Published in Journal of Fluid Mechanics, Volume 48, Issue 3, January 1, 1971, pages 507-527.
Copyright 1971 Cambridge University Press. Publisher website: http://journals.cambridge.org/action/displayJournal?jid=FLM
NOTE: At the time of publication, the author William W. Durgin was not yet affiliated with Cal Poly.
A von Kármán vortex street generated in the usual way was subjected to a deceleration, thereby changing the ratio of longitudinal to lateral spacing between the vortices. Distortion of the individual vortices followed which resulted in annihilation of concentrated vortex regions and creation of a stationary wake flow. This wake flow was itself dynamically unstable and developed into a new vortex street of a different frequency from the initial one. The breakdown of the initial vortex street is qualitatively explained by considering the convection of a concentrated vortex region due to the motion imposed by all the other vortices.