Unsteady flow structure in the wake of the sphere

A. Leder; D. Geropp

doi:10.1117/12.150495

6 August 1993 Unsteady flow structure in the wake of the sphere

A. Leder, D. Geropp

Proceedings Volume 2052, Fifth International Conference on Laser Anemometry: Advances and Applications; (1993) https://doi.org/10.1117/12.150495
Event: Laser Anemometry: Advances and Applications: Fifth International Conference, 1993, Koningshof, Veldhoven, Netherlands

Abstract

Detailed velocity data of the unsteady flow downstream of a sphere model were analyzed using a combination of a two channel Laser Doppler system and a hot wire anemometer. This set-up yields mean values at constant phase of the quasiperiodic vortex shedding process and thus delivers new insights into the instability mechanisms of a free shear layer and the forming of large scale vortices. The results show that the shearlayer instability shortly after flow separation induces an amplification of the longitudinal Reynolds normal stress component while the extremum in the transverse Reynolds normal stress is initiated by a rotating helical vortex structure which emanates from the rear end of the separation zone. The coherence length of the vortex structure is five sphere diameters D.

Citation Download Citation

A. Leder and D. Geropp "Unsteady flow structure in the wake of the sphere", Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); https://doi.org/10.1117/12.150495

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available