采用RNG紊流模型计算静止环境中圆形负浮力射流

Simulation on the negatively buoyant jet in static ambient by RNG turbulence model

基于RNG方法的k ε湍流模型,运用混合有限分析算法对静止环境中圆形负浮力射流进行数值模拟。从射流的最大入侵高度、流速矢量图、温度等值线、湍动能等值线、横断面上的流速和温度分布以及轴线上温度变化等方面与有效的试验资料进行了较为全面的对比验证。两者的良好吻合表明,基于RNG方法的紊流模型和混合有限分析法的结合能较好地模拟变密度流动。

The renormalization grop (RNG) based on the k-ε turbulence model and the hybrid finite analytic method with staggered grids is used to calculate negatively buoyant jets in static ambient. The maximum penetration depth, velocity vector in the whole field, the temperature contours, the turbulent kinetic energy contours, the velocity and temperature distributions in cross sections and the axial temperature distribution are got by simulation. The calculated results are compared well with the available experimental date, which shows that the RNG based on the k-ε turbulence model amd the hybrid finite analytic method can be used to simulate the variation density flow.