单双正挑丁坝平面二维回流数值模拟与验证分析

Numerical simulation and model analysis of two-dimensional circumfluence of single and double horizontal spur dikes

以平面二维水深平均浅水方程为基本依据,引入kε湍流模型.对非淹没状态下的单双正挑丁坝分别进行回流数值模拟,单丁坝模型计算分析结果与Nawachukwu的单丁坝实验吻合良好,能够准确模拟发生冲刷位置及范围,说明模型的可靠性;双丁坝模拟计算分析得出在合理间距下双丁坝较单丁坝的水流流态更平缓.因此本文建立的数学模型具有较高精度,能够用于实际河道的丁坝流场研究.

In accordance with the general shallow water equation of two dimensional water depth, this paper introduces κ - ε water flow model and conducts cireumfluenee numerical simulations separately on non-submerged single and double horizontal spur dikes. The result of the analysis of the single spur dike coincides with what was conducted by Nawachukwu. It precisely simulates the sluicing area which proves the reliability of the simulation. At the same time, the result of the analysis of the double spur dike shows that, with proper spacing arrangement, water flow of the double spur dike is gentler than that of the single spur dike. Therefore, this numerical simulation can serve as a scientific reference for research on flow distribution of spur dikes.