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The Blockage Effects for the Unsteady Characteristics of the Near Wake Flows Behind a Bluff Body

[+] Author Affiliations
Hiroshi Nakayama, Masafumi Hirota, Hiroshi Yamashita

Nagoya University, Nagoya, Japan

Yoshio Fukui

Mitsubishi Heavy Industries, Ltd., Takasago, Japan

Hideomi Fujita

Meijo University, Nagoya, Japan

Paper No. FEDSM2003-45190, pp. 949-956; 8 pages
  • ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
  • Volume 1: Fora, Parts A, B, C, and D
  • Honolulu, Hawaii, USA, July 6–10, 2003
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3696-7 | eISBN: 0-7918-3673-8
  • Copyright © 2003 by ASME


Unsteady flow characteristics behind a triangular-shaped bluff body were experimentally investigated in a water flow of the Reynolds number range ReD = 500∼3000. The effect of changing the blockage ratio, BR, from BR = 0.2 to 0.6, was investigated. The experimental data of the velocity were obtained by using cinematic particle image velocimetry (PIV) to map the unsteady velocity field around the vortex-generating region. Based on the measured data, influences of the blockage on time-averaged velocities, turbulence intensity distributions and Strouhal number were examined. Moreover, proper orthogonal decomposition (POD) was performed on fluctuating vorticity fields to identify the most energetic parts of the vorticity fluctuations.

Copyright © 2003 by ASME



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