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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 - Role of wall-attached structures in the interface of the quiescent core region in turbulent pipe flow
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Role of wall-attached structures in the interface of the quiescent core region in turbulent pipe flow

机译：APS-APS流体动力学分部第70届年会-事件-壁连接结构在湍流中静态中心区域界面中的作用

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摘要

The effects of low- and high-speed structures on the interface of the quiescent core region are explored using direct numerical simulation data of turbulent pipe flow. The quiescent core region is a uniform momentum zone located at the center of the pipe flow, which contains the highest streamwise momentum with a low level of turbulence. The interface of the quiescent core region can be identified from the probability density function of the streamwise modal velocity. In the vicinity of the interface of the quiescent core region, the streamwise velocity changes abruptly. The abrupt jump in velocity causes an increase of the velocity gradient. The interface of the quiescent core region is similar to the laminar superlayer in turbulenton-turbulent interface. The interface of the quiescent core region contains the low- and high-speed structures. They can be classified into wall-attached and detached structures depending on the distance between the structures and the wall. The influence of the detached structures accounted for most of the number of detected structures is negligible due to its small volume. Conversely, the wall-attached structures adjacent to the interface have a huge influence on the statistical amount of the interface, such as entrainment characteristics.
机译：利用湍流管流的直接数值模拟数据，探索了低速和高速结构对静态核心区域界面的影响。静态核心区域是位于管道流中心的均匀动量区域，其中包含最高的水流动量和较低的湍流度。静态核心区域的界面可以从流态模态速度的概率密度函数确定。在静态核心区域的界面附近，流向速度突然变化。速度的突然跳跃导致速度梯度增加。静态核心区域的界面在湍流/非湍流界面中类似于层状上层。静态核心区域的界面包含低速和高速结构。根据结构和墙壁之间的距离，可以将它们分为与墙壁连接的结构和与墙壁分离的结构。由于其体积小，所以在大多数检测到的结构中，分离结构的影响可以忽略不计。相反，与界面相邻的附壁结构对界面的统计量具有极大的影响，例如夹带特性。

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