Journal ArticleDOI
Leading-edge tubercles delay stall on humpback whale (Megaptera novaeangliae) flippers
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In this paper, the authors show that the addition of leading-edge tubercles to a scale model of an idealized humpback whale flipper delays the stall angle by approximately 40%, while increasing lift and decreasing drag.Abstract:
The humpback whale (Megaptera novaeangliae) is exceptional among the baleen whales in its ability to undertake acrobatic underwater maneuvers to catch prey. In order to execute these banking and turning maneuvers, humpback whales utilize extremely mobile flippers. The humpback whale flipper is unique because of the presence of large protuberances or tubercles located on the leading edge which gives this surface a scalloped appearance. We show, through wind tunnel measurements, that the addition of leading-edge tubercles to a scale model of an idealized humpback whale flipper delays the stall angle by approximately 40%, while increasing lift and decreasing drag.read more
Citations
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Journal ArticleDOI
Passive and Active Flow Control by Swimming Fishes and Mammals
Frank E. Fish,George V. Lauder +1 more
TL;DR: The vortex wake shed by the tail differs between eel-like fishes and fishes with a discrete narrowing of the body in front of the tail, and three-dimensional effects may play a major role in determining wake structure in most fishes.
Journal ArticleDOI
Effects of Leading-Edge Protuberances on Airfoil Performance
TL;DR: In this paper, the authors measured lift, drag, and pitching moments of airfoils with leading-edge sinusoidal protuberances in a water tunnel and compared with those of a baseline 63 4 -021 airfoil.
Journal ArticleDOI
Fish biorobotics: kinematics and hydrodynamics of self-propulsion
TL;DR: This paper discusses, using aquatic propulsion in fishes as a focal example, how using robotic models can lead to new insights in the study of aquatic propulsion, and uses two examples: pectoral fin function, and hydrodynamic interactions between dorsal and caudal fins.
Journal ArticleDOI
Performance Variations of Leading-Edge Tubercles for Distinct Airfoil Profiles
TL;DR: In this paper, the influence of sinusoidal leading-edge protrusions on the performance of two NACA airfoils with different aerodynamic characteristics was investigated and it was found that reducing the tubercle amplitude leads to a higher maximum lift coefficient and larger stall angle.
Journal ArticleDOI
Kinematics of foraging dives and lunge-feeding in fin whales
Jeremy A. Goldbogen,Jeremy A. Goldbogen,John Calambokidis,Robert E. Shadwick,Erin M. Oleson,Mark A. McDonald,John A. Hildebrand +6 more
TL;DR: Examination of body kinematics at depth reveals variable lunge-feeding behavior in the context of distinct kinematic modes, which exhibit temporal coordination of rotational torques with translational accelerations.
References
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Book
Theory of Wing Sections: Including a Summary of Airfoil Data
TL;DR: Theory of wing sections, including a summary of airfoil data, is discussed in this article, where the authors also present a theory of wing section sections, and the analysis of the data.
Journal ArticleDOI
Hydrodynamic design of the humpback whale flipper.
Frank E. Fish,Juliann M. Battle +1 more
TL;DR: The morphology and placement of leading edge tubercles suggest that they function as enhanced lift devices to control flow over the flipper and maintain lift at high angles of attack in the humpback whale.
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TL;DR: In this article, the authors present an overview of the basic aerodynamic properties of a single-rotor glider, including acceleration, speed, acceleration, and relative airspeed.
Journal ArticleDOI
Drag reduction in nature
D. M. Bushnell,K. J. Moore +1 more
TL;DR: In this article, a review of 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.
Journal ArticleDOI
Feeding behavior of the humpback whale, megaptera novaeangliae, in the western north atlantic
TL;DR: Several feeding be haviors reported for the first time, as well as a number of behaviors known from other areas but not previously reported for these waters, provide the beginning of a more complete catalog than has previously been available.