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http://dx.doi.org/10.3795/KSME-B.2004.28.8.953

Effects of Freestream Turbulence Intensity on the Flow Past a Circular Cylinder  

Hwang, Jong-Yeon (인하대학교 대학원 기계공학과)
Yang, Kyung-Soo (인하대학교 기계공학부)
Lee, Sung-Su (충북대학교 구조시스템공학과)
Lee ,Joon-Sik (서울대학교 기계항공공학부)
Lee, Sang-San (KISTI 수퍼컴퓨팅 센터)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.28, no.8, 2004 , pp. 953-960 More about this Journal
Abstract
In this study, the effects of freestream turbulence intensity on laminar-turbulent transition of separated shear layers in the wake of a circular cylinder are investigated using an immersed boundary method and LES. It is shown that the present numerical results without freestream turbulence for Re=3,900 based on bulk mean velocity and the cylinder diameter are in good agreement with other authors' experimental observations and numerical results, verifying our numerical methodology. Then a 'prescribed power spectrum' method is imposed to generate isotropic turbulence at the inlet of the computational domain at each time step. The principal effects of freestream turbulence intensity on flow statistics are investigated for Re=3,900. Statistical study reveals that the Reynolds stresses in the near-wake region gradually increase, and transition occurs further upstream, as the turbulence intensity increases. On the other hand, the bubble size behind the cylinder decreases as the turbulence intensity increases, which indicates that the freestream turbulence helps mean velocity be quickly recovered.
Keywords
Freestream Turbulence; Isotropic Turbulence; Turbulence Intensity; Immersed Boundary Method;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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