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The aerodynamic drag of grassland
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1950Abstract An improvised drag-plate apparatus, on the principle of that used by Sheppard (1947) on a concrete surface, but suitably modified in design, has been used for exploratory measurements of the aerodynamic drag of grassland. The grass cover was variable (1 to 15 cm. in height), and measurements were made at a number of positions
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Smart Morphable Surfaces for Aerodynamic Drag Control [PDF]
Advanced Materials, 2014 Smart Morphable Surfaces enable switchable and tunable aerodynamic drag reduction of bluff bodies. Their topography, resembling the morphology of golf balls, can be custom-generated through a wrinkling instability on a curved surface. Pneumatic actuation of these patterns results in the control of the drag coefficient of spherical samples by up to a ...
Terwagne, Denis +2 more
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Aerodynamic Drag of Perforated Plates
Nature, 1957WE have recently conducted wind-tunnel experiments to determine the aerodynamic drag of perforated plates at zero incidence by the wake transverse method. The plates have no protuberances, yet they are aerodynamically rough and give a drag comparable with that of plates covered with protruding roughness of the same size and spacing as the holes.
J. R. D. FRANCIS, P. MINTON
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Aerodynamic Drag on Vehicles in Tunnels
Journal of Basic Engineering, 1969The purpose of this study was to investigate the aerodynamic drag on vehicles moving in guideways of varying degrees of enclosure. The reason for this study was that several potential high speed ground transport system concepts involve high speed motion of vehicles in enclosed guideways for significant portions of their travel time.
S. William Gouse +3 more
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Cycling Aerodynamics: The Effect of Rider Position on Aerodynamic Drag
Volume 4A: Dynamics, Vibration and Control, 2013Competitive cyclists seek to maximize their efficiency by minimizing the influence of resistive forces. At the high speeds maintained during competition, aerodynamic drag is the primary resistive force. This paper investigates the influence of a cyclist’s body position using models of aerodynamic drag and elucidates the time benefit of various body ...
Alexander B. Fulton +3 more
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Prediction of Aerodynamic Drag.
1984Abstract : Drag prediction is the most important and challenging problem in aerodynamics. Experimental, empirical, analytical and numerical approaches, singly and in concert, have addressed this problem with varying degrees of success (and notable failures).
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Reducing the Aerodynamic Drag of Empty Coal Cars
Joint Rail, 2005As part of a DOE-sponsored study, the aerodynamic drag of 1/87th-scale coal cars was measured in a wind tunnel. The goal of the experiment was to measure the difference in drag between full and empty cars so as to determine if drag mitigation efforts are warranted.
B.L. Storms, J.C. Boss, D. Dzoan
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Advances in Aerodynamic Drag Extraction by Far-Field Methods
Journal of Aircraft, 2012Far-field methods for aerodynamic drag calculation and breakdown around aircraft configurations by Computational Fluid Dynamics are widely adopted. Recent improvements and advances of one of these algorithms are discussed. Because these methods rely for breakdown purposes on the detection of the boundary-layer region around the body, an analysis of ...
Marco Lanzetta +2 more
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Falling Paper Sheets to Investigate Aerodynamic Drag
The Physics TeacherMany physics education papers have tackled the issue of effectively introducing aerodynamic drag (“drag”, henceforth) by analyzing the motion of falling objects in diverse scenarios. However, to the best of our knowledge, no works have taken into consideration the relationship between the falling time and the cross-sectional area of a constant-mass ...
Andrea Bussani +2 more
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On the aerodynamic drag of ribbons
14th Aerodynamic Decelerator Systems Technology Conference, 1997D. Levin +5 more
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