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首页> 外文期刊>European Journal of Mechanics, B. Fluids >Large eddy simulation of three-dimensional plane turbulent free jet flow
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Large eddy simulation of three-dimensional plane turbulent free jet flow

机译：三维平面湍流自由喷射流动的大涡模拟

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A detailed study of a three-dimensional spatially developing planar turbulent jet has been carried out by large eddy simulation (LES). The jet Reynolds number is 4000 based on the inlet velocity and jet width. The dynamic Smagorinsky model (DSM) is used to resolve the subgrid scale stress tensor. The transition from laminar to turbulent flow has been numerically identified and discussed in details. The evolution of vortex roll ups, their transportation and final disintegration to smaller vortices have been visualized by the plot of is osurface of Q criterion. The coherent structures in a turbulent planar jet have been well demonstrated. The time series plots of lambda(2) criterion shows the swirl and shear nature of the evolving vortices and their passage in the downstream. The time averaged velocity at far downstream (x/D = 10 and 15) shows a self-similarity behavior where the flow has established a fully turbulent nature. The energy spectra are shown to exhibit the -5/3 power law. The proper orthogonal decomposition (POD) shows that 90% of the fluctuating kinetic energy is contained within the first 100 modes. The probability density function on the centerline (y/D = 15 and z/D = 2.5) for different x/D locations are plotted and the corresponding skewness and kurtosis values are reported for (u) over bar, (v) over bar, (w) over bar, D/p. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译：通过大涡模拟（LES）进行了对三维空间显影平面湍流射流的详细研究。喷气雷诺数为4000，基于入口速度和喷射宽度。动态SMAGORINSKY模型（DSM）用于解析子级压力张量。已经在数值上识别和讨论从层流到湍流的转变。通过Q标准的Osurface的图，涡旋卷起，它们的运输和最终崩解对较小的涡流的变化已经可视化。湍流平面射流中的相干结构得到了很好的说明。 Lambda（2）标准的时间序列图显示了不断变化涡旋的旋流和剪切性质及其在下游的通道。远程下游（X / D = 10和15）的时间平均速度示出了流动已经建立了完全湍流性质的自相似性行为。能量光谱显示出展示-5/3电力法。适当的正交分解（POD）表明90％的波动动能包含在前100个模式内。绘制不同X / D位置的中心线（Y / D = 15和Z / D = 2.5）上的概率密度函数，并报告（U）上方的相应偏斜和峰值值，而不是杆， （w）在酒吧，d / p。 （c）2017年Elsevier Masson SAS。版权所有。

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