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本文直接对时均流的三维控制方程组沿深度积分且采用κ—ε双方程模型,建立了一个深度平均的紊流数学模型。数值计算采用有限容积法和SIMPLE程式。对分汊河段不规则边界的处理,本文提出了区域坐标系统法,将整个计算区域分成主道、左汊道及右汊道三个子区域,使每个子区域都具有规则边界,对子区域建立各自独立的坐标系统。迭代时先对于区域分别求解,然后耦合联解。子区域之间通过重叠区相互衔接。计算表明,这一方法精度较高、节省计算时间,且简单、易于实现。应用上述数学模型和数值方法,本文对不对称分汊河段的流场进行了计算,得出了计算区域的流场分布。计算结果比较准确地揭示了流场的内部特征。
In this paper, a depth-averaged mathematical model of turbulence is established directly by integrating the depth-timed three-dimensional control equations of time-averaged flow and using the κ-εtwo-equation model. Numerical calculation using finite volume method and SIMPLE program. In this paper, the regional coordinate system method is proposed in this paper to divide the entire calculation area into three sub-areas, main, left and right, so that each sub-area has a regular boundary. For the sub-area Establish their own independent coordinate system. Iteration first for the region to solve, and then coupled joint solution. The sub-areas are connected with each other through overlapping areas. The calculation shows that this method has high accuracy, saves calculation time and is simple and easy to implement. Applying the above mathematical model and numerical method, the flow field in the unsymmetrical sub-river section is calculated and the flow field distribution in the calculation area is obtained. The calculation results reveal the internal characteristics of the flow field more accurately.