Nonlinear evolution of instabilities behind spheres and disks |
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| Authors: | P. Szaltys M. Chrust A. Przadka S. Goujon-Durand L.S. Tuckerman J.E. Wesfreid |
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| Affiliation: | 1. Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics, Ul Nowowiejska 24, 00665 Warsaw, Poland;2. PMMH (UMR 7636 CNRS - ESPCI - Univ. Paris 6 - Univ. Paris 7), 10 rue Vauquelin, 75005 Paris, France;1. Department of Ocean Engineering, Seoul National University, 1 Kwanak-ro, Kwanak-gu, Seoul 151-742, South Korea;2. Samsung Ship Model Basin, Marine Research Institute, Samsung Heavy Industries, Science Town, Daejeon 305-380, South Korea;1. Department of Applied Physics, Chongqing University, Chongqing 400044, China;2. Department of Physics, Key laboratory of Micro and Nano Photonic Structures (Ministry of Education), and Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, PR China;3. Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, PR China;1. School of Nuclear Engineering, Purdue University, West Lafayette, IN 47907, USA;2. Bechtel Marine Propulsion Corporation, Bettis Laboratory, West Mifflin, PA 15122, USA |
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| Abstract: | We have performed precise and systematic experiments with PIV in order to measure the velocity field in the wake of a solid sphere and of a disk in a water channel, in the range of intermediate Reynolds number in which stationary and oscillatory instabilities appear, including the hairpin shedding regime. From these experimental data, we study the modal decomposition of the streamwise vorticity in an unsteady case and we describe the full nonlinear evolution of the bifurcating branches. We compare these results with recent theoretical and numerical studies on instability in the vortex shedding process at these intermediate Reynolds numbers. |
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