Abstract
Instabilities and vortical structure in the near wake of a sphere and a circular disk are reviewed, together with those of an elliptic disk and rectangular plate which have two length scales. The linear global instability analysis (J. Fluid Mech. 254 (1993) 323) yields critical Reynolds numbers of regular and Hopf bifurcations of the sphere wake, which are in excellent agreement with direct numerical simulations and experiments. The Strouhal number of shedding of hairpin-like vortices in the sphere wake is significantly dependent on Reynolds number, reflecting changes in the wake such as transition from laminar to turbulent wakes. The vortex structure at high Reynolds numbers still remains to be clarified. Two periodic components of velocity fluctuations are found in the wake of elliptic disks and rectangular plates, being likely to be caused by global instability in the near wake.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Wind Engineering & Industrial Aerodynamics
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
