Effect of fineness ratio of 0.5 - 2.0 on the wake structure around a circular cylinder measured using time-resolved PIV

Sho Yokota, Taku Ochiai, Takumi Ambo, Yuta Ozawa, Taku Nonomura, Keisuke Asai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the wake structure around freestream-aligned cylinder is investigated and its aerodynamic characteristics are discussed. A magnetic suspension and balance system (MSBS) was used to support a model without interference from a mechanical support device. Seven models with the fineness ratio (length to diameter, L/D) of 0.5, 1.0, 1.25, 1.5, 1.75, 2.0, and 2.25 were used. Reynolds number based on the cylinder diameter were and . 3.2 × 104 6.3 × 104 The velocity field was obtained by particle image velocimetry (PIV) in the center plane of the cylinder. In the case of fineness ratio over 1.5, the reattachment of shear layer was observed from the mean velocity field. The characteristic fluctuation of velocity was confirmed in power spectral density of streamwise component and vertical component. The length of the recirculation region is different depending on fineness ratio. The characteristic frequencies of the velocity fluctuation which seems to be due to recirculation bubble pumping and large-scale structure are observed from power spectrum density.

Original languageEnglish
Title of host publicationFluid Mechanics
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791859025
DOIs
Publication statusPublished - 2019 Jan 1
EventASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019 - San Francisco, United States
Duration: 2019 Jul 282019 Aug 1

Publication series

NameASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019
Volume1

Conference

ConferenceASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019
CountryUnited States
CitySan Francisco
Period19/7/2819/8/1

Keywords

  • Bluff body
  • Cylinder
  • Flow visualization
  • MSBS
  • Wake structure

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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