摘要
为研究恒定流和往复流饱和输沙情况下的泥沙扩散系数的规律,此文根据水沙两相紊流理论建立一个适用于全沙输移的二维数学模型,并利用物理模型试验的结果验证数学模型的正确性。研究表明,恒定流中水面处给定紊动动能为0的条件和给定紊动动能梯度为0的条件时,扩散系数的分布形式有很大的不同,但两种条件下浓度沿水深的分布没有明显的差别。往复流中泥沙扩散系数在水深方向上受浓度分布和往复流边界层内紊动特征的影响,呈现出一种十分复杂的时空变化规律。
A 2D two-phase flow model was applied to the study of sediment diffusivity in sediment-laden steady uniform flows and oscillatory flows. The numerical results were verified by available experimental data, It is shown that the presence of the sediment in a flow changes the diffusivity of the sediment. In the steady uniform flow, the variation of the mixing coefficient in the vertical direction depends on the boundary conditions of the turbulent kinetic energy at the surface but the distribution of the sediment concentration does not. In the oscillatory flow, it is demonstrated that the variation of the mixing coefficient in the vertical direction is complicatedly related to the distribution of the sediment concentration and the turbulence intensity.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2012年第2期141-146,共6页
Chinese Journal of Hydrodynamics
基金
水沙科学与水利水电工程国家重点实验室基金(2011-KY-1)~~
关键词
两相流
恒定流
往复流
扩散系数
数学模型
two-phase flow
steady uniform flow
oscillatory flow
sediment mixing coefficient
mathematic model
