基于 CATIA 建模的导流工程三维数值模拟研究
Three-Dimensional Numerical Simulation of River Diversion Based on CATIA Modeling

提出了包括实际工程地形的施工导流工程三维数值模拟的方法．基于 CATIA 模型设计软件建立了苏丹上 阿特巴拉水利枢纽儒米拉大坝分期导流三维模型，实现了实际工程地形与建筑物实体的融合，真实地反映了实际工 程的空间布置情况．将模型导入计算水动力学软件 Flow-3D 中，采用紊流双方程中的 RNG 模型，用 TruVOF 方法 进行自由表面的追踪，在 1,000,m3/s、5,380,m3/s 流量下，对溢洪道内部水流流速、流态、水面线、底板压力进行了 数值模拟．经过对比分析，证明了模拟结果与试验值吻合较好，从而验证了模型的可靠性．在取得水力学参数的基础上，考虑建筑物附近的河床冲刷，探讨了围堰附近覆盖层冲刷的数值模拟方法．该研究为解决复杂水利工程的三 维建模问题及相关数值模拟提供了新的方法，具有一定的参考价值和良好的应用前景．
The research puts forward three-dimensional numerical methods to solve river diversion problem based on real terrain．The CATIA model design software was used to design three-dimensional stage diversion project of Sudan Upper Atbara Rumela Dam，which combined buildings with realistic terrain．It realistically reflected the spatial arrangement of engineering．Then the model was put into the Flow-3D software．RNG two-equation turbulent model and TruVOF method in the free surface tracking were used．The flow velocity，water flow regime，water surface profile and bottom pressure in spillway were simulated when the flow rate is 1,000,m3/s and 5,380,m3/s， respectively．By comparison and analysis，calculation results are consistent with experimental measurements， indicating the validity of the model．After obtaining the hydraulic parameters，the research considered the river bed scour near the building，explored the method of numerical simulation of the overburden erosion．This research provides a new way for complicated three-dimensional hydraulic modeling and corresponding numerical simulation．The method would have a certain reference value and good prospect