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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Streamwise Lumley Decomposition of the Turbulent Round Jet
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Streamwise Lumley Decomposition of the Turbulent Round Jet

机译：APS-流体动力学APS部门第70届年会-事件-湍流圆形射流的流向Lumley分解

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Stream-wise Lumley decomposition was performed from data acquired using 2C-PIV, in order to decompose the far-field of a free turbulent axi-symmetric jet at a Reynolds number of 20 000. The equilibrium similarity scaling yields a homogeneous turbulent field leaving only the radial direction non-homogeneous. Fourier modes are used to decompose the flow in the new homogeneous stream-wise direction, while proper orthogonal decomposition (POD) is used to decompose the field in the inhomogeneous radial direction. The scaling allows spectral analysis and energy density spectra to be performed which together with Reynolds stresses are decomposed to reveal their modal building blocks and energy contributions. The results from the decomposition reveal that the number of modes needed to reconstruct the field varies with radial position. Explanations for these results will be presented and discussed.
机译：从使用2C-PIV获取的数据中进行流式Lumley分解，以分解雷诺数为20000的自由湍流轴对称射流的远场。平衡相似标度产生均匀的湍流场，仅留下径向不均匀。傅里叶模式用于在新的均匀流方向上分解流，而适当的正交分解（POD）用于在非均匀径向上分解场。通过缩放，可以执行频谱分析和能量密度频谱，并与雷诺应力一起分解以揭示其模态构建基块和能量贡献。分解结果表明，重建磁场所需的模式数量随径向位置而变化。将介绍和讨论这些结果的解释。

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