标题： 基于体积流体（VOF）方法的自由溢流坝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，特别是溢洪道泄槽中的两相流，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，探讨了阿赫恰大坝交通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。 体积流体（VOF）方法用于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，在溢流曲线和泄槽通道的角度过渡等关键位置发生空化的可能性很高。 这些区域需要采取特定的缓解措施以防止因空化引起的损坏。 相比之下，在较低的流量1065立方米每秒时，由于流速降低以及水流没有从底部分离，空化的风险很小。 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.