Study on the low frequency instability in the near wake of a circular disk

doi:10.3969/j.issn.0253-2778.2014.11.010

Journal of University of Science and Technology of China ›› 2014, Vol. 44 ›› Issue (11): 952-959.DOI: 10.3969/j.issn.0253-2778.2014.11.010

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Study on the low frequency instability in the near wake of a circular disk

ZHANG Xintai

Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China

Received:2014-09-24 Revised:2014-10-27 Online:2014-11-30 Published:2014-11-30

Abstract

Abstract: Based on data of LES (large eddy simulation) and hot wire anemometry, the low frequency instability in the near wake of a circular disk at Re=104 was studied by wavelet analysis and FFT method. It is found that, besides Kelvin-Helmholtz frequency StKH≈16 and vortex shedding frequency StV≈014, there are two low frequencies, namely StL1≈002 and StL2≈003. Further study shows that the two frequencies are correlated with the azimuthal motion of the vortex shedding location and the pumping motion of the recirculation region, respectively. The study presents a reasonable explanation of the scattering in the value of the low frequency in the near wake of the bluff body.

Key words: low frequency instability, near wake of circular disk, wavelet analysis, large eddy simulation, hotwire measurement

ZHANG Xintai, YANG Jianzhi, GU Hailin, QIAN Wanyi, LIU Minghou. Study on the low frequency instability in the near wake of a circular disk[J]. Journal of University of Science and Technology of China, 2014, 44(11): 952-959.

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Study on the low frequency instability in the near wake of a circular disk

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