Title

Laminar Flow Past an Oscillating Circular Cylinder in Cross Flow

DOI

10.6119/JMST.201006_18(3).0005

Authors

Anh-Hung Pham;Chang-Yeol Lee;Jang-Hoon Seo;Ho-Hwan Chun;Hee-Jung Kim;Hyun-Sik Yoon;Jeong-Hu Kim;Dong-Woo Park;Il-Ryong Park

Key Words

oscillating cylinder ; vortex shedding ; wake structure ; drag ; lift

PublicationName

Journal of Marine Science and Technology

Volume or Term/Year and Month of Publication

18卷3期(2010 / 06 / 01)

Page #

361 - 368

Content Language

英文

English Abstract

The present study numerically investigates the two-dimensional laminar flow past a circular cylinder forced to oscillate transverse to the free-stream. The numerical simulations are performed at a various range of cylinder oscillation frequency ranged between 0.8 and 1.2 of the natural vortex shedding frequency, and the oscillation amplitude extended up to 50% of the cylinder diameter at one Reynolds number of 185 showing the typical two-dimensional vortex shedding. The immersed boundary method is used to handle the oscillating cylinder in a rectangular grid system using the finite volume method. The primary vortex shedding frequency has the same value with the exciting frequency. When the exciting frequency exceeds the natural vortex shedding frequency, the secondary vortex shedding frequency appeared with the value less than the natural shedding frequency. The time sequence of the wake structures near the cylinder at the extreme upper position reveals that a single vortex or a pair of vortices appears according to the time. A pair of vortices is composed of two saddle points and two centers of vortices, showing the occurrence of vortex switching phenomenon. The quantitative information about the flow variables such as the distribution of wall vorticity on the cylinder surface, drag and lift coefficients is highlighted.

Topic Category 基礎與應用科學 > 海洋科學
工程學 > 市政與環境工程
Times Cited
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