Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session L02: Turbulence: Wake
8:00 AM–10:10 AM,
Monday, November 20, 2023
Room: Ballroom B
Chair: Sean Symon, University of Southampton
Abstract: L02.00003 : Momentum entrainment of turbulent/turbulent interface in a cylinder wake*
8:26 AM–8:39 AM
Presenter:
Jiangang Chen
(Imperial college London)
Authors:
Jiangang Chen
(Imperial college London)
Oliver R Buxton
(Imperial College London)
turbulent/turbulent interface of a cylinder wake, in the context of the
diminishing of the coherent vortices from the near to the far field. The wake
was marked with a high-Schmidt-number fluorescent dye, and measurements combined
planar laser induced fluorescence (PLIF) and particle image velocimetry (PIV)
were carried out from x/d = 5 to 40, where x is the streamwise distance
from the cylinder center and d is the cylinder diameter. The cylinder is
placed at various downstream distances from various grids which are used to
generate the background turbulence, such that the the parameter space of
turbulence intensity and integral length scale was explored as widely as
possible. It is found that the momentum flux across the interfaces decays
substantially beyond x/d = 10. This is highly likely associated with the
rapidly decay of the coherent vortices when x/d >10, since the
strong coherent vortices in the near field (x/d < 10) can induce
intense engulfment. The scaling of the momentum entrainment while the wake
evolves downstream is also explored, the effect of the coherent motions on the
scaling will be reported in the meeting presentation.
*The authors would like to acknowledge the Engineering and Physical Sciences Research Council for funding the work under grant no. EP/V006436/1.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700