利用非结构化网格三维模型探讨桥墩周围流动现象

3-D unstructured grid model based study on flow phenomena around piers

本文简要介绍了一种基于非结构化网格的三维水动力模型,模型采用有限体积法的思想,考虑水流垂直方向流速,建立三维水动力控制方程。引用通量差分分裂(FluxDifferenceSplitting)算法对控制方程进行了数值求解。最后基于该模型建立了日本川上河上的包含两个桥墩河段的三维水动力模型。通过模拟计算,对两个桥墩周围的流动状态进行了分析。结果表明,该模型能够体现复杂情况下桥墩周围的流动现象。

An unstructured grid based 3-D hydrodynamic model is briefly described herein; of which the concept of the finite volume method is adopted for establishing a 3-D hydrodynamic governing equation under the consideration of vertical velocity of flow. Furthermore, the algorithm of flux difference splitting is introduced to solve the equation. Finally, a 3-D hydrodynamic model for the river-section of Kawakami River in Japan, that contains two piers, is established based on this model. Through the simulating calculation concerned, the flow patterns around both the piers are analyzed. The result shows that the flow patterns around piers under complicated conditions can surely be revealed by this model.