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Lookup NU author(s): Dr Longfei Xiao, Xiaoqing Zhang, Professor Jianmin Yang, Professor Longbin Tao
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
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.
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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