Optimal strouhal number for swimming animals

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August undefined, 2024

WebJun 18, 2024 · While the exact Strouhal number giving peak propulsive efficiency depends on the relative amplitude and phase of the rotational pitch and translational heave components of flapping, its optimum typically falls in the range 0.2 < St< 0.4 for most natural combinations of pitch and heave. 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 …

Optimal Strouhal number for swimming animals - ScienceDirect

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 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 fly high elementary

Optimal Strouhal number for swimming animals

WebTo 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 … 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 … 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 … flyhigher

Optimal Strouhal number for swimming animals - irphe.fr

WebIn 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 … 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 ... flyhighenglish eduWebFeb 1, 2011 · Optimal Strouhal number for swimming animals Christophe Eloy To evaluate the swimming performances of aquatic animals, an important dimensionless quantity is … fly high english

"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... " - Optimal strouhal number for swimming animals

Optimal strouhal number for swimming animals

WebApr 12, 2024 · In nature, jellyfish are one of the most energy-efficient underwater animals due to their locomotion modes, i.e., jet-based or paddling-based swimming ().Moreover, how jellyfish swim combines effective fluidic propulsion and object manipulation, which is beneficial for predation (8, 12, 13).Furthermore, their deformable soft body structure … WebFeb 8, 2013 · Eloy, C. 2012 Optimal Strouhal number for swimming animals. J. Fluids Struct. 30, 205 – 218. CrossRef Google Scholar Fish, F. E. 2006 The myth and reality of grey’s paradox: implication of dolphin drag reduction for technology. Bioinspir. Biomim. 1, R17 – R25. CrossRef Google Scholar Fish, F. E. & Hui, C. A. 1991 Dolphin swimming – a review.

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WebOct 16, 2003 · A dimensionless parameter that describes the tail or wing kinematics of swimming and flying animals is the Strouhal number 1, St = fA / U, which divides stroke frequency ( f) and amplitude ( A) by ...

WebFeb 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 ... 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 ...

WebJun 29, 2024 · Specifically, for swimming and flying animals, the Strouhal number is defined as St=f / U*A, where f is the oscillation frequency, U is the flow rate, and A is the oscillation amplitude.... 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 …

WebMar 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 …

WebJun 18, 2024 · Many swimming and flying animals are observed to cruise in a narrow range of Strouhal numbers, where the Strouhal number St = 2fA / U is a dimensionless … green leather power lift chairWebApr 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 … fly high elmWebUsing 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 … flyhigh dressesWebOptimal Strouhal number for swimming animals. EN. English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa … fly high english translationWebSep 30, 2005 · Abstract: To evaluate the swimming performances of aquatic animals, an important dimensionless quantity is the Strouhal number, St = fA / U , with f the tail-beat frequency, A the peak-to-peak tail amplitude, and U the swimming velocity. Experiments with flapping foils have exhibited maximum propulsive efficiency in the interval 0.25 St 0.35 … green leather recliner chair saleWebUsing 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 … green leather pumps for womenWeb× 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. green leather recliner integrated