三角形波浪底板消力池自由水跃水力特性的数值模拟

发布时间：2019-05-13 20:20

【摘要】：自由液面的捕捉应用VOF法,气液两相流时均方程采用RNG湍流模型封闭,采用数值模拟的方法计算了6种工况下,三角形波浪底板消力池自由水跃的流体力学特性.采用有限体积法离散微分方程,速度与压力耦合求解使用了压力隐式算子分裂PISO(Pressure-Implicit with Splitting of Operators)算法.研究发现:波浪形底板表面附近有漩涡产生,漩涡沿顺时针方向旋转,漩涡的尺寸沿程逐渐减小;沿程横断面上的最大流速在不同工况下有相似的衰减规律;在闸门附近产生紊动耗散率和紊动动能最大值及最大变化梯度,随进口弗劳德数的增大紊动能和耗散率最大值也增大;理论消能率和实际消能率均随进口弗劳德数增大而增大.
[Abstract]:The VOF method is used to capture the free liquid level, and the time-averaged equation of gas-liquid two-phase flow is closed by RNG turbulence model. The hydrodynamic characteristics of the free hydraulic jump of triangular wave floor stilling pool under six working conditions are calculated by numerical simulation. The finite volume method is used to discretize the differential equations, and the pressure implicit operator split PISO (Pressure-Implicit with Splitting of Operators) algorithm) is used to solve the problem by coupling velocity and pressure. It is found that there is a whirlpool near the surface of the wavy bottom plate, the whirlpool rotates clockwise, the size of the vortex decreases gradually along the way, and the maximum velocity on the cross section has a similar attenuation law under different working conditions. The maximum turbulent dissipation rate and turbulent kinetic energy and the maximum gradient of turbulent kinetic energy are produced near the gate, and the maximum turbulent energy and dissipation rate also increase with the increase of the imported Froude number, and the theoretical energy dissipation rate and the actual energy dissipation rate increase with the increase of the imported Froude number.
【作者单位】：西安理工大学西北旱区生态水利工程国家重点实验室;
【分类号】：TV135

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