Suppression of vortex shedding from a rectangular cylinder at low Reynolds numbers |
| |
| Institution: | 1. China Jiliang University, Hangzhou 310018, China;2. Ningbo Institute of Measurement and Testing, Ningbo 315048, China;1. State Key Laboratory of Aerodynamics, Mianyang, Sichuan 621000, China;2. Institute for Turbulence–Noise–Vibration Interaction and Control, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;3. Shenzhen Key Laboratory of Urban Planning and Decision Making, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;4. Parsons Brinckerhoff (Asia) Ltd., Kowloon Bay, Kowloon, Hong Kong Special Administrative Region;5. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong Special Administrative Region;1. Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699, USA;2. Department of Structural and Geotechnical Engineering, Sapienza University of Rome, Rome 00184, Italy;1. Politecnico di Torino, DAD, Viale Mattioli 39, I-10125 Torino, Italy;2. University of Pisa, DICI, Via Girolamo Caruso 8, I-56122 Pisa, Italy;3. University of Reggio Calabria, DIIES, Via Graziella, Feo di Vito, I-89122 Reggio Calabria, Italy |
| |
| Abstract: | Small elements of circular, square, triangular and thin-strip cross-sections are used to suppress vortex shedding from a rectangular cylinder of stream-wise to transverse scale ratio L/B=3.0 at Reynolds numbers in the range of Re=V∞B/ν=75–130, where V∞ is the on-coming velocity of the stream, and ν is the kinematic viscosity. The relative transverse dimension of the small element b/B is fixed at 0.2. The results of numerical simulation and visualization experiment show that, vortex shedding from both sides of the cylinder can be suppressed and the fluctuating drag and lift of the cylinder can be greatly reduced, if the element is placed in a certain region referred to as the effective zone. Comparisons at a specific Reynolds number indicate that the square element produces the largest size of the effective zone, whereas the triangular element yields the smallest. Results also show that the effective zone for the square element shrinks with increasing Re and disappears at Re>130. Independent of element cross-section shape and Reynolds number, the center of the effective zone is always at X/B=2.5–3.0 and Y/B≈1.0. The mechanism of the suppression is discussed from the view points of velocity profile stability and stress distribution. |
| |
| Keywords: | Vortex shedding Suppression Rectangular cylinder Low Reynolds number |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
