108 Characteristics of Flow over Two Side-by-Side Circular Cylinders and Application of Wavelet in Switching Phenomenon

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概要

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• Wake characteristics and characteristics of switching flow behind two circular cylinders placed in side-by-side arrangement were investigated experimentally in a uniform flow at a Reynolds number of 5.5×(10)^4. In the bistable flow regime, T/D=0.2∿1.2 (T, spacing between the cylinders; D, diameter), when high/low-frequency mode switched to low/high-frequency mode, another short duration stable flow pattern (which can be termed an intermediate flow pattern) persisted in the intermediate time, in which the gap flow was oriented parallel to the free-stream flow and the Strouhal number was almost equal to that of a single cylinder. Wavelet analysis of velocity signals obtained from two hotwires corroborated the appearance of the intermediate flow pattern. In the case of synchronized vortex shedding and even in the intermediate flow pattern, a predominant in-phase synchronized vortex was found to shed.

• 一般社団法人日本機械学会の論文
• 2002-10-05

著者

• Alam Md.

  Department Of Mechanical Engineering Kitami Institute Of Technology

• SAKAMOTO H.

  Department of Congenital Birth Defects Monitoring, Japan Association of Obstetricians and Gynecologi

• Mahbub Alam

  Department of Mechanical Engineering, Kitami Institute of Technology

• Moriya M.

  Department of Mechanical Engineering, Kitami Institute of Technology

• Takai K.

  Department of Mechanical Engineering, Kitami Institute of Technology

• Moriya M

  Department Of Mechanical Engineering Kitami Institute Of Technology

• Moriya M.

  Department Of Applied Physics National Defense Academy

• Takai K

  Nagaoka Univ. Technol.

• Takai K.

  Department Of Chemistry Tokyo Institute Of Technology

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