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复杂地形上的桥墩群附近,水流流态具有较强的三维特性,不宜使用经验公式、一维和二维数学模型来模拟,再考虑到物理模型的成本较高,可以使用VOF三维数学模型来模拟。为了增强模型对自由表面的捕捉能力,先用传统的VOF计算流体体积,再用Lagr angi an算法精确追踪自由表面。经过对实际工程的计算,结果表明Lagr angi an VOF能准确的模拟出桥墩群壅水高度及墩前涌浪的三维特性,可以为桥墩群的设计及保护提供一定的参考,但是为了保证结果的精度,需要详细的地形数据,而且由于计算量过大,计算区域一般在≤1000 m的范围适宜。
Near the pier complex on the complex terrain, the water flow pattern has strong three-dimensional characteristics and should not be simulated by using empirical formula, one-dimensional and two-dimensional mathematical models. Considering the high cost of the physical model, the VOF three-dimensional mathematical model can be used to simulate . In order to enhance the ability of the model to capture the free surface, the fluid volume was first calculated using the traditional VOF and then the free surface was accurately tracked using the Lagrangian algorithm. After the actual engineering calculation, the results show that the Lagrangian VOF can accurately simulate the three-dimensional characteristics of pier height and pier before piers, which can provide some reference for the design and protection of pier groups. However, in order to ensure the results Accuracy requires detailed topographical data and, due to the computational complexity, the calculated area is generally within the range of ≤1000 m.