弯道水流二维数值模拟及岸线整治的水动力分析方法研究

2-D numerical simulation of bend flow and research of hydrodynamic method on renovating bank

文章采用边界拟合坐标变换技术,克服了河道岸线蜿蜒曲折引起的计算困难,分析对比不同形式控制函数对所生成计算网格质量的影响,提出了一种简单易行的计算变换后网格地形的插值方法。建立了边界拟合坐标系下平面二维水流数学模型,对河北省境内的黎河西梁子河段水流情况进行模拟,计算结果与实测水位、流速资料吻合较好。根据二维恒定流动量方程,提出弯道岸线冲击力、剪切力的计算方法,以此为理论基础,计算了黎河西梁子河段岸线应力沿程分布。

In order to overcome difficulties of numerical simulation resulting from winding and meandering bank line of waterway,the boundary-fitted coordinate technology was used in this paper.By analyzing and comparing the quality of computational mesh among different governing functions,the best mesh generation model was proposed.A simple and practical interpolation method was presented.A plane two dimensional flow mathematical model under the boundary-fitted coordinate was established.Then the flow of Xiliangzi channel of Lihe river in Hebei Province was simulated by the model,and the hydraulic parameters calculated by the model were consistent with the measured water level and flow velocity.According to the momentum equation of two-dimensional steady flow,the method to calculate the impact force and shearing force was put forward.With this as the theoretical basis,the stress acted on the banks along the Xiliangzi channel of Lihe river was calculated.