Three-dimensional modelling of free surface variation in a meandering channel
Three-dimensional modelling of free surface variation in a meandering channel
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蜿蜒河道中自由表面变化的三维建模
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
P. Naden
中科院分区：
文献类型：
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作者：
P. Rameshwaran;P. Naden
本文采用三维数值方法研究了曲流河道中自由湍流流场的计算。采用k-ε湍流模型求解三维reynolds -average连续性方程和Navier-Stokes方程进行稳态流动计算。用通用有限体积程序对模型方程进行了数值求解。对曲流明渠水流的水面空间变化进行了自由面处理。研究了网格分辨率对溶液的影响。通过将预测结果与英国洪道设施获得的大规模高质量河堤流实验数据进行比较，对模型的性能进行了评估。利用预测的水面高程、河床剪应力、流向和横向速度的分布来考察模型的性能。通过平面假设和表面孔隙率法对床层剪应力分布的模拟，对模型的预测能力进行了评价。结果表明，对水面空间变化进行自由面处理对于准确预测河床剪应力至关重要。
This paper presents a three-dimensional numerical study for the calculation of turbulent free surface flow in a meandering channel. The flow calculation is performed by solving the three-dimensional Reynolds-averaged continuity and Navier-Stokes equations with the k-ε turbulence model for steadystate flow. The model equations are solved numerically with a general-purpose finite-volume code. A free surface treatment for the spatial variation of the water surface in meandering open channel flow is employed. The effect of mesh resolution on the solution is also investigated. The performance of the model is assessed by comparing predicted results with the large-scale high-quality experimental data obtained from the UK Flood Channel Facility for inbank flow. The predicted distributions of water surface elevation, bed shear stress and streamwise and transverse velocities are used to investigate model performance. The predictive ability of the model is also assessed against the simulations with a planar surface assumption and use of the surface porosity method with regard to the distribution of bed shear stress. The results show that the free surface treatment for ihe spatial variation of the water surface is vital for the accurate prediction of bed shear stress.