复式河槽漫滩水流的三维数值计算

采用紊流模型中的雷诺应力模型(RSM)对非对称复式河槽水流的三维紊流进行了数值模拟。数值模拟计算结果与试验结果的比较表明RSM能够很好地模拟滩槽交互区内的二次流、主流速分布和床面剪切力,此模型模拟复式河槽是可靠的。最后用RSM模拟了对称复式河槽在不同水深下的流速场及床面剪切力分布,得出当水深增加时,滩槽交互区二次流动纵向涡增强,而浅滩主流速及床面剪切力迅速增大的结论。

Three-dimensional numerical calculation of overbank flow in compound channel

The Reynolds stress model(RSM) was adopted to simulate the turbulent flow in asymmetric open channel.The comparison of the simulated result with experimental data shows that RSM is reliable for simulation of the secondary current,the primary mean velocity and bed shear stress in the junction region of the main channel and the flood plain.Then,RSM was used for simulation of the flow field and bed shear stress distribution in symmetric compound channel at different water depths.It is concluded that,with the increase of the water depth,the longitudinal vortex of the secondary current in the junction region is intensified,and the main flow velocity and bed shear stress increase rapidly.