Доступ предоставлен для: Guest
Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336

Выпуски:
Том 26, 2019 Том 25, 2018 Том 24, 2017 Том 23, 2016 Том 22, 2015 Том 21, 2014 Том 20, 2013 Том 19, 2012 Том 18, 2011 Том 17, 2010 Том 16, 2009 Том 15, 2008 Том 14, 2007 Том 13, 2006 Том 12, 2005 Том 11, 2004 Том 10, 2003 Том 9, 2002 Том 8, 2001 Том 7, 2000 Том 6, 1999 Том 5, 1998 Том 4, 1997 Том 3, 1996 Том 2, 1995 Том 1, 1993

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v12.i1.40
pages 29-44

OSCILLATIONS AND VORTEX-INDUCED VIBRATIONS OF A TETHERED SPHERE IN A FLOW

M. Provansal
Institut de Recherche sur les Phenomenes Hors Equilibre (IRPHE) UMR CNRS 6594, Marseille, France, Technopole de Chateau-Gombert 49 rue F.Joliot-Curie, B.P146 13384 Marseille cedex France
T. Leweke
Institut de Recherche sur les Phenomenes Hors Equilibre (IRPHE) UMR CNRS 6594, Marseille, France, Technopole de Chateau-Gombert 49 rue F.Joliot-Curie, B.P146 13384 Marseille cedex France
L. Schouveiler
Institut de Recherche sur les Phenomenes Hors Equilibre (IRPHE) UMR CNRS 6594, Marseille, France, Technopole de Chateau-Gombert 49 rue F.Joliot-Curie, B.P146 13384 Marseille cedex France
C. Aprile
Institut de Recherche sur les Phenomenes Hors Equilibre (IRPHE) UMR CNRS 6594, Marseille, France, Technopole de Chateau-Gombert 49 rue F.Joliot-Curie, B.P146 13384 Marseille cedex France

Краткое описание

The behavior of a tethered sphere in a steady uniform flow has been investigated for two different configurations. Firstly, we consider a flow parallel to the tether in a small vertical water channel and, secondly, we perform experiments in a wind tunnel where the flow is perpendicular to the tether. Above a critical value Uc of the free-stream velocity, the sphere exhibits oscillations induced by the periodic vortex shedding. When the flow is parallel to the tether, new modes of oscillations of the sphere along circular or elliptic trajectories have been observed. The transition from steady to oscillatory movement of the sphere is shown to be hysteretic. The frequency and the amplitude of the oscillations, always locked to the natural frequency of the pendulum constituted by the tethered sphere, have been measured as a function of the reduced velocity. When the flow is perpendicular to the tether, the trajectories of the sphere have been recorded. The amplitude and frequency of the movement as well as the spectral density of the fluctuations of the location have been deduced by image processing.


Articles with similar content:

FLOW VISUALIZATION ON WAKES OF COMBUSTING JET IN A TRANSVERSE STREAM
Journal of Flow Visualization and Image Processing, Vol.3, 1996, issue 1
Jeng P. Wu, Rong F. Huang
FLAME STABILIZATION, ONSET OF OSCILLATIONS AND RE-STABILIZATION
ICHMT DIGITAL LIBRARY ONLINE, Vol.13, 2008, issue
Vadim N. Kurdyumov, Moshe Matalon
NUMERICAL SIMULATION OF CONVECTION-RADIATION COUPLING ON THERMAL PLUMES IN CAVITIES
International Heat Transfer Conference 16, Vol.9, 2018, issue
Didier Saury, Denis Lemonnier, Anne Sergent, Ying Wang, Patrice Joubert
WELL-CONTROLLABLE TURBULENCE GENERATOR USING A BIAXIALLY ROTATING SPHERE
TSFP DIGITAL LIBRARY ONLINE, Vol.5, 2007, issue
Nobukazu Ishii, Michio Nishioka, Kentaro Nakayama, Susumu Goto, Shigeo Kida
TRANSITION RADIATION OF MODULATED ELECTRON BEAM TRAVERSING THE WIRE SHIELD
Telecommunications and Radio Engineering, Vol.70, 2011, issue 4
Yu. O. Averkov, Vladimir M. Yakovenko