Flow above the free end of a surface-mounted finite-height circular cylinder: A review |
| |
| Institution: | 1. Department of Mechanical, Automotive & Materials Engineering, University of Windsor, ON, Canada N9B 3P4;2. Department of Mathematics & Statistics, University of Windsor, ON, Canada N9B 3P4;3. Department of Civil & Environmental Engineering, University of Windsor, ON, Canada N9B 3P4;1. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;2. Institute for Infrastructure Engineering, University of Western Sydney, Penrith, NSW 2751, Australia;1. Marine Renewable Energy Laboratory, Department of Naval Architecture & Marine Engineering, University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145, USA;2. Yildiz Technical University, Istanbul, Turkey;3. Harbin Engineering University, Harbin, China;4. Department of Mechanical Engineering, University of Michigan, USA;1. College of Civil Engineering, Nanjing Tech University, Nanjing 211816, PR China;2. DICDEA, University of Campania “Luigi Vanvitelli”, Via Roma 9, 81031 Aversa, CE, Italy;1. Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB, Canada R3T 5V6;2. Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, Canada S7N 5A9;1. Department of Ocean Technology, Policy, and Environment, School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa-shi, Chiba, 277-8561, Japan;2. Department of Mechanical Engineering, Escola Politécnica, University of São Paulo, São Paulo, SP, Brazil;3. Department of Mobility Engineering, Joinville Campus, Federal University of Santa Catarina, Joinville, SC, Brazil |
| |
| Abstract: | The wake of a surface-mounted finite-height circular cylinder and the associated vortex patterns are strongly dependent on the cylinder aspect ratio and the thickness of the boundary layer on the ground plane relative to the dimensions of the cylinder. Above a critical aspect ratio, the mean wake is characterized by streamwise tip vortex structures and Kármán vortex shedding from the sides of the cylinder. Below a critical aspect ratio, a unique mean wake structure is observed. Recent experimental studies in the literature that used phase-averaged techniques, as well as recent numerical simulations, have led to an improved physical understanding of the near-wake vortex flow patterns. However, the flow above the free end of the finite circular cylinder, and its relationship to the near wake, has not been systematically studied. The effects of aspect ratio and boundary layer thickness on the free-end flow field are also not completely understood, nor has the influence of Reynolds number on the free-end flow field been fully explored. Common features associated with the free end include separation from the leading edge, a mean recirculation zone containing a prominent cross-stream arch (or mushroom) vortex, and reattachment onto the free-surface. Other flow features that remain to be clarified include a separation bubble near the leading edge, one or two cross-stream vortices within this separation bubble, the origins of the streamwise tip or trailing vortices, and various critical points in the near-surface flow topology. This paper reviews the current understanding of the flow above the free end of a surface-mounted finite-height circular cylinder, with a focus on models of the flow field, surface oil flow visualization studies, pressure and heat flux distributions on the free-end surface, measurements of the local velocity field, and numerical simulations, found in the literature. |
| |
| Keywords: | Bluff body Finite circular cylinder Free end Separated flow Recirculation zone Vortex structures Reattachment |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
