内河挖入式港池回流流速分布规律的数值模拟

摘要

Using k-s two equation model,the 3-D numerical model of dredged harbor basins was established to analyze the characteristics of flow field at the dredged harbor basins under different vertical velocities and different angles between basin axis and mainstream flow. The counterflow velocity distribution was obtained. The results show that the vertical velocity increases with a corresponding mainstream velocity,and average velocity increases gradually from the center to both sides of the basin cross-section. Comparison between the numerical results and model test data shows a satisfactory agreement.%采用k-ε双方程湍流数学模型,建立了三维内河挖入式港池数学模型,分析了不同主流流速及不同港池轴线与主流流向的夹角对内河挖入式港池内的水流运动特性的影响,获得了港池内回流流速的分布规律.研究结果表明,垂向流速值随着主流流速的增大也相应增大;回流横轴断面上各测线平均流速从回流中心向两侧逐渐增大.数值计算结果与模型试验的对比分析表明,数值模拟能够较好的模拟内河挖入式港池内的回流运动特性.