Influence of the low pressure filaments on the velocity statistics in a turbulent shear flow

2007 ◽  
pp. 89-97
Author(s):  
O. Cadot
Keyword(s):  
Shear Flow ◽  
Low Pressure ◽  
Turbulent Shear ◽  
Turbulent Shear Flow ◽  
Velocity Statistics

Effect of the shear parameter on velocity-gradient statistics in homogeneous turbulent shear flow

2011 ◽  
Vol 678 ◽  
pp. 14-40 ◽  
Author(s):  
JUAN C. ISAZA ◽  
LANCE R. COLLINS
Keyword(s):  
Reynolds Number ◽  
Shear Flow ◽  
Scaling Laws ◽  
Stokes Equations ◽  
Strain Tensor ◽  
Turbulent Shear ◽  
Small Scale ◽  
Turbulent Shear Flow ◽  
Velocity Statistics ◽  
Shear Parameter

The effect of the shear parameter on the small-scale velocity statistics in an homogeneous turbulent shear flow is investigated using direct numerical simulations (DNSs) of the incompressible Navier–Stokes equations on a 5123 grid. We use a novel pseudo-spectral algorithm that allows us to set the initial value of the shear parameter in the range 3–30 without the shortcomings of previous numerical approaches. We find that the tails of the probability distribution function of components of the vorticity vector and rate-of-strain tensor are progressively distorted with increasing shear parameter. Furthermore, we show that the shear parameter has a direct effect on the structure of the vorticity field, which manifests through changes in its alignment with the eigenvectors of the rate-of-strain tensor. We also find that increasing the shear parameter causes the main contribution to enstrophy production to shift from the nonlinear terms to the rapid terms (terms that are proportional to the mean shear) due to the aforementioned changes in the alignment. We attempt to explain these trends using viscous rapid distortion theory; however, while the theory does capture some effects of the shear parameter, it fails to predict the correct dependence on Reynolds number. Comparisons with recent experiments are also shown. The trends predicted by the DNS and the experiments are in good agreement. Moreover, the prefactors in the Reynolds number scaling laws for the skewness and flatness of the longitudinal velocity derivative are shown to have a statistically significant dependence on the shear parameter.

Open-loop control of compensation for optical propagation through a turbulent shear flow

1998 ◽  
Author(s):  
C. Truman ◽  
Lenore McMackin ◽  
Robert Pierson ◽  
Kenneth Bishop ◽  
Ellen Chen
Keyword(s):  
Shear Flow ◽  
Open Loop ◽  
Turbulent Shear ◽  
Turbulent Shear Flow ◽  
Open Loop Control ◽  
Loop Control ◽  
Optical Propagation

scholarly journals Scale dependence of the alignment between strain rate and rotation in turbulent shear flow

2016 ◽  
Vol 1 (6) ◽  
Author(s):  
D. Fiscaletti ◽  
G. E. Elsinga ◽  
A. Attili ◽  
F. Bisetti ◽  
O. R. H. Buxton
Keyword(s):  
Shear Flow ◽  
Strain Rate ◽  
Scale Dependence ◽  
Turbulent Shear ◽  
Turbulent Shear Flow

The structure of turbulent shear flow

1980 ◽  
Vol 70 (1-2) ◽  
pp. 187-188
Author(s):  
F.H. Busse
Keyword(s):  
Shear Flow ◽  
Turbulent Shear ◽  
Turbulent Shear Flow

Effects of turbulent shear flow on zooplankton distribution

1990 ◽  
Vol 37 (3) ◽  
pp. 447-461 ◽  
Author(s):  
Loren R. Haury ◽  
Hidekatsu Yamazaki ◽  
Eric C. Itsweire
Keyword(s):  
Shear Flow ◽  
Turbulent Shear ◽  
Turbulent Shear Flow ◽  
Zooplankton Distribution
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