Results 271 to 280 of about 117,422 (348)

Scaling and parameterization of stratified homogeneous turbulent shear flow

Journal of Fluid Mechanics, 2000
Homogeneous sheared stratified turbulence was simulated using a DNS code. The initial turbulent Reynolds numbers (Re) were 22, 44, and 89, and the initial dimensionless shear rate (S*) varied from 2 to 16. We found (similarly to Rogers (1986) for unstratified flows) the final value of S* at high Re to be ∼ 11, independent of initial S*. The final S*
Shih, Lucinda H., Koseff, Jeffrey R., Ferziger, Joel H., Rehmann, Chris R.   +3 more
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Management and Control of Turbulent Shear Flows

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 1993
AbstractThis survey will begin with a few historical aspects, describe some passive and active management methods, and discuss selected examples of manipulation of leading edge separation. It will then deal with some typical flow phenomena which are important for the manipulation of turbulent shear flows.
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Floc Rupture and Re-flocculation in Turbulent Shear Flow

Trans. of the XIIIth Fund. Res. Symp. Cambridge, 2005, 2005
The dynamics of fibre suspension flow, especially breakup and reformation of fibre flocs in a closed channel flow past a forward facing step was studied experimentally using fast CCD camera imaging and image analysis techniques that allow for simultaneous measurement of floc size and turbulent flow field of fibres.
Salmela, Juha, Kataja, Markku
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VORTEX MODELS OF SHEAR LAMINAR AND TURBULENT FLOWS

Journal of Mathematical Sciences
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Mironov, V. L., Mironov, S. V.
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Shear flow turbulence structure and its Lagrangian statistics

Fluid Dynamics Research, 1996
Summary: Rapid distortion theory and kinematic simulations are used to investigate the effects of a high shear rate on the structure of a homogeneous turbulent flow. The results show that an important effect of the shear acting on an initially isotropic turbulent flow is the selective amplification of structures having a large length scale in the mean ...
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MODELING AND CALCULATION OF TURBULENT TRANSPORT IN FREE-SHEAR FLOWS

Numerical Heat Transfer, 1987
The applicability of the combined bulk convection and gradient transport hypotheses for modeling turbulent diffusion is investigated. The resulting model equation, namely the one-equation model, is solved for free-shear flows by an implicit finite-difference method.
Biringen, S., Abdol-Hamid, K.
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INSTABILITY AND TURBULENCE IN SHEAR FLOWS

1993
Increasing attention is being paid to the large scale structure of turbulence and to the so-called “coherent” vortical structures which have been disclosed and studied for a number of turbulent shear flows in laboratory experiments and in numerical simulations.
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On management and control of turbulent shear flows

Progress in Aerospace Sciences, 1990
Abstract Concepts of turbulent flow control have become of growing importance during the last few years, following increased interest in the detailed structural scenario of turbulence—in particular our improved understanding of coherent structures on the one hand (the prerequisite), and a need for improvement of technological processes on the other ...
H.E. Fiedler, H.-H. Fernholz
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Instability and hydraulics of turbulent stratified shear flows

Journal of Fluid Mechanics, 2012
AbstractThe Taylor–Goldstein (T–G) equation is extended to include the effects of small-scale turbulence represented by non-uniform vertical and horizontal eddy viscosity and diffusion coefficients. The vertical coefficients of viscosity and diffusion, ${A}_{V} $ and ${K}_{V} $, respectively, are assumed to be equal and are expressed in terms of the ...
Liu, Zhiyu, Thorpe, S. A., Smyth, W. D.
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Zero and negative entrainment in turbulent shear flow

Journal of Fluid Mechanics, 1971
In certain accelerated flows the entrainment in the boundary layer, as normally defined, may be either zero or negative; on the other hand, there is no reason to suppose, on physical grounds, that the spread of mean or fluctuating vorticity should cease or become negative in such flows. This paradox is resolved in the present paper.
M. R. Head, P. Bradshaw
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