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Flow around an oscillating circular disk at low to moderate Reynolds numbers

Lookup NU author(s): Dr Longfei Xiao, Xiaoqing Zhang, Professor Jianmin Yang, Professor Longbin Tao

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).

Abstract

Direct numerical simulations of the flow induced by a circular disk oscillating sinusoidallyalong its axis are performed. The aspect ratio ( = diameter=thickness) of thedisk is 10. The Reynolds number (Re), based on the maximum speed and the diameterof the disk, is in the range of 50 6 Re 6 800. The Keulegan-Carpenter number (KC) isin the range of 1 6 KC 6 24. Five flow regimes are observed in the considered Re-KCspace: (I) axisymmetric flow (AS), (II) planar symmetric flow in the low-KC region (PSL),(III) azimuthally rotating flow in the low-KC region (ARL), (IV) planar symmetricflow in the high-KC region (PSH) and (V) azimuthally rotating flow in the high-KCregion (ARH). The critical boundaries between different flow regimes are identified basedon the evolutions of the magnitude and direction of transverse force acting on the disk.For the non-axisymmetric flow regimes, the flow is one-sided with respect to the axis ofthe disk and is associated with a nonzero mean value of the transverse force acting onthe disk.

Publication metadata

Author(s): Tian X, Xiao L, Zhang X, Yang J, Tao L, Yang D

Publication type: Article

Publication status: Published

Journal: Journal of Fluid Mechanics

Year: 2017

Volume: 812

Pages: 1119-1145

Print publication date: 01/02/2017

Online publication date: 12/01/2017

Acceptance date: 21/11/2016

Date deposited: 18/01/2017

ISSN (print): 0022-1120

ISSN (electronic): 1469-7645

Publisher: Cambridge University Press

URL: https://dx.doi.org/10.1017/jfm.2016.800

DOI: 10.1017/jfm.2016.800

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