Experimental investigation of flow field around an inclined square cylinder under forced oscillation

Tongming Zhou, Xiaofan Lou, Yucen Lu

Research output: Chapter in Book/Conference paperConference paperpeer-review

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Abstract

Flow structures in the wake of a square cylinder inclined with angles of α = 0⁰, 15⁰, 30⁰ and 45⁰ undergoing forced oscillation are investigated experimentally using particle image velocimetry (PIV) at Keulegan–Carpenter (KC) numbers in the range of 5–30 to examine the performance of the Independent Principle (IP). For KC < 6, there is no vortex shedding from the cylinder for all angles and as a result, the IP is valid. For KC-8-20, IP does not work satisfactorily because at large inclination angles, the shear layers are stretched and reattach to the upper and lower sides of the cylinder body for most of the time within one oscillating cycle. When KC is increased further to 25, the phenomenon of shear layer attachment when the cylinder is at the neutral position, as well as the significant shedding at the end of each half cycle, indicate a similar flow field for both vertical and inclined cylinders. The present investigation indicates that the IP is valid when KC ≤ 6 and KC ≥ 20 as it is analogous to a steady current.

Original languageEnglish
Title of host publicationAdvances in Fluid Mechanics XII
EditorsS. Hernandez, J. Ravnik, L. Skerget
PublisherWITPress
Pages51-60
Number of pages10
Volume120
ISBN (Electronic)9781784662875
DOIs
Publication statusPublished - 10 Jul 2018
Event12th International Conference on Advances in Fluid Mechanics, AFM 2018 - Ljubljana, Slovenia
Duration: 10 Jul 201812 Jul 2018

Conference

Conference12th International Conference on Advances in Fluid Mechanics, AFM 2018
Country/TerritorySlovenia
CityLjubljana
Period10/07/1812/07/18

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