非淹没圆柱群局部水流场特征分析

Study on the characteristics of local flow through a circular array of non-submerged cylinders

本文基于带自由表面水动力学数值模型,采用双方程k-ω的剪切应力输运(SST)湍流模式,对非淹没刚性圆柱群水流场进行了三维数值模拟。通过与实验数据的对比分析,验证了模型的有效性及模拟精度。通过圆柱群绕流场特征的模拟分析,探究了不同圆柱雷诺数和固体体积分数对柱群内剪切层渗入长度(δ)、柱群后尾流区剪切层长度以及床面应力空间分布特征的影响。

A 3D numerical simulation for the flow through a circular array of non-submerged rigid cylinders is performed using hydrodynamic numerical model with free surface coupled with SST（shear strain transport） k- ω turbulent model. The model is first verified and validated by means of the comparison analysis with experimental data. The characteristic of circumferential flow field is analyzed to study the shear layer infiltration length inside the patch, steady shear layer length in the wake region and the spatial distribution of the bed shear stress induced by flows with different cylinder Reynolds numbers and different solid volume fraction.