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Anisotropy in turbulent drag reduction
Physical Review Letters, 1990We have studied turbulent drag reduction using the technique of photon-correlation homodyne spectroscopy to measure turbulent velocity gradients in a dilute polymer solution. A large anisotropic suppression of turbulent velocity differences is found in the bulk region of the turbulent fluid and along the direction of the mean flow.
Tong, Penger +3 more
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1989
Over the past twenty-five years there has been extensive and sustained research aimed both at determining techniques for reducing skin friction drag and at explaining how successful techniques work. Certainly, one reason for pursuing this research is because of our need to drive systems faster and farther for the same power, but this is only part of ...
C. L. Merkle, S. Deutsch
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Over the past twenty-five years there has been extensive and sustained research aimed both at determining techniques for reducing skin friction drag and at explaining how successful techniques work. Certainly, one reason for pursuing this research is because of our need to drive systems faster and farther for the same power, but this is only part of ...
C. L. Merkle, S. Deutsch
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2015
Abstract : National Center for Computational Engineering (SimCenter), University of Tennessee at Chattanooga, focused on the development of a computational procedure to evaluate various drag reduction strategies for hydrodynamically bluff-body vehicles.
Bruce Hilbert +2 more
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Abstract : National Center for Computational Engineering (SimCenter), University of Tennessee at Chattanooga, focused on the development of a computational procedure to evaluate various drag reduction strategies for hydrodynamically bluff-body vehicles.
Bruce Hilbert +2 more
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AIChE Journal, 1975
AbstractDrag reduction by dilute solutions of linear, random‐coiling macromolecules in turbulent pipe flow is reviewed. The experimental evidence is emphasized in three sections concerned with the graphical display of established features of the phenomenon, data correlation and analysis, and the physical mechanism of drag reduction.
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AbstractDrag reduction by dilute solutions of linear, random‐coiling macromolecules in turbulent pipe flow is reviewed. The experimental evidence is emphasized in three sections concerned with the graphical display of established features of the phenomenon, data correlation and analysis, and the physical mechanism of drag reduction.
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21st Aerospace Sciences Meeting, 1983
In order to study the effect of ion wind on viscous drag, the equations of electrogasdynamics are solved numerically assuming the flow is incompressible, the electric field is steady and that the fluid velocity is negligible compared to ion drift velocity.
M. MALIK, L. WEINSTEIN, M. HUSSAINI
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In order to study the effect of ion wind on viscous drag, the equations of electrogasdynamics are solved numerically assuming the flow is incompressible, the electric field is steady and that the fluid velocity is negligible compared to ion drift velocity.
M. MALIK, L. WEINSTEIN, M. HUSSAINI
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Annual Review of Fluid Mechanics, 1991
Recent studies on the drag-reducing shapes, structures, and behaviors of swimming and flying animals are reviewed, with an emphasis on potential analogs in vehicle design. Consideration is given to form drag reduction (turbulent flow, vortex generation, mass transfer, and adaptations for body-intersection regions), skin-friction drag reduction ...
D. M. Bushnell, K. J. Moore
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Recent studies on the drag-reducing shapes, structures, and behaviors of swimming and flying animals are reviewed, with an emphasis on potential analogs in vehicle design. Consideration is given to form drag reduction (turbulent flow, vortex generation, mass transfer, and adaptations for body-intersection regions), skin-friction drag reduction ...
D. M. Bushnell, K. J. Moore
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AIAA Journal, 1981
It is shown that the mechanisms of forebody drag reduction by means of either a spike or a forward-facing jet are similar, with the maximum achievable drag reduction being of the same order. Because the jet may be a relatively cool gas, however, the forward facing jet has the additional capability of reducing the aerodynamic heating that is so severe ...
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It is shown that the mechanisms of forebody drag reduction by means of either a spike or a forward-facing jet are similar, with the maximum achievable drag reduction being of the same order. Because the jet may be a relatively cool gas, however, the forward facing jet has the additional capability of reducing the aerodynamic heating that is so severe ...
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Stokes’ Mechanism of Drag Reduction
Volume 2: Symposia, Parts A, B, and C, 2003The mechanism of drag reduction due to spanwise wall oscillation in a turbulent boundary layer is considered. Published measurements and simulation data are analyzed in light of Stokes’ second problem. A kinematic vorticity reorientation hypothesis of drag reduction is first developed.
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Hydrobionic Principles of Drag Reduction
International Journal of Fluid Mechanics Research, 2003The author considers characteristic features of submerged moving water animals from the point of view to reduce the energy consumption. Principles of functioning hydrobiont, peculiarities of morphology and physiology of a skeleton, muscles, skin covers, circulatory system and dolphin innervation with regard to the force action of biosphere to animals ...
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Journal of Fluid Mechanics, 2009
Two types of wall actuation in channel flow are considered: travelling waves of wall deformation (peristalsis) and travelling waves of blowing and suction. The flow response and its mechanisms are analysed using nonlinear and weakly nonlinear computations.
Hœpffner, Jérôme, Fukagata, Koji
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Two types of wall actuation in channel flow are considered: travelling waves of wall deformation (peristalsis) and travelling waves of blowing and suction. The flow response and its mechanisms are analysed using nonlinear and weakly nonlinear computations.
Hœpffner, Jérôme, Fukagata, Koji
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