scholarly journals Shear flow generation by Reynolds stress and suppression of resistive g-modes

1993 ◽  
Author(s):  
H. Sugama ◽  
W. Horton
Keyword(s):  
Shear Flow ◽  
Reynolds Stress ◽  
Flow Generation

Reynolds stress and shear flow generation

2001 ◽  
Vol 43 (10) ◽  
pp. 1377-1395 ◽  
Author(s):  
S B Korsholm ◽  
P K Michelsen ◽  
V Naulin ◽  
J Juul Rasmussen ◽  
L Garcia ◽  
...  
Keyword(s):  
Shear Flow ◽  
Reynolds Stress ◽  
Flow Generation

Statistical analysis of the turbulent Reynolds stress and its link to the shear flow generation in a cylindrical laboratory plasma device

2008 ◽  
Vol 15 (9) ◽  
pp. 092309 ◽  
Author(s):  
Z. Yan ◽  
J. H. Yu ◽  
C. Holland ◽  
M. Xu ◽  
S. H. Müller ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Shear Flow ◽  
Reynolds Stress ◽  
Laboratory Plasma ◽  
Flow Generation ◽  
Plasma Device

Shear flow generation by drift waves revisited

2001 ◽  
Vol 8 (2) ◽  
pp. 459-462 ◽  
Author(s):  
P. N. Guzdar ◽  
R. G. Kleva ◽  
Liu Chen
Keyword(s):  
Shear Flow ◽  
Drift Waves ◽  
Flow Generation

The Development of the Reynolds Stress Tensor in a Turbulent Shear Flow

1970 ◽  
Vol 92 (4) ◽  
pp. 836-842
Author(s):  
S. J. Shamroth ◽  
H. G. Elrod
Keyword(s):  
Shear Flow ◽  
Stress Tensor ◽  
Linear Model ◽  
Reynolds Stress ◽  
Experimental Results ◽  
Turbulent Shear ◽  
Turbulent Shear Flow ◽  
Reynolds Stress Tensor ◽  
Theoretical Predictions

The development of the normalized Reynolds stress tensor, uiuj/q2, in the region upstream of a fully developed, turbulent shear flow is investigated. An inviscid, linear model is used to predict values of the normalized Reynolds stress tensor as a function of position. The theoretical predictions are then compared with experimental results.

scholarly journals On the distortion of turbulence by a progressive surface wave

2002 ◽  
Vol 458 ◽  
pp. 229-267 ◽  
Author(s):  
M. A. C. TEIXEIRA ◽  
S. E. BELCHER
Keyword(s):  
Shear Flow ◽  
Reynolds Stress ◽  
Wave Attenuation ◽  
Flow Instability ◽  
Laboratory Data ◽  
Breaking Waves ◽  
Stokes Drift ◽  
Streamwise Vortices ◽  
Vertical Vorticity ◽  
The Mean

A rapid-distortion model is developed to investigate the interaction of weak turbulence with a monochromatic irrotational surface water wave. The model is applicable when the orbital velocity of the wave is larger than the turbulence intensity, and when the slope of the wave is sufficiently high that the straining of the turbulence by the wave dominates over the straining of the turbulence by itself. The turbulence suffers two distortions. Firstly, vorticity in the turbulence is modulated by the wave orbital motions, which leads to the streamwise Reynolds stress attaining maxima at the wave crests and minima at the wave troughs; the Reynolds stress normal to the free surface develops minima at the wave crests and maxima at the troughs. Secondly, over several wave cycles the Stokes drift associated with the wave tilts vertical vorticity into the horizontal direction, subsequently stretching it into elongated streamwise vortices, which come to dominate the flow. These results are shown to be strikingly different from turbulence distorted by a mean shear flow, when ‘streaky structures’ of high and low streamwise velocity fluctuations develop. It is shown that, in the case of distortion by a mean shear flow, the tendency for the mean shear to produce streamwise vortices by distortion of the turbulent vorticity is largely cancelled by a distortion of the mean vorticity by the turbulent fluctuations. This latter process is absent in distortion by Stokes drift, since there is then no mean vorticity.The components of the Reynolds stress and the integral length scales computed from turbulence distorted by Stokes drift show the same behaviour as in the simulations of Langmuir turbulence reported by McWilliams, Sullivan & Moeng (1997). Hence we suggest that turbulent vorticity in the upper ocean, such as produced by breaking waves, may help to provide the initial seeds for Langmuir circulations, thereby complementing the shear-flow instability mechanism developed by Craik & Leibovich (1976).The tilting of the vertical vorticity into the horizontal by the Stokes drift tends also to produce a shear stress that does work against the mean straining associated with the wave orbital motions. The turbulent kinetic energy then increases at the expense of energy in the wave. Hence the wave decays. An expression for the wave attenuation rate is obtained by scaling the equation for the wave energy, and is found to be broadly consistent with available laboratory data.

On the nonlinear turbulent dynamics of shear-flow decorrelation and zonal flow generation

2001 ◽  
Vol 8 (6) ◽  
pp. 2691-2699 ◽  
Author(s):  
G. R. Tynan ◽  
R. A. Moyer ◽  
M. J. Burin ◽  
C. Holland
Keyword(s):  
Shear Flow ◽  
Zonal Flow ◽  
Flow Generation
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