scholarly journals On Variational Principles for Coherent Vortex Structures

1993 ◽  
pp. 399-403 ◽  
Author(s):  
B. W. Van de Fliert ◽  
E. Van Groesen
Keyword(s):  
Variational Principles ◽  
Vortex Structures ◽  
Coherent Vortex

scholarly journals On variational principles for coherent vortex structures

1993 ◽  
Vol 51 (1-2) ◽  
pp. 399-403 ◽  
Author(s):  
B. W. Fliert ◽  
E. Groesen
Keyword(s):  
Variational Principles ◽  
Vortex Structures ◽  
Coherent Vortex

Tensor characteristics of coherent vortex structures

1987 ◽  
Vol 27 (5) ◽  
pp. 735-739 ◽  
Author(s):  
G. A. Kuz'min ◽  
A. Z. Patashinskii
Keyword(s):  
Vortex Structures ◽  
Coherent Vortex

scholarly journals Signatures of coherent vortex structures in a disordered two-dimensional quantum fluid

2014 ◽  
Vol 89 (5) ◽  
Author(s):  
Matthew T. Reeves ◽  
Thomas P. Billam ◽  
Brian P. Anderson ◽  
Ashton S. Bradley
Keyword(s):  
Vortex Structures ◽  
Two Dimensional ◽  
Quantum Fluid ◽  
Coherent Vortex

A class of coherent vortex structures in rotating non‐neutral plasma

1993 ◽  
Vol 5 (5) ◽  
pp. 1421-1429 ◽  
Author(s):  
Steven M. Lund ◽  
Ronald C. Davidson
Keyword(s):  
Vortex Structures ◽  
Coherent Vortex ◽  
Neutral Plasma

Coherent vortex structures in an open channel flow with sand ridges by DNS

Shallow Flows ◽  
2004 ◽  
pp. 285-292
Author(s):  
T Ohmoto ◽  
S Hayashi
Keyword(s):  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Vortex Structures ◽  
Sand Ridges ◽  
Coherent Vortex

scholarly journals Experimental Investigation of Coherent Vortex Structures in a Backward-Facing Step Flow

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2629
Author(s):  
Fangfang Wang ◽  
Ang Gao ◽  
Shiqiang Wu ◽  
Senlin Zhu ◽  
Jiangyu Dai ◽  
...  
Keyword(s):  
Shear Layer ◽  
Shape Change ◽  
Flow Direction ◽  
Critical Distance ◽  
Vortex Structures ◽  
Free Shear Layer ◽  
Backward Facing Step ◽  
Step Flow ◽  
Image Velocimetry ◽  
Coherent Vortex

Coherent vortex structures (CVS) are discovered for more than half a century, and they are believed to play a significant role in turbulence especially for separated flows. An experimental study is conducted for a pressured backward-facing step flow with Reynolds number (Reh) being 4400 and 9000. A synchronized particle image velocimetry (PIV) system is developed for measurement of a wider range of velocity fields with high resolution. The CVS are proved to exist in the separation-reattachment process. For their temporal evolution, a life cycle is proposed that vortices form in the free shear layer, develop with pairings and divisions and finally shed at the reattachment zone, and sometimes new vortical structures are restructured with recovery of flow pattern. The CVS favor the free shear layer with frequent pairings and divisions particularly at the developing stage around x/h = 2~5 (x: distance from the step in flow direction, h: step height), which may contribute to the high turbulent intensity and shear stress there. A critical distance is believed to exist among CVS, which affects their amalgamation (pairing) and division events. Statistics show that the CVS are well organized in spatial distribution and show specific local features with the flow structures distinguished. The streamwise and vertical diameters (Dx and Dy) and width to height ratio (Dx/Dy) all obey to the lognormal distribution. With increase of Reh from 4400 to 9000, Dx decreases and Dy increases, but the mean diameter (D=0.5 × (Dx + Dy)) keeps around (0.28~0.29) h. As the increase of Reh, the vortical shape change toward a uniform condition, which may be contributed by enhancement of the shear intensity.

scholarly journals STUDY ON COHERENT VORTEX STRUCTURES OVER DUNE TYPE WAVY BED IN AN OPEN-CHANNEL FLOW BY DIRECT NUMERICAL SIMULATION

2002 ◽  
Vol 46 ◽  
pp. 385-390
Author(s):  
Syunichiro HAYASHI ◽  
Terunori OHMOTO ◽  
Kiyoshi TAKIKAWA
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Vortex Structures ◽  
Coherent Vortex

Tomographic PIV investigation on coherent vortex structures over shark-skin-inspired drag-reducing riblets

2015 ◽  
Vol 32 (2) ◽  
pp. 284-294 ◽  
Author(s):  
Shao-Qiong Yang ◽  
Shan Li ◽  
Hai-Ping Tian ◽  
Qing-Yi Wang ◽  
Nan Jiang
Keyword(s):  
Vortex Structures ◽  
Shark Skin ◽  
Tomographic Piv ◽  
Coherent Vortex

Coherent vortex structures in deforming granular materials

1997 ◽  
Vol 2 (3) ◽  
pp. 223-236 ◽  
Author(s):  
John R. Williams ◽  
Nabha Rege
Keyword(s):  
Granular Materials ◽  
Vortex Structures ◽  
Coherent Vortex
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