Large eddy simulation on the  wake of a circular disk at a high Reynolds number

doi:10.3969/j.issn.0253-2778.2019.11.009

Journal of University of Science and Technology of China ›› 2019, Vol. 49 ›› Issue (11): 930-939.DOI: 10.3969/j.issn.0253-2778.2019.11.009

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Large eddy simulation on the wake of a circular disk at a high Reynolds number

XIE Chen

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

Received:2018-12-03 Revised:2019-05-06 Online:2019-11-30 Published:2019-11-30

Abstract

Abstract: Large eddy simulations (LES) were performed to study the turbulent characteristics in the wake of a circular disk normal to the free air stream (the diameter of the disk is 40 mm, thickness is 8 mm). The Reynolds numbers are 1×104, 1×105and 2.5×105 respectively. It was found that when Re>1×104 , the distributions of mean velocity and Reynolds stress as well as drag coefficient vary little with Re. Drag coefficient is mainly contributed by the pressure difference between the front and rear of the disk. By means of power spectral density analysis, three most influential instability mechanisms are disclosed in the large scale structure of a disk’s near wake: a very low frequency (St≈0.028) corresponding to the recirculation bubble pulsation along an axis of symmetry; a natural frequency (St≈0.138～0.146) related to antisymmetric helical vortex shedding; and a high frequency (St≈1.437) associated with Kelvin-Helmholtz instability of the separated shear layer.

Key words: large eddy simulation, circular disk, near wake

XIE Chen, ZHU Minming, CHEN Yiliang. Large eddy simulation on the wake of a circular disk at a high Reynolds number[J]. Journal of University of Science and Technology of China, 2019, 49(11): 930-939.

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Large eddy simulation on the wake of a circular disk at a high Reynolds number

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