Optimal strouhal number for swimming animals

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August undefined, 2024

WebUsing Lighthill’s elongated-body theory to address undulatory propulsion, it is demonstrated here that the optimal Strouhal number increases from 0.15 to 0.8 for animals spanning … WebOct 28, 2024 · Propulsion performance of swimming and flying animals is often evaluated by using dimensionless numbers, such as the Strouhal and Reynolds numbers. They have …

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Web× Close. The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. Webattack. The Strouhal number is deﬁ ned as St = f·A/u, where A denotes the characteristic width, f the frequency of movement, and u the velocity of the foil. They presented wake patterns as a function of the angle of attack and the Strouhal number [4]. In 2002, Lauder et al. studied hydrodynamics of ﬁ sh swimming with digital particle image ... raymer electric - winter park fl

Optimal Strouhal number for swimming animals - ScienceDirect

WebThe Strouhal number reflects the difficulty for animals to travel efficiently through a fluid with their cyclic propelling motions. The number relates to propulsive efficiency, which … WebOct 28, 2024 · Propulsion performance of swimming and flying animals is often evaluated by using dimensionless numbers, such as the Strouhal and Reynolds numbers. They have been shown to allow a better... WebFeb 1, 2011 · The results indicate that the kinematics of the propulsive flukes of odontocete cetaceans are not solely dependent on Strou Hal number, and the Strouhal number range … raymer elementary school

Self-similar kinematics among efficient slender swimmers

WebApr 15, 2004 · SUMMARY. Swimming efficiencies of fish and cetaceans have been related to a certain synchrony between stroke cycle frequency, peak-to-peak tail/fluke amplitude and mean swimming speed. These kinematic parameters form a non-dimensional wake parameter, referred to as a Strouhal number, which for the range between 0.20 and 0.40 … WebOct 16, 2003 · This seems to be true for dolphins 2, 3, 4, 5, sharks 3, 4, 5 and bony fish 3, 4, 5, which swim at 0.2 < St < 0.4. Here we show that birds, bats and insects also converge on … ray mercer tyresWebOptimal Strouhal number for swimming animals Eloy, Christophe To evaluate the swimming performances of aquatic animals, an important dimensionless quantity is the Strouhal … simplicity 6271

"WebUsing Lighthill's elongated-body theory to address undulatory propulsion, it is demonstrated here that the optimal Strouhal number increases from 0.15 to 0.8 for animals spanning … " - Optimal strouhal number for swimming animals

Optimal strouhal number for swimming animals

WebJul 7, 2024 · Eloy C. Optimal Strouhal number for swimming animals. Journal of Fluids and Structures, 2012, 30, 205–218. Article Google Scholar Download references Acknowledgment This study was funded by the National Natural Science Foundation of China (No. 51275127). Author information Authors and Affiliations WebThe vortex flow pattern and high propulsive efficiency of 89% were associated with Strouhal numbers within the optimal range (0.2–0.4) for rays swimming at routine and high speeds. ... R.L.; Thomas, A.L.R. Flying and swimming animals cruise at a Strouhal number tuned for high power efficiency. Nature 2003, 425, 707–711. [Google Scholar ...

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Webargued that animals likely evolved to swim in the same narrow interval. Using Lighthill’s elongated-body theory to address undulatory propulsion, it is demonstrated here that the … WebAug 7, 2024 · Abstract. Many swimming and flying animals are observed to cruise in a narrow range of Strouhal numbers, where the Strouhal number [Formula: see text] is a …

Webthat the Strouhal number for peak efﬁciency is largely determined by ﬂuid drag on the ﬁns and wings. swimming jﬂight jbiolocomotion jdrag S wimming and ﬂying animals across many species and scales cruise in a relatively narrow range of Strouhal numbers 0:2<0:4 (1, 2). The Strouhal number St =2fA=U is a WebApr 11, 2024 · Moreover, for a constant swimming speed and flapping frequency, up to certain limit, even with the change in amplitude swimming penguins offer Strouhal number within the recommended range of higher propulsive efficiency i.e., 0.2 < St < 0.4. ... Eloy C (2012) Optimal Strouhal number for swimming animals. J Fluids Struct 30:205–218

WebApr 1, 2012 · Using Lighthill's elongated-body theory to address undulatory propulsion, it is demonstrated here that the optimal Strouhal number increases from 0.15 to 0.8 for … Weboptimal Strouhal number increases from 0:15 to 0:8 for animals spanning from the largest cetaceans to the smallest tadpoles. To assess the validity of this model, the swimming kine-

WebTo evaluate the swimming performances of aquatic animals, an important dimensionless quantity is the Strouhal number, St = f A / U, with f the tail-beat frequency, A the peak-to-p

WebDec 15, 2024 · We start with the Strouhal number St, and as apparent from Eq. 1, its estimate is realistic only when the animal does not accelerate or decelerate significantly, a transportation mode usually referred to as cruising and defined as the propulsion phase when wingbeat frequency f, forward speed U and wingbeat amplitude A are fairly constant ... raymer family dog trainingWebIn this work, an optimal Strouhal number will be calculated for swimming animals without explicit reference to the stability or the dynamics of their wakes. First, Lighthill’s large … raymer elementary toledoWebFeb 1, 2011 · Optimal Strouhal number for swimming animals Christophe Eloy To evaluate the swimming performances of aquatic animals, an important dimensionless quantity is … raymer furniture raymere reclining sofaWebMar 6, 2024 · The Strouhal number reflects the difficulty for animals to travel efficiently through a fluid with their cyclic propelling motions. The number relates to propulsive efficiency, which peaks between 70-80% when within the optimal Strouhal number range of … raymer elementary toledo ohioWebTo evaluate the swimming performances of aquatic animals, an important dimensionless quantity is the Strouhal number, St = fA/U, with f the tail-beat... Skip to main content Due … raymere sofaWebFeb 26, 2024 · With different amplitude, the Strouhal number varies from 0.11 to 1.1, and the 3D wake structures visualized by the instantaneous isosurfaces of the λ 2 criterion are shown in Figure 9. In Figure 9(a), the Strouhal number is 0.11, but the wake pattern is featured as a double-row wake. At the beginning, the vortex is attached to the fish ... simplicity 6290