模拟结果表明，在关键位置，包括溢流曲线和陡坡通道的角度过渡处，空化可能性很高。 这些区域需要特定的缓解措施以防止空化引起的损坏。 相反，在较低的1065立方米每秒流量下，由于流速降低以及水流未从床面分离，空化的风险很小。 数值结果与实证观察高度一致，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.