Turbulence structure in free shear layers.

AIAA Journal ◽  
1966 ◽  
Vol 4 (11) ◽  
pp. 1971-1978 ◽  
Author(s):  
P. O. A. L. DAVIES
Keyword(s):  
Shear Layers ◽  
Turbulence Structure ◽  
Free Shear Layers

Bistable Flow Patterns in a Free Surface Water Channel

1989 ◽  
Vol 111 (4) ◽  
pp. 408-413
Author(s):  
E. W. Adams ◽  
A. I. Stamou
Keyword(s):  
Free Surface ◽  
Surface Water ◽  
Stable State ◽  
Flow Patterns ◽  
Shear Layers ◽  
Turbulence Structure ◽  
Mean Flow ◽  
Free Shear Layers ◽  
Side Flow ◽  
Bistable Flow

A series of experiments is reported on a free surface water tunnel with a slot inlet centered at mid-depth in which the flow exhibited equally probable bistable flow patterns. The two flow fields are strongly asymmetric even when the geometry is symmetric and consists of a long stall on one side of the inlet and a short stall on the opposite side. Flow visualization and laser-Doppler velocimetry were performed to examine the flow structure of both stable states in detail. Results showed that the mean flow and turbulence structure of the two bistable states are largely mirror images of each other within the separation zone. The effect of the wall on the flow is minor, only very close to the wall/free surface did the difference in wall constraints cause the two flow patterns to diverge. After reattachment both flows relax to free-surface channel flow. It is shown that the bistable flow pattern results from the interaction of the free shear layers and that only strong disturbances in the free shear layers can cause the flow in one stable state to switch to the other stable state. Bistable flow exists for geometries with asymmetry up to 10 percent for the expansion ratio studied.

An Enhanced Flow Visualization Technique for Planar Free Shear Layers

AIAA Journal ◽  
1984 ◽  
Vol 22 (3) ◽  
pp. 439-441 ◽  
Author(s):  
Y. Hsia ◽  
D. Baganoff ◽  
A. Krothapalli ◽  
K. Karamcheti
Keyword(s):  
Flow Visualization ◽  
Shear Layers ◽  
Visualization Technique ◽  
Free Shear Layers

Thin shear layers – The key to turbulence structure?

2010 ◽  
Vol 4 (2) ◽  
pp. 75-82 ◽  
Author(s):  
J.C.R. Hunt ◽  
I. Eames ◽  
J. Westerweel ◽  
P.A. Davidson ◽  
S. Voropayev ◽  
...  
Keyword(s):  
Shear Layers ◽  
Turbulence Structure

Transition in Compressible Free Shear Layers

1972 ◽  
Vol 9 (8) ◽  
pp. 623-624 ◽  
Author(s):  
STANLEY F. BIRCH ◽  
J. WAYNE KEYES
Keyword(s):  
Shear Layers ◽  
Free Shear Layers
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