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Measurement of vortex shedding in the wake of a sphere at $Re=465$

Published online by Cambridge University Press:  09 May 2019

L. Eshbal ,
V. Rinsky ,
T. David ,
D. Greenblatt Open the ORCID record for D. Greenblatt [Opens in a new window]  and
R. van Hout Open the ORCID record for R. van Hout [Opens in a new window]
L. Eshbal
Affiliation:
Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Technion city, Haifa 32000, Israel
V. Rinsky
Affiliation:
Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Technion city, Haifa 32000, Israel
T. David
Affiliation:
Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Technion city, Haifa 32000, Israel
D. Greenblatt
Affiliation:
Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Technion city, Haifa 32000, Israel
R. van Hout*
Affiliation:
Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Technion city, Haifa 32000, Israel
*
†Email address for correspondence: [email protected]
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Abstract

Flow in the wake of a sphere has been studied for at least the last hundred years. The three-dimensional (3-D) flow structure has been observed many times using dye visualization and prior to the direct numerical simulations by Johnson & Patel (J. Fluid Mech., vol. 378, 1999, pp. 19–70), its structure at a Reynolds number of approximately 300, was believed to consist of a one-sided chain of hairpin-like vortices. However, the numerical simulations by Johnson & Patel (J. Fluid Mech., vol. 378, 1999, pp. 19–70) also showed that so-called ‘induced’ vortices were generated. The present results are the first spatially resolved measurements that elucidate the 3-D vortex shedding cycle in the wake of a sphere at a Reynolds number of 465. Tomographic particle image velocimetry (tomo-PIV) enabled snapshots of the vortical structure and by combining these results with temporally resolved planar PIV, the ensemble averaged shedding cycle in the wake of the sphere was reconstructed. The present results clearly indicate that besides the ‘primary’ vortex chain shed from the sphere, secondary (‘induced’) vortices are generated by transforming transverse vorticity into streamwise vorticity as a result of the interaction between the sphere’s separating shear layer and the counter-rotating longitudinal vortices extending downstream from the sphere.

JFM classification

Vortex Flows: Vortex shedding Wakes/Jets: Wakes
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 870 , 10 July 2019 , pp. 290 - 315
Copyright
© 2019 Cambridge University Press 

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