Abstract
Direct numerical simulations of the flow induced by a circular disk oscillating sinusoidally along its axis are performed. The aspect ratio of the disk is 10. The Reynolds number , based on the maximum speed and the diameter of the disk, is in the range of . The Keulegan-Carpenter number is in the range of . Five flow regimes are observed in the considered-space: (I) axisymmetric flow (AS), (II) planar symmetric flow in the low-region (PSL), (III) azimuthally rotating flow in the low-region (ARL), (IV) planar symmetric flow in the high-region (PSH) and (V) azimuthally rotating flow in the high-region (ARH). The critical boundaries between different flow regimes are identified based on 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 of the disk and is associated with a non-zero mean value of the transverse force acting on the disk.
| Original language | English |
|---|---|
| Pages (from-to) | 1119-1145 |
| Number of pages | 27 |
| Journal | Journal of Fluid Mechanics |
| Volume | 812 |
| Early online date | 12 Jan 2017 |
| DOIs | |
| Publication status | Published - 10 Feb 2017 |
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Keywords
- flow-structure interactions
- vortex instability
- 0vortex interactions
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Flow around an oscillating circular disk at low to moderate Reynolds numbers. / Tian, Xinliang; Xiao, Longfei; Zhang, Xiangdong; Yang, Jianmin; Tao, Longbin; Yang, Dan.
In: Journal of Fluid Mechanics, Vol. 812, 10.02.2017, p. 1119-1145.Research output: Contribution to journal › Article
TY - JOUR
T1 - Flow around an oscillating circular disk at low to moderate Reynolds numbers
AU - Tian, Xinliang
AU - Xiao, Longfei
AU - Zhang, Xiangdong
AU - Yang, Jianmin
AU - Tao, Longbin
AU - Yang, Dan
PY - 2017/2/10
Y1 - 2017/2/10
N2 - Direct numerical simulations of the flow induced by a circular disk oscillating sinusoidally along its axis are performed. The aspect ratio of the disk is 10. The Reynolds number , based on the maximum speed and the diameter of the disk, is in the range of . The Keulegan-Carpenter number is in the range of . Five flow regimes are observed in the considered-space: (I) axisymmetric flow (AS), (II) planar symmetric flow in the low-region (PSL), (III) azimuthally rotating flow in the low-region (ARL), (IV) planar symmetric flow in the high-region (PSH) and (V) azimuthally rotating flow in the high-region (ARH). The critical boundaries between different flow regimes are identified based on 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 of the disk and is associated with a non-zero mean value of the transverse force acting on the disk.
AB - Direct numerical simulations of the flow induced by a circular disk oscillating sinusoidally along its axis are performed. The aspect ratio of the disk is 10. The Reynolds number , based on the maximum speed and the diameter of the disk, is in the range of . The Keulegan-Carpenter number is in the range of . Five flow regimes are observed in the considered-space: (I) axisymmetric flow (AS), (II) planar symmetric flow in the low-region (PSL), (III) azimuthally rotating flow in the low-region (ARL), (IV) planar symmetric flow in the high-region (PSH) and (V) azimuthally rotating flow in the high-region (ARH). The critical boundaries between different flow regimes are identified based on 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 of the disk and is associated with a non-zero mean value of the transverse force acting on the disk.
KW - flow-structure interactions
KW - vortex instability
KW - 0vortex interactions
UR - http://www.scopus.com/inward/record.url?scp=85009388263&partnerID=8YFLogxK
U2 - 10.1017/jfm.2016.800
DO - 10.1017/jfm.2016.800
M3 - Article
VL - 812
SP - 1119
EP - 1145
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
SN - 0022-1120
ER -