首页> 外文会议>Proceedings of the 2002 ASME Joint U.S.-European Fluids Engineering Conference >HOW HAS THE STUDY OF COHERENT STRUCTURES CONTRIBUTED TO OUR UNDERSTANDING OF TURBULENT FREE SHEAR FLOWS?
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HOW HAS THE STUDY OF COHERENT STRUCTURES CONTRIBUTED TO OUR UNDERSTANDING OF TURBULENT FREE SHEAR FLOWS?

机译:如何对理解湍流自由剪切流的相干结构进行研究?

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Recent applications of the 'slice POD' to the axisymmetric turbulent wake and jet are reviewed, and the results used to provide a critique of commonly held views about these flows. It is argued that the so-called 'coherent structures' are simply artifacts of the source conditions, and have little to do with the far downstream development of these flows. Also, experimental evidence is presented for the possible presence of Townsend's large eddies, eddies whose primary role is to warp the mean motion. Finally, classical linear stability analysis which 'predicted' that only az-imuthal mode-1 could be unstable for these flows is shown to be deficient, with the result that at very least modes-0,1 and 2 could be important, consistent with the experiments.
机译:审查了“切片POD”在轴对称湍流和射流中的最新应用,其结果用于对这些流动的共同观点提出批评。有人认为,所谓的“相干结构”只是源条件的产物,与这些流向下游的发展无关。此外,还提供了实验证据,证明汤森德的大型涡旋可能存在,而涡旋的主要作用是扭曲平均运动。最后,经典线性稳定性分析“预测”了只有az倒数模式1对于这些流可能是不稳定的,这被证明是不足的,结果至少有模式0、1和2可能很重要,与实验。

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