基于CCHE模型的乌斯满引水枢纽水流数值模拟

Numerical simulation of flow in Wusiman diversion hub based on CCHE model

通过CCHE2D平面二维水沙数学模型,采用非线性k-ε紊流闭合模型,有限元法离散控制方程和时间行进格式求解方程对塔里木河乌斯满枢纽模型进行二维水流特性数值模拟。分析了枢纽上下游水流水面形态变化、断面流速变化以及水位高程变化。探讨了引水闸及泄洪闸对计算河段水流流态的影响。将各典型断面水面高程变化与物理模型试验实测值进行对比,得到二者水面变化趋势基本一致。结果表明:CCHE软件能较好地运用于引水枢纽工程水流运动的数值模拟。

Through CCHE2 D two- dimensional water and sediment mathematical model,the paper used the nonlinear k- ε turbulence closure model,discrete control equation of finite element method and solving equation of time traveling format to simulate the two- dimensional flow characteristics for Wusiman project model of Tarim River. Iit analyzed the changes of water surface morphology,velocity and water level elevation in upper and downstream of the project. It discussed the impact of water diversion sluice and sluice gate on flow pattern at calculation section. Furthermore,it compared the elevation change of water level every typical section with the test value of physical model. The comparison result shows that the trend of water level change of two methods is basic in agreement. The numerical simulation shows that CCHE software can be better used in the numerical simulation of water flow movement in water diversion hub.