0
research-article

SENSITIVITY TO ZONE COVERING OF THE MAP OF PASSIVE TURBULENCE CONTROL TO FLOW-INDUCED MOTIONS FOR A CIRCULAR CYLINDER AT 30,000<RE<120,000

[+] Author and Article Information
Hongrae Park

Daewoo Shipbuilding and Marine Engineering (DSME), Seoul, South KoreaDepartment Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI, 48109
hrpark@umich.edu

Eun Soo Kim

Vortex Hydro Energy, Inc., Dexter, MI 48130Department Naval Architecture and Marine Engineering University of Michigan, Ann Arbor, MI, 48109
bblwith@umich.edu

Michael M. Bernitsas

Mortimer E. Cooley Collegiate Professor of Naval Architecture and Marine Engineering and Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48109Vortex Hydro Energy, Inc., Dexter, MI 48130
michaelb@umich.edu

1Corresponding author.

ASME doi:10.1115/1.4035140 History: Received June 15, 2016; Revised October 20, 2016

Abstract

Passive turbulence control (PTC) in the form of two straight roughness strips with variable width, and thickness about equal to the boundary layer thickness, is used to modify the flow-induced motions (FIM) of a rigid circular cylinder. The cylinder is supported by two end-springs and the flow is in the TrSL3, high-lift, regime. The PTC-to-FIM Map, developed in previous work, revealed zones of weak suppression, strong suppression, hard galloping, and soft galloping. In this paper the sensitivity of the PTC-to-FIM Map to: (a) the width of PTC covering, (b) PTC covering a single or multiple zones, (c) PTC being straight or staggered is studied experimentally. Experiments are conducted in the Low Turbulence Free Surface Water Channel of the University of Michigan. Fixed parameters are: cylinder diameter D=8.89cm, m*=1.725, spring stiffness K=763N/m, aspect ratio l/D=10.29, and damping ratio ζ=0.019. Variable parameters are: circumferential PTC location αPTC∈[0°-180°], Reynolds number Re∈[30,000-120,000], flow velocity U∈[0.36m/s-1.45m/s]. Measured quantities are: amplitude ratio A/D, frequency ratio fosc/fn,w, and synchronization range. As long as the roughness distribution is limited to remain within a zone, the width of the strips does not affect the FIM response. When multiple zones are covered, the strong suppression zone dominates the FIM.

Copyright (c) 2016 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In