Results 291 to 300 of about 117,422 (348)

Turbulent flow in channels in terms of turbulent shear and normal stresses

AIChE Journal, 1995
AbstractThe local time‐averaged velocity, the mixed‐mean velocity, and the friction factor for fully turbulent flow between parallel plates and in round tubes and concentric circular annuli can be expressed in terms of integrals of the turbulent shear stress, The pressure distribution across a channel can similarly be expressed in terms of an integral ...
Stuart W. Churchill, Christina Chan
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Suppression of turbulence and transport by sheared flow

Reviews of Modern Physics, 2000
The role of stable shear flow in suppressing turbulence and turbulent transport in plasmas and neutral fluids is reviewed. Localized stable flow shear produces transport barriers whose extensive and highly successful utilization in fusion devices has made them the primary experimental technique for reducing and even eliminating the rapid turbulent ...
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Computational Simulation of Transitional and Turbulent Shear Flows

2005
A short review of numerical simulation approaches for transitional and turbulent shear flows is presented. Some results using large-eddy simulation (LES) are for canonical turbulent and transitional flows obtained with different subgrid-scale (SGS) models such as a variant of the approximate deconvolution (ADM) and high-pass-filtered (HPF) eddy ...
P. Schlatter, S. Stolz, L. Kleiser
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Scaling and Structure Functions in Turbulent Shear Flows

1991
An experimental investigation was made to obtain the statistics of velocity differences measured simultaneously in time at laterally separated spatial locations in a laboratory turbulent boundary layer flow. For large separations the measured probability density function of velocity differences is self-similar and near Gaussian.
C. W. Van Atta, K. Poddar
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On Turbulence Structure and Mixing Mechanism in Free Turbulent Shear Flows

1975
Some results of recent experimental investigations into the turbulence structure of simple shear flows including conditional sampling techniques are reported and discussed, with special emphasis on common features.
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Symmetries, Invariance and Scaling-Laws in Inhomogeneous Turbulent Shear Flows

Flow, Turbulence and Combustion, 1999
The analysis performed in the paper is based on the Reynolds averaged Navier-Stokes equations. Plane shear flows are investigated for different values of model parameters, and mean velocity profiles are obtained. The same is done for pipe flows. The mean velocity graphs are obtained for turbulent flows -- flat-plate turbulent boundary layer flow, two ...
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Waves and turbulence in sustained stratified shear flows

2018
The speed and efficiency of stratified turbulent mixing in homogenising temperatures, chemical composition and flow speeds makes it one of farthest reaching fluid mechanical phenomenon for life on earth. It is an aesthetically beautiful phenomenon, rich in complex physical behaviours and extremely challenging to model mathematically.
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Calculation of Turbulent Shear Flows for Atmospheric and Vortex Motions

AIAA Journal, 1971
Turbulent shear flows transport properties, computing atmospheric and vortex motions by invariant modeling of Reynolds stress term in boundary layer momentum ...
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Progress and Problems in Understanding Turbulent Shear Flows

1975
This discussion will be focussed on the plane turbulent mixing layer, featured in the illustration on the front of the program of this meeting. Another example of it is shown in Figure 1, while Figure 2 is a diagram which defines the basic parameters of this simplest of turbulent shear flows.
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Effect of Sheared Flow on the Growth Rate and Turbulence Decorrelation

Physical Review Letters, 2012
The effect of a large scale flow shear on a linearly unstable turbulent system is considered. A cubic equation describing the effective growth rate is obtained, which is shown to reduce to well-known forms in weak and strong shear limits. A shear suppression rule is derived which corresponds to the point where the effective growth rate becomes negative.
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