What is it about?
We for the first time report the existence of some tertiary vortex phenomena for the flow past circular cylinder problem, which we term the sub-alpha and sub-beta phenomena. We also report a beta -like phenomenon which is very similar to the beta-phenomenon, but slightly differs in details. We offer a new perception of the alpha -phenomenon by defining its existence in a strong and weak sense along with a clearer characterization of the beta -phenomenon.
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Why is it important?
It shows that that there exists more intriguing tertiary vortex phenomena apart from the the secondary ones which are already well established. The structural bifurcation theory emphatically establishes that the new findings resulting from numerical simulations are not numerical artifacts, their presence is very much physical.
Perspectives
Interestingly, the origin of the article corresponds to a video made by the first author on the streamline patterns behind the cylinder at the initial period of the flow for Re=5000 from the data obtained from the numerical solution of the Navier-Stokes equations. After noticing these interesting structures in the movie, the authors embarked on more in-depth study on the same that eventually lead to the publication of the article.
Professor Jiten C Kalita
Indian Institute of Technology Guwahati
Read the Original
This page is a summary of: Unsteady separation leading to secondary and tertiary vortex dynamics: the sub-- and sub--phenomena, Journal of Fluid Mechanics, July 2013, Cambridge University Press,
DOI: 10.1017/jfm.2013.272.
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