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ISSN オンライン: 2642-0554

TOPOLOGY AND TRANSPORT CHARACTERISTICS IN A TURBULENT TWO-CYLINDER WAKE

M.W. Yiu
Department of Mechanical Engineering The Hong Kong Polytechnic University Hung Horn, Kowloon, Hong Kong

Yu Zhou
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Institute for Turbulence-Noise-Vibration Interaction and Control Shenzhen Graduate School, Harbin Institute of Technology Shenzhen, 518055, China

H. J. Zhang
Department of Mechanical Engineering The Hong Kong Polytechnic University Hung Horn, Kowloon, Hong Kong

要約

This work aims to study experimentally the turbulent flow topology (vortex patterns), heat and momentum transport in the wake of two side-by-side circular cylinders. Spacing T between the cylinder axes was varied from 1.5d to 3d (d is the cylinder diameter). At T/d = 1.5, the phase-averaged velocity and temperature fields display a single vortex street. The two rows of vortices exhibit a great difference in the maximum vorticity and size and are asymmetrical in the lateral location with respect to the flow centreline. As T/d increases to 3.0, the flow is totally different. Two inphase streets occur initially. They are less stable, with vortices weakening faster, than the street at T/d = 1.5. By x/d = 40, one street only is identifiable. The momentum and heat transport characteristics of the flow are discussed by examining the coherent and incoherent momentum and heat flux vectors.