A Preliminary Study in Regularizing the Coherent Structures in a Planar, Weakly-Compressible, Free Shear Layer

2003 ◽  
Author(s):  
John Siegenthaler ◽  
Asad Asghar ◽  
Eric Jumper
Keyword(s):  
Shear Layer ◽  
Coherent Structures ◽  
Free Shear Layer ◽  
Weakly Compressible ◽  
Preliminary Study

Phase decorrelation of coherent structures in a free shear layer

1991 ◽  
Vol 230 ◽  
pp. 319-337 ◽  
Author(s):  
Chih-Ming Ho ◽  
Yitshak Zohar ◽  
Judith K. Foss ◽  
Jeffrey C. Buell
Keyword(s):  
Shear Layer ◽  
Coherent Structures ◽  
Physical Mechanism ◽  
Mixing Layer ◽  
Single Frequency ◽  
Free Shear Layer ◽  
Phase Jitter ◽  
Laminar Mixing

The vortices near the origin of an initially laminar mixing layer have a single frequency with a well-defined phase; i.e. there is little phase jitter. Further downstream, however, the phase jitter increases suddenly. Even when the flow is forced, this same transition is observed. The forcing partially loses its influence because of the decorrelation of the phase between the forcing signal and the passing coherent structures. In the present investigation, this phenomenon is documented and the physical mechanism responsible for the phase decorrelation is identified.

An Experimental Study of the Effect of Grid Turbulence on Shear Layer Evolution

2004 ◽  
Vol 126 (2) ◽  
pp. 286-290 ◽  
Author(s):  
Amy Warncke Lang ◽  
Begon˜a Gomez
Keyword(s):  
Experimental Study ◽  
Shear Layer ◽  
Reynolds Stress ◽  
Coherent Structures ◽  
Growth Rates ◽  
Free Stream ◽  
Water Tunnel ◽  
Grid Turbulence ◽  
Free Shear Layer ◽  
Entrainment Process

An experiment was performed in a shear layer water tunnel to determine the effect that grid turbulence, introduced within the meeting of the two streams, had on the evolution of a free shear layer. DPIV results show that the presence of grid turbulence inhibited the growth of the large coherent structures formed in the undisturbed shear layer, and thus led to an alteration of the entrainment process of free stream fluid into the shear layer. This caused more symmetry and various growth rates in the shear layer evolution. Also, the peak Reynolds stress magnitudes increased with the presence of grid turbulence.

scholarly journals Coherent structures in compressible free-shear-layer flows

1997 ◽  
Author(s):  
D.P. Aeschliman ◽  
R.S. Baty ◽  
C.A. Kennedy ◽  
J.H. Chen
Keyword(s):  
Shear Layer ◽  
Coherent Structures ◽  
Free Shear Layer
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