Streamline segment scaling behavior in a turbulent wavy channel flow

Streamline segment scaling behavior in a turbulent wavy channel flow
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简化湍流波状通道流中的分段缩放行为

DOI:
10.1007/s00348-016-2291-9
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发表时间:
2017
影响因子:
2.4
通讯作者:
Peters N
Peters N
中科院分区:
工程技术3区
文献类型:
--
作者:
Rubbert A;Hennig F;Klaas M;Pitsch H;Schröder W;Peters N

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采用粒子图像测速技术和直接数值模拟相结合的方法研究了波浪形通道内的湍流流动。为了分析经历有利和不利压力梯度的流动中的湍流结构及其标度行为,采用了Wang(J Fluid Mech 648:183-203,2010)提出的流线分割方法。这种方法产生联合统计信息的速度波动和长度尺度分布的非重叠结构内的流。特别是,联合统计特性显着的压力分布的影响。以前的研究结果,从扁平通道流和合成湍流模拟有关的归一化段长度分布可以复制,因此似乎在很大程度上是普遍的。然而,加速段和减速段的平均流线段长度在一个波长内变化,通常是对应于局部平均流的类型的延长段。此外,局部压力梯度被发现显着影响局部关节流线分割统计作为其固有的不对称性的主要影响。
A turbulent flow in a wavy channel was investigated by tomographic particle-image velocimetry measurements and direct numerical simulations. To analyze the turbulent structures and their scaling behavior in a flow undergoing favorable and adverse pressure gradients, the streamline segmentation method proposed by Wang (J Fluid Mech 648:183–203, 2010) was employed. This method yields joint statistical information about velocity fluctuations and length scale distributions of non-overlapping structures within the flow. In particular, the joint statistical properties are notably influenced by the pressure distribution. Previous findings from flat channel flows and synthetic turbulence simulations concerning the normalized segment length distribution could be reproduced and therefore appear to be largely universal. However, the mean streamline segment length of accelerating and decelerating segments varies within one wavelength typically elongating segments of the type which corresponds to the local mean flow. Furthermore, the local pressure gradient was found to significantly impact local joint streamline segmentation statistics as a main influence on their inherent asymmetry.
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