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Zoology and wildlife conservation

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Turbulent drag reduction by passive mechanisms

Article Abstract:

Experiments were undertaken in a fully developed turbulent channel flow wind-tunnel to demonstrate a passive means of controlling turbulence effectively. Specified protrusion patterns were introduced on the confining walls, interacting with energy bearing eddy structures, influencing the rate of energy dissipation. Small changes in protrusion arrangement were noted to alter the response of the system from drag decrease to drag enhancement.

Author: Sirovich, L., Karlsson, S.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
Drag (Aerodynamics)

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The right sort of roughness: skin-friction drag affects any surface moving through a fluid

Article Abstract:

Skin friction drag is greater when a flow is turbulent as in many engineering applications, and new drag reduction methods have helped to advance the theories of turbulence. Sirovich and Karlsson have developed a drag reduction method, by artificially randomizing the phases of vortices and oblique waves in a channel flow, which led to less bursting and consequently, drag reduction.

Author: Carpenter, Peter
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing, Search and navigation equipment, Turbulence Detectors, Aircraft navigation systems, Skin friction (Fluid dynamics)

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Universality of turbulence

Article Abstract:

Bramwell and colleagues have reported the discovery of a new type of turbulence universality, linking it with the thermodynamic equilibrium of solids. They have demonstrated the rate of power consumption P(t) in turbulent flow enclosed in a air gap between two counter-rotating disks. They argue that the integral Re is at a fixed constant value and that flow is confined.

Author: L'vov, Victor S.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
Observations, Nonlinear theories

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Subjects list: Research, Turbulence
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