论文部分内容阅读
本文从湍流两相流动基本理论出发，建立了挟沙水流的湍流液固两相流动的时均方程组和封闭模型．结合实际工程建立了定常悬沙淤积的二维水深平均的全场模型以及准三维模型．数值预报与潮汐水流物模试验比较表明：二维水深平均的全场模型模拟所得回流区内旋涡外缘的悬沙淤积量大于涡心处的悬沙淤积量，这一数值预报结果与物模试验结果不符，说明二维水深平均全场模型不适宜于预报悬沙淤积；准三维模型模拟所得回流区涡心处的悬沙淤积量大于旋涡外缘处悬沙淤积量而且回流区中的悬沙淤积厚度的数值预报结果与物模试验结果比较接近，这说明准三维模型用来预报回流区的悬沙淤积是可行的．
Based on the basic theory of turbulent two-phase flow, this paper establishes the time-averaged equations and closed models of turbulent liquid-solid two-phase flow of sediment-laden flow. Combined with the actual project, a two-dimensional water depth-averaged full-field model and quasi-three-dimensional model of suspended sediment deposition are established. Comparison between numerical prediction and tidal current model test shows that the two-dimensional depth-averaged whole-field model simulates that the volume of suspended sediment in the outer edge of the vortex in the recirculation zone is larger than the volume of suspended sediment in the vortex core. The experimental results do not match, indicating that the two-dimensional water depth model is not suitable for the prediction of suspended sediment deposition; quasi-three-dimensional model simulation backwash area at the vortex sediment deposition is greater than the amount of suspended sediment at the outer edge of the vortex and the reflux area The result of numerical prediction of sand deposition thickness is close to that of the model test, which shows that quasi-three-dimensional model is feasible to predict suspended sediment deposition in the backflow zone.