全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

圆盘近尾迹流场相关谱分析

DOI: 10.6052/1000-0879-13-340, PP. 161-167

Keywords: 圆盘钝体,近尾迹,大涡模拟,相关分析

Full-Text   Cite this paper   Add to My Lib

Abstract:

对Re=22000时径厚比D/h=5圆盘近尾迹开展大涡模拟数值研究.通过对x/D=1,2和8处脉动速度进行快速傅里叶变换(fastFouriertransformation,FFT),发现3个特征频率斯特劳哈尔数St2=0.123为自然脱落频率,与文献结果相符;较小频率St1=0.035,与回流区伸缩和剪切层附近涡旋脱落点的旋转相关;高频率St3=1.3~1.7则与剪切层湍流结构相关.通过分析截面r/D=2.8圆周上两点间流向速度相关系数、相干谱和相位谱,发现相关系数受涡旋脱落影响出现以30°或45°为周期的正负波动,表明轴面上涡旋脱落点具有随机性.

References

[1]  1 Shenoy AR, Kleinstreuer C. Flow over a thin circular disk at low to moderate Reynolds numbers. J Fluid Mech, 2008, 605: 253-262
[2]  2 Berger E, Scholz D, Schumm M. Coherent vortex structures in the wake of a sphere and a circular disk at rest and under forced vibrations. Journal of Fluids and Structures, 1990, 4: 231-257
[3]  3 Miau JJ, Leu TS, Liu TW, et al. On vortex shedding behind a circular disk. Exp. in Fluids, 1997, 23(3): 225-233
[4]  4 Johansson PBV, George WK, Woodward SH. Proper orthogonal decomposition of an axisymmetric turbulent wake behind a disk. Phys Fluids, 2002, 14(7): 2508
[5]  5 赵平辉,叶桃红,朱旻明等. 圆形射流湍流场的大涡模拟研究. 工程热物理学报,2012 33(3): 529-532 (Zhao Pinghui, Ye Taohong, Zhu Minming, et al. Study of the large eddy simulation of a circular jet. Journal of Engineering Thermophysics, 2012, 33(3): 529-532 (in Chinese))
[6]  6 Zhang P, Han C, Chen Y. Large eddy simulation of flows after a bluff-body: coherent structures and mixing properties. Journal of Fluids and Structures, 2013, 42: 1-12
[7]  7 Tomboulides AG, Orszag SA. Numerical investigation of transitional and weak turbulent flow past a sphere. J Fluid Mech, 2000, 416: 45-73
[8]  8 王明皓, 符松, 章光华. 竖直平板间自然对流的湍流频谱特性. 力学与实践, 2004, 26(1): 21-23 (Wang Minghao, Fu Song, Zhang Guanghua. Spectrum characteristics of turbulent natural convection between two vertical walls. Mechanics in Engineering, 2004, 26(1): 21-23 (in Chinese))
[9]  9 Rodriguez I, Borell K, Lehmkuhl D, et al. Direct numerical simulation of the flow over a sphere at Re=3 700. J Fluid Mech, 2011, 679: 263-287
[10]  10 Lee SJ, Bearman PW. An experimental investigation of the wake structure behind a disk. Journal of Fluids and Structures, 1992, 6(4): 437-450

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133