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本文采用非线性ｋ－ε紊流模型和Ｎａｏｔ－Ｒｏｄｉ代数应力模型（Ｎ－Ｒ模型）模拟复式断面明渠三维紊流．非线性ｋ－ε模型用张量形式推出，适用于边界形状复杂的流动，而Ｎ－Ｒ模型采用一种补充关系式反映计算点与界面距离对雷诺应力的影响，能较好地反映界面的作用．对一个复式断面明渠实例进行计算，给出了流速场（包括主流、二次流），壁画剪切力和雷诺应力分布，并与实验结果进行详细比较，还研究了浅滩粗糙壁面时的流动，除雷诺应力外，数值计算结果与实测数据基本吻合．
In this paper, the nonlinear k-ε turbulence model and the Naot-Rodi algebraic stress model (N-R model) are used to simulate the three-dimensional turbulent flow in the open channel of the multi-sectioned section. The nonlinear k-ε model is derived from the tensor form and is suitable for the complex flow of the boundary shape. The N-R model uses a complementary relation to reflect the influence of the calculated point and the interface distance on the Reynolds stress, which can better reflect the interface effect. An example of a double-channel open channel was calculated. The flow field (including the mainstream and secondary flow), the mural shear stress and the Reynolds stress distribution were given and compared with the experimental results. In addition, In addition to the Reynolds stress, the numerical results are basically consistent with the measured data.