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http://dx.doi.org/10.3795/KSME-B.2014.38.3.211

Harmonized Non-linear Interaction Between Different Two Vortex Shedding Frequencies  

Kim, Sang Il (Dept. of Mechanical Engineering, Kangwon Nat'l Univ.)
Seung, Sam Sun (Dept. of Vehicle Engineering, Kangwon Nat'l Univ.)
Lee, Seung-Chul (Division of Fire Protection Engineering, Kangwon Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.38, no.3, 2014 , pp. 211-217 More about this Journal
Abstract
This study analyzes the nonlinear interaction between two different vortex shedding frequencies from a cylinder with two diameters. In particular, two different vortex shedding frequencies are generated by preparing a cylinder having two diameters artificially. Flow velocity fluctuations behind the cylinder are measured three-dimensionally. Additionally, we fabricated a hole and placed a pressure transducer for measuring the pressure on the cylinder surface. The pressure signal from the pressure transducer is used as basic signal. A TSC(Trans Spectrum Coherence) is used for checking the strength of the nonlinear interaction between two different vortex shedding frequencies. As a result, the following are clarified: i) frequency distribution behind the cylinder, ii) three-dimensional flow state behind the cylinder through calculation of ensemble average, and iii) close relationship between the vertical vortex and change of low frequency by nonlinear interaction between two different vortex shedding frequencies from the cylinder with two diameters.
Keywords
Cylinder; Non-linear Interaction; Vortex Shedding Frequency;
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