Journal ArticleDOI
Passive and Active Flow Control by Swimming Fishes and Mammals
Frank E. Fish,George V. Lauder +1 more
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TLDR
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.Abstract:
What mechanisms of flow control do animals use to enhance hydrodynamic performance? Animals are capable of manipulating flow around the body and appendages both passively and actively. Passive mechanisms rely on structural and morphological components of the body (i.e., humpback whale tubercles, riblets). Active flow control mechanisms use appendage or body musculature to directly generate wake flow structures or stiffen fins against external hydrodynamic loads. Fish can actively control fin curvature, displacement, and area. 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.read more
Citations
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Closed-Loop Turbulence Control: Progress and Challenges
Steven L. Brunton,Bernd R. Noack +1 more
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Modeling of Biomimetic Robotic Fish Propelled by An Ionic Polymer–Metal Composite Caudal Fin
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Journal ArticleDOI
Numerical investigation of the hydrodynamics of carangiform swimming in the transitional and inertial flow regimes.
TL;DR: Numerical simulation helps elucidate the results of previous experiments with live fish, underscore the importance of scale (Re) effects on the hydrodynamic performance of carangiform swimming, and help explain why in nature this mode of swimming is typically preferred by fast swimmers.
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Simulation of flexible filaments in a uniform flow by the immersed boundary method
TL;DR: An improved version of the immersed boundary (IB) method is developed for simulating flexible filaments in a uniform flow and a repulsive force was included in the formulation to handle collisions between the free ends of side-by-side filaments undergoing out-of-phase flapping.
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.
References
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Journal ArticleDOI
Wing rotation and the aerodynamic basis of insect flight.
TL;DR: In this paper, the authors show that the enhanced aerodynamic performance of insects results from an interaction of three distinct yet interactive mechanisms: delayed stall, rotational circulation, and wake capture.
Wing rotation and the aerodynamic basis of insect flight
TL;DR: A comprehensive theory incorporating both translational and rotational mechanisms may explain the diverse patterns of wing motion displayed by different species of insects.
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Leading-edge vortices in insect flight
Charles P. Ellington,Coen van den Berg,Coen van den Berg,Alexander P. Willmott,Adrian L. R. Thomas,Adrian L. R. Thomas +5 more
TL;DR: In this article, the authors visualized the airflow around the wings of the hawkmoth Manduca sexta and a 'hovering' large mechanical model, and found an intense leading-edge vortex was found on the downstroke, of sufficient strength to explain the high-lift forces.
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Oscillating foils of high propulsive efficiency
TL;DR: In this article, the phase angle between transverse oscillation and angular motion is the critical parameter affecting the interaction of leading-edge and trailing-edge vorticity, as well as the efficiency of propulsion.
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Note on the swimming of slender fish
TL;DR: In this paper, the authors determine what transverse oscillatory movements a slender fish can make which will give it a high Froude propulsive efficiency, and the recommended procedure is for the fish to pass a wave down its body at a speed of around of the desired swimming speed, the amplitude increasing from zero over the front portion to a maximum at the tail, whose span should exceed a certain critical value.