Vortex mechanics associated with propulsion and control in whales and dolphins

Fish, Frank E.; Legac, Paul; Wei, Tao; Williams, Terrie M.

doi:10.1016/j.cbpa.2008.04.077

Cited by 4 publications

(7 citation statements)

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“…Recent technological advancements in the field of material science and engineering have made the dream of mimicking nature a reality [10][11][12]. Due to its huge importance, research in the field of biomimetics is gaining popularity.…”

Section: Biomimeticsmentioning

confidence: 99%

“…Humpback whales feed on plankton, and fish schools of euphausiids, herring, and capelin [17]. The most amazing feature of the humpback is its acrobatic behaviour during feeding known as bubble netting, which involves creating a zone around the prey and then sudden lunging towards it, giving the whale an element of surprise [11,18]. Due to the presence of the tubercles on the flippers, the whale has a minimum turning diameter of 14.8 m (Fig.…”

Section: Humpback Whalementioning

confidence: 99%

“…He started the initial research and subsequently published numerous research articles on this topic [11,12,15,20,[23][24][25][26][27][28][29][30]. Watts and Fish patented this technology, and started a company named 'Whale Power', which develops wind turbine blades.…”

Section: Humpback Whalementioning

confidence: 99%

See 2 more Smart Citations

Mimicking the humpback whale: An aerodynamic perspective

Aftab

Razak

Rafie

et al. 2016

Progress in Aerospace Sciences

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Section: Biomimeticsmentioning

confidence: 99%

Section: Humpback Whalementioning

confidence: 99%

See 1 more Smart Citation

Mimicking the humpback whale: An aerodynamic perspective

Aftab

Razak

Rafie

et al. 2016

Progress in Aerospace Sciences

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“…The field of biomimetics was initially not of great importance due to various structural and design constraints in integrating the mechanical system with the biomimetic feature. However, technological advancements in the fields of structural design and material sciences have paved a new road towards the successful integration of mechanical and biological systems (Fish, 2006; Fish et al , 2008).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of humpback whale inspired tubercles on swept wings

Joseph

Sathyabhama

Sridhar

2022

AEAT

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Purpose With aims to increase the aerodynamic efficiency of aerodynamic surfaces, study on flow control over these surfaces has gained importance. With the addition of flow control devices such as synthetic jets and vortex generators, the flow characteristics can be modified over the surface and, at the same time, enhance the performance of the body. One such flow control device is the tubercle. Inspired by the humpback whale’s flippers, these leading-edge serrations have improved the aerodynamic efficiency and the lift characteristics of airfoils and wings. This paper aims to discusses in detail the flow physics associated with tubercles and their effect on swept wings. Design/methodology/approach This study involves a series of experimental and numerical analyses that have been performed on four different wing configurations, with four different sweep angles corresponding to 0°, 10°, 20° and 30° at a low Reynolds number corresponding to Rec=100,000. Findings Results indicate that the effect of tubercles diminishes with an increase in wing sweep. A significant performance enhancement was observed in the stall and post-stall regions. The addition of tubercles led to a smooth post-stall lift characteristic compared to the sudden loss in the lift with regular wings. Among the four different wings under observation, it was found that tubercles were most effective on the 0° configuration (no sweep), showing a 10.8% increment in maximum lift and a 38.5% increase in the average lift generated in the post-stall region. Tubercles were least effective on 30° configuration. Furthermore, with an increase in wing sweep, co-rotating vortices were distinctly observed rather than counter-rotating vortices. Originality/value While extensive numerical and experimental studies have been performed on straight wings with tubercles, studies on the tubercle effect on swept wings at low Reynolds number are minimal and mainly experimental in nature. This study uses numerical methods to explore the complex flow physics associated with tubercles and their implementation on swept wings. This study can be used as an introductory study to implement passive flow control devices in the low Reynolds number regime.

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“…The successful bionic applications into mechanical systems have drawn numerous attention and inspiration from the researchers and engineers. Currently scientific and technological progress in various fields has made the dream of mimicking nature from a challenge to a reality (Choi, 2009;Fish, 2006;Fish et al, 2008). Because of its significant potential, explorations in the field of biomimetics have being obtained great popularity.…”

Section: Introductionmentioning

confidence: 99%

An aerodynamic optimization design study on the bio-inspired airfoil with leading-edge tubercles

Chang

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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The aim of the paper is to propose a groundbreaking method for the aerodynamic optimization design of the bioinspired wing with leading-edge tubercles. An emphasis on the optimization design of the spanwise waviness in the leading edge for delaying stall and increasing lift from the aerodynamic performance perspective has been laid in this study. For the conversion of the wavy configuration, the form parameterized approach using F-spline curves has been used to produce more variants of the leading-edge tubercles. Numerical investigations of flow characteristics which are performed using CFD computations have been used to validate the numerical scheme with experimental data. The combination of Non-dominated Sorting Genetic Algorithm II and Response Surface Method based Kriging Model has been adopted as the aerodynamic optimization strategy. As consequence, the three main components of the optimization process are incorporated into the establishment of the aerodynamic optimization design system for the bio-inspired airfoil with leading-edge tubercles. The four optimal airfoils respectively which increases the stall angle as well as the lift have been obtained in contrast to the smooth wing. The optimized bio-inspired design of this kind can be applied to flow-controlled devices for improving the efficiency of a particular operating mechanism.

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Vortex mechanics associated with propulsion and control in whales and dolphins

Cited by 4 publications

References 0 publications

Mimicking the humpback whale: An aerodynamic perspective

Mimicking the humpback whale: An aerodynamic perspective

Experimental and numerical analysis of humpback whale inspired tubercles on swept wings

An aerodynamic optimization design study on the bio-inspired airfoil with leading-edge tubercles

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