浅水流动环境中垂向缝隙射流的数值模拟

为探求浅水流动环境中缝隙射流的流动规律,提出射流的影响范围公式与流动转变条件.应用体积率（VOF）方法跟踪处理自由水面,利用重组化群（RNG）紊动动能-紊动耗散率（k-ε）模型,对浅水流动环境中垂向缝隙射流进行数值模拟.研究流速分布和自由水面位置,对比数值模拟与物理模型试验结果,分析流动转变条件.结果表明,计算结果与试验结果吻合较好,射流出口断面垂向流速分布符合半无限域中射流流速的衰减规律,流速场分布及自由水面位置在小流速比、临界流速比及大流速比下存在不同特性,自由水面隆起高度和流速比、水深比有关,射流对上游的影响距离随流速比增大而增大.

Simulation of slit-type vertical turbulent jet in flowing shallow water

The jet's impaction scope and the transform condition of flow type were presented for studying the characteristics of slit-type jet in flowing shallow water. The free flow surface was tracked by applying the volume of fluid (VOF) method, and the renormalization group (RNG) kinetic energy-dissipation rate (k-ε) turbulent model was adopted to simulate the slit-type vertical turbulent jet in flowing shallow water. The velocity distribution and the free water-surface position were numerically simulated, and the results were compared to the physical experiment data, and then the transform condition of flow type was studied. Numerical simulation results agreed with the experimental results. The vertical velocity distribution of the jet outlet section fits the attenuation law of the jet velocity in semi-unlimited area; the characteristics of velocity fields and the positions of free water-surface are different for low velocity ratio, critical velocity ratio and high velocity ratio; the elevation of free water-surface is concerned with the velocity ratio and the water depth ratio; and the jet's impaction distance on the upriver increases with the increase of velocity ratio．