Influence of the initial vibrationally nonequilibrium state of a medium on the structure of von Karman vortex street

2006 ◽  
Vol 18 (10) ◽  
pp. 105106 ◽  
Author(s):  
A. I. Osipov ◽  
A. V. Uvarov ◽  
N. A. Vinnichenko
Keyword(s):  
Nonequilibrium State ◽  
Vortex Street ◽  
Karman Vortex Street ◽  
Von Karman ◽  
Von Karman Vortex Street ◽  
Kármán Vortex Street ◽  
Karman Vortex ◽  
Von Kármán

scholarly journals von Kármán Vortex Street within an Impacting Drop

2012 ◽  
Vol 108 (26) ◽  
Author(s):  
Marie-Jean Thoraval ◽  
Kohsei Takehara ◽  
Takeharu Goji Etoh ◽  
Stéphane Popinet ◽  
Pascal Ray ◽  
...  
Keyword(s):  
Vortex Street ◽  
Karman Vortex Street ◽  
Von Karman ◽  
Von Karman Vortex Street ◽  
Kármán Vortex Street ◽  
Karman Vortex ◽  
Von Kármán

Discrete shedding modes in the von Kármán vortex street

1993 ◽  
Vol 5 (7) ◽  
pp. 1846-1848 ◽  
Author(s):  
Michael König ◽  
Bernd R. Noack ◽  
Helmut Eckelmann
Keyword(s):  
Vortex Street ◽  
Karman Vortex Street ◽  
Von Karman ◽  
Von Karman Vortex Street ◽  
Kármán Vortex Street ◽  
Karman Vortex ◽  
Von Kármán

scholarly journals On the phenomenon of vortex street breakdown

1971 ◽  
Vol 48 (3) ◽  
pp. 507-527 ◽  
Author(s):  
William W. Durgin ◽  
Sture K. F. Karlsson
Keyword(s):  
The Other ◽  
Vortex Street ◽  
Wake Flow ◽  
Karman Vortex Street ◽  
Von Karman ◽  
Von Karman Vortex Street ◽  
Kármán Vortex Street ◽  
Karman Vortex ◽  
The Individual ◽  
Von Kármán

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.

The Influence of Electroosmotic Flow on the Von Kármán Vortex Street in the Wake of a Cylinder Located in a Microchannel

2015 ◽  
Author(s):  
Mathias Scholz ◽  
Dominik P. J. Barz
Keyword(s):  
Reynolds Number ◽  
Vortex Street ◽  
Cylinder Surface ◽  
Flow Topology ◽  
Karman Vortex Street ◽  
Von Karman ◽  
Von Karman Vortex Street ◽  
Kármán Vortex Street ◽  
Karman Vortex ◽  
Von Kármán

The von Kármán vortex street is a flow instability that is observed in the wake of a blunt body if a certain (cylinder) Reynolds number is exceeded. It is one of the classical problems in fluid mechanics and a vast amount of research has been dedicated to the investigation of the fundamentals of this phenomenon. The present study is concerned with the numerical simulation of the flow in a microchannel having a cylinder located in its channel center. A pressure driven flow is induced in the channel described by the channel Reynolds number. The cylinder is subjected to an externally-applied electric field that causes electroosmosis in the electrical double layer which is present around the cylinder surface. In this setup, two distinctions to the classical von Kármán vortex street can be noted. On the one hand, the presence of the microchannel walls confines the flow field in lateral direction. On the other hand, the electroosmotic slip velocity impacts the flow topology in the vicinity of the cylinder and, thus, may have an impact on the formation and the periodic nature of the von Kármán vortex street. Various numerical simulations are performed to investigate the influence of the cylinder-diameter-to-channel-width ratio and the direction of the electrical field.

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