Statistical study of anisotropic anomalous behavior of a cylinder wake
Statistical study of anisotropic anomalous behavior of a cylinder wake
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圆柱尾流各向异性异常行为的统计研究
DOI：
10.1007/s003480050275
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发表时间：
1999
影响因子：
2.4
通讯作者：
G. Guj
中科院分区：
文献类型：
--
作者：
V. Ninni;R. Camussi;G. Guj
用三热线风速计探头对中等Reλ各向异性湍流圆柱尾迹的速度差统计特性进行了实验研究。由于冯·卡曼涡旋的存在，能谱显示出明显的大尺度各向异性。尽管存在低Reλ和大尺度各向异性，但扩展自相似性允许确定较宽的标度范围和计算三个速度结构函数分量的标度指数，以检验间歇性异常。通过ESS和比较纵向和横向速度差概率分布函数，发现横向速度分量相对于纵向速度分量具有更强的间歇性。
An experimental investigation of the statistical properties of the velocity difference in an anisotropic turbulent cylinder wake at moderateReλis conducted by a triple hot-wire anemometer (HWA) probe. The energy spectra show a clear large scale anisotropy due to the presence of the Von Karman vortices. In spite of the lowReλand the large scale anisotropy, the extended-self-similarity (ESS) allows location of broad scaling ranges and the calculation of the scaling exponents of the three velocity structure function components in order to examine the intermittency anomalies. More intermittent behavior of the transverse velocity components with respect to the longitudinal one is found both by ESS and by comparison of the longitudinal and transverse velocity difference probability distribution functions (PDF).