Large Eddy Simulation of a turbulent swirling coaxial jet
Large Eddy Simulation of a turbulent swirling coaxial jet
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DOI：
10.1504/pcfd.2010.031561
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发表时间：
2010-02
影响因子：
0.7
通讯作者：
K. Dinesh;A. Savill;K. Jenkins;M. Kirkpatrick
中科院分区：
文献类型：
--
作者：
K. Dinesh;A. Savill;K. Jenkins;M. Kirkpatrick
本文利用大涡模拟(LES)技术研究了空间演化的湍流同轴旋转射流的速度、被动标量混合以及间歇性。模拟捕捉到了势核，并预测了内部混合区的高水平湍流强度。概率密度函数(PDF)和径向间歇图显示了间歇性混合行为，特别是在流动的外部区域，速度的波动从旋转到非旋转迅速变化，反之亦然。PDF和径向间歇分布分别在靠近喷流中心线和远离喷流中心线时呈现出高斯和非高斯分布。
This work uses the Large Eddy Simulation (LES) technique to study velocity and passive scalar mixing along with intermittency of a spatially evolving turbulent coaxial swirl jet. The simulations captured the potential core and also predicted high level turbulence intensities in the inner mixing regions. The Probability Density Functions (PDFs) and radial intermittency plots revealed an intermittent mixing behaviour especially in the outer region of the flow where the fluctuations of velocity rapidly change from rotational to irrotational and vice versa. The PDF and radial intermittency profiles exhibit Gaussian and non-Gaussian distributions close to the jet centreline and away from the centreline, respectively.