The wake behind the sphere; analysis of vortices during transition from steadiness to unsteadiness

• Autorzy: Prządka W. , Miedzik J. , Gumowski K. , Goujon-Durand S. , Wesfreid J. E.
• Konferencja: Polish Conference of Fluid Mechanics (18 ; 21-25.09.2008 ; Jastrzębia Góra, Poland)
• Języki publikacji: EN

Abstrakty

EN

This paper reports about an experimental investigation of the wake behind a solid sphere on a low velocity hydrodynamical channel for the Reynolds number in the range 250-310. The aim of the work is to analyze the size and shape of the vortices' cores and its change as a function of the Reynolds number. Special attention is paid to the transition from stationary flow, characterized by two counter-rotating longitudinal vortices, to instationary flow. The two-coloured visualization of the wake in steady and unsteady regimes is also presented.

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Archives of Mechanics
• Rocznik: 2008
• Tom: Vol. 60, nr 6
• Strony: 467--474
• Opis fizyczny: Bibliogr. 10 poz.

Twórcy

autor

Prządka W.

autor

Miedzik J.

autor

Gumowski K.

autor

Goujon-Durand S.

autor

Wesfreid J. E.

• Warsaw University of Technolgy, Institute of Aeronautics and Applied Mechanics, ul. Nowowiejska 24, 00-665 Warsaw, Poland

Bibliografia

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• 3. E. ACHENBACH, Vortex shedding from spheres, J. Fluid Mech., 62, 209-221, 1974.
• 4. D. ORMIÈRES, Etude expérimentale et modélisation du sillage d'une sphère à bas nombre de Reynolds, PhD thesis, Université de Provence, France, 1999.
• 5. S. ORSZAG, A.G. TOMBOULIDES, G.E. KARNIADAKIS, Direct and large eddy simulations of axisymmetric wakes, AIAA Paper, p. 546, 1993.
• 6. T.A. JOHNSON, V.C. PATEL, Flow past a sphere up to a Reynolds number of 300, J. Fluid Mech., 378, 19-70, 1999.
• 7. D. ORMIÈRES, M. PROVANSAL, Transition to turbulence in the wake of a sphere, Physical Review Letters, 83, 80-83, 1999.
• 8. L. SCHOUVEILER AND M. PROVANSAL, Self-sustained oscillations in the wake of a sphere, Physics of Fluids, 14, 3846-3854, 2001.
• 9. M.C. THOMPSON, T. LEWEKE, M. PROVANSAL, Kinematics and dynamics of sphere wake transition, J. Fluids Struct., 15, 575-585, 2002.
• 10. K. GUMOWSKI, J. MIEDZIK, S. GOUJON-DURAND, P. JENFFER, J.E. WESFREiD, Transition to a time-dependent state of fluid flow in the wake of a sphere, Phys. Rev. E, 77, 5:055308, 2008.