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首页> 外文期刊>Heat Transfer Research >APPLICATION OF TRIPLE DECOMPOSITION TECHNIQUE IN NEAR-WAKE MEASUREMENTS OF A SQUARE CYLINDER
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APPLICATION OF TRIPLE DECOMPOSITION TECHNIQUE IN NEAR-WAKE MEASUREMENTS OF A SQUARE CYLINDER

机译：三重分解技术在方形圆筒近尾测量中的应用

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摘要

The flow properties and wake structures behind bluff bodies have fascinated researchers for many years. The Reynolds decomposition is a very common technique to approach these problems. However, some researchers tackle such problems with an alternative technique known as the triple decomposition. Since the flow structure of a bluff body comprises large-scale organized motion, the time-varying component in the wake region of a bluff-body flow consists of a periodic component (coherent structure) that can be distinguished from a random (incoherent) component. In the present study, incoherent turbulent flow structures in the near-wake region downstream of a square cylinder have been studied by employing triple decomposition. It was observed that the main incoherent turbulent kinetic energy production occurs in the region with the same width of square cylinder. Moreover, it was demonstrated that while a vortex is developing from one edge with maximum incoherent streamwise stress, the initiated shear layers from the other edge exhibit a maximum in incoherent transverse stress production.
机译：虚张声体背后的流动性和唤醒结构已经令人着迷于多年的研究人员。雷诺分解是一种方法来接近这些问题的一种非常常见的技术。然而，一些研究人员用称为三重分解的替代技术来解决这些问题。由于凹槽体的流动结构包括大规模有机运动，因此诈唬体流的唤醒区域中的时变分量由可以与随机（非连锁）组件区分开的周期性部件（相干结构）组成。在本研究中，通过采用三重分解研究了方形圆筒下游的近唤醒区域中的非相干湍流结构。观察到，主要相连的湍流动能产生在具有相同方形圆柱宽度的区域中发生。此外，证明虽然涡旋从具有最大不相干的流动应力的一个边缘从一个边缘显影，但是来自另一个边缘的引发的剪切层表现出最大的不连贯应力产生。

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