Reynolds number dependency of turbulent structures associated with amplitude wall pressure peaks in channel flow
Reynolds number dependency of turbulent structures associated with amplitude wall pressure peaks in channel flow
复制标题
与通道流中壁压峰值幅度相关的湍流结构的雷诺数依赖性
DOI：
10.1088/1873-7005/aabfa9
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
and Y. Tsuji
中科院分区：
文献类型：
--
作者：
A. Mehrez;Y. Yamamoto;and Y. Tsuji
我们研究了与充分发展的湍流通道流中正负高振幅壁压力峰值相关的湍流结构。该分析是通过对直接数值模拟中计算的河道流量数据集进行条件采样来执行的。根据通道半深度 h 和摩擦速度 u τ，雷诺数在 180 到 4000 之间变化。正壁压和负壁压事件与 Q 准则识别的小规模涡流结构相关。当按墙单位缩放时，结构的整体尺寸与雷诺数无关。正负壁压事件也与大规模扫掠运动（
We investigate the turbulent structures associated with positive and negative high-amplitude wall pressure peaks in fully developed turbulent channel flows. The analysis is performed by conditional sampling of a channel flow dataset computed in direct numerical simulations. The Reynolds number was varied from 180 to 4000 based on the channel half-depth h and the friction velocity u τ. Positive and negative wall pressure events were associated with small-scale vortex structures identified by Q-criterion. When scaled in wall units, the overall size of the structure was independent of Reynolds number. Positive and negative wall pressure events were also associated with a large-scale sweep motion (of