Morphology and experimental hydrodynamics of fish fin control surfaces

  title={Morphology and experimental hydrodynamics of fish fin control surfaces},
  author={George V. Lauder and Eliot G. Drucker},
  journal={IEEE Journal of Oceanic Engineering},
Over the past 520 million years, the process of evolution has produced a diversity of nearly 25000 species of fish. This diversity includes thousands of different fin designs which are largely the product of natural selection for locomotor performance. Fish fins can be grouped into two major categories: median and paired fins. Fins are typically supported at their base by a series of segmentally arranged bony or cartilaginous elements, and fish have extensive muscular control over fin… 

Fish locomotion: kinematics and hydrodynamics of flexible foil-like fins

The fins of fishes are remarkable propulsive devices that appear at the origin of fishes about 500 million years ago and have been a key feature of fish evolutionary diversification. Most fish

Fin–fin interactions during locomotion in a simplified biomimetic fish model

This work presents a flexible fish-like robotic model that better represents the kinematics of swimming fishes while still being simple enough to examine a range of morphologies and motion patterns and creates statistical models that predict the individual effects of each kinematic and morphological variable.

Functional morphology of the fin rays of teleost fishes

This work examined the range of motion and curvatures of the pectoral fin rays of bluegill sunfish during steady swimming, turning maneuvers, and hovering behaviors and during a vortex perturbation impacting the fin during the fin beat, suggesting flexibility may offer intrinsic damping of environmental fluid perturbations encountered by swimming fish.

Control surfaces of aquatic vertebrates: active and passive design and function

How modifications to control surfaces can alter flow and increase hydrodynamic performance is reviewed to alter flow to increase lift, reduce drag and enhance thrust in the case of propulsive fin-based systems in fishes and marine mammals.

Hydrodynamics of median-fin interactions in fish-like locomotion: Effects of fin shape and movement

Improved understanding of MFI in fishlike swimming is improved and the benefits of optimal MFI for the design of high-performance bioinspired underwater vehicles are demonstrated.

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  • K. Low
  • Engineering
    Int. J. Humanoid Robotics
  • 2007
An undulating fin mechanism has been developed and used as the propulsion system of fish in various fin types and the layout and workspace of the modular fin segments are considered and analyzed.

Median fin function in bluegill sunfish Lepomis macrochirus: streamwise vortex structure during steady swimming

  • E. Tytell
  • Biology, Physics
    Journal of Experimental Biology
  • 2006
This study analyzes flow in the transverse plane at a range of positions around bluegill sunfish Lepomis macrochirus, from the trailing edges of the dorsal and anal fins to the near wake, and proposes a three-dimensional structure of the vortex wake in which vortices from the caudal notch are elongated by the dorso-ventral cupping motion of the tail.



Experimental Hydrodynamics and Evolution: Function of Median Fins in Ray-finned Fishes1

Two recent technical developments in DPIV methodology are summarized: high-resolution DPIV using a recursive local-correlation algorithm allows quantification of small vortices, while stereo-DPIV permits simultaneous measurement of x, y, and z flow velocity components within a single planar light sheet.

Function of pectoral fins in rainbow trout: behavioral repertoire and hydrodynamic forces

Despite its traditional categorization as a propulsor of limited functional importance, the salmoniform pectoral fin exhibits a diverse locomotor repertoire comparable to that of higher teleostean fishes.

Locomotion in sturgeon: function of the pectoral fins.

  • WilgaLauder
  • Biology
    The Journal of experimental biology
  • 1999
Three-dimensional kinematic analysis showed that during steady horizontal swimming the pectoral fins are oriented with a negative angle of attack predicted to generate no significant lift, and a new force balance for swimming sturgeon is proposed for steady swimming and vertical maneuvering.

Wake Dynamics and Locomotor Function in Fishes: Interpreting Evolutionary Patterns in Pectoral Fin Design1

It is found that the pectoral fins of sunfish generate significantly higher forces for turning and direct braking forces closer to the center of mass of the body than the pectoral fins of trout.

Pectoral Fin Locomotion in Fishes: Testing Drag-based Models Using Three-dimensional Kinematics

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Locomotor function of the dorsal fin in teleost fishes: experimental analysis of wake forces in sunfish.

Empirical evidence is presented that vortex structures generated by the soft dorsal fin upstream can constructively interact with those produced by the caudal fin downstream, and Reinforcement of circulation around the tail through interception of the dorsal fin's vortices is proposed as a mechanism for augmenting wake energy and enhancing thrust.

A hydrodynamic analysis of fish swimming speed: wake structure and locomotor force in slow and fast labriform swimmers.

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Performance limits of labriform propulsion and correlates with fin shape and motion.

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Ecomorphology of Locomotion in Labrid Fishes

The diversity of pectoral fin shape in 143 species of labrids from the Great Barrier Reef and the Caribbean appears to be related to a trade-off between efficiency of fast swimming and maneuverability in slow swimming species.