Reynolds number and end‐wall effects on a lid‐driven cavity flow
Reynolds number and end‐wall effects on a lid‐driven cavity flow
复制标题
DOI：
10.1063/1.857491
复制
发表时间：
1989-02
影响因子：
4.6
通讯作者：
A. Prasad;J. Koseff
中科院分区：
文献类型：
--
作者：
A. Prasad;J. Koseff
在方形截面(深度=宽度=150 mm)、雷诺数(Re，基于盖子速度和空腔宽度)在3200到10000之间、跨向展宽比(SAR)在0.25：1到1：1之间的方形空腔中进行了一系列实验。聚苯乙烯微珠流动显示和二维激光多普勒风速仪(LDA)测量为空腔内的动量传递过程提供了新的线索。本文重点研究了平均速度剖面、均方根速度剖面以及∼(U‘V’)剖面在对称平面内沿水平和垂直中心线的Re和SAR值的变化。此外，还考察了大尺度“有序结构”和高频“湍流”速度起伏对总均方根的贡献。在低Re时，有序结构占据了流动中包含的大部分能量，而与SAR无关。然而，随着Re的增加，高频涨落的能量含量也增加了。这种趋势是..。
A series of experiments has been conducted in a lid‐driven cavity of square cross section (depth=width=150 mm) for Reynolds numbers (Re, based on lid speed and cavity width) between 3200 and 10 000, and spanwise aspect ratios (SAR) between 0.25:1 and 1:1. Flow visualization using polystyrene beads and two‐dimensional laser‐Doppler anemometer (LDA) measurements have shed new light on the momentum transfer processes within the cavity. This paper focuses on the variation, with Re and SAR, of the mean and the rms velocities profiles, as well as the ∼(U’V’) profile, along the horizontal and vertical centerlines in the symmetry plane. In addition, the contribution of the large‐scale ‘‘organized structures,’’ and the high‐frequency ‘‘turbulent’’ velocity fluctuations to the total rms is examined. At low Re, the organized structures account for most of the energy contained in the flow irrespective of SAR. As the Re increases, however, so does the energy content of the higher frequency fluctuations. This trend is ...