Optimal strouhal number for swimming animals

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August undefined, 2024

WebWe present an analysis of efficient undulatory propulsion for slender animals swimming at high Reynolds number. Using Lighthill’s large-amplitude elongated-body theory, we show that optimally efficient swimming kinematics can be characterized through a single dimensionless variable 𝜓. 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 ...

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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 … 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. somers ny real estate mansion

Optimal Strouhal number for swimming animals - ScienceDirect

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 … WebJun 14, 2024 · Animals such as birds , ... Regarding Strouhal number influence, ... 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] Vuruskan, A.; Fenercioglu, I.; Cetiner, O. A study on forces acting on a flapping wing. 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 somers ny weather forecast

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WebDec 18, 2014 · The Strouhal number relates swimming speed U to the tail-beat frequency f and tail-beat amplitude (tip-to-tip excursion of the tail) A. This number can be thought of as an indicator for the... 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 … small cell carcinoma of left lung icd 10WebOptimal Strouhal number for swimming animals. EN. English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa … small cell cancer of the lung

"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 … " - Optimal strouhal number for swimming animals

Optimal strouhal number for swimming animals

Efficient cruising for swimming and flying animals is dictated …

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 … 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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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 … 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 …

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 … 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....

WebOct 23, 2024 · Of all the behaviors performed by animals in our dataset, transiting is most similar to the steady-state swimming performed by animals in controlled, laboratory and aquarium studies (Bainbridge, 1958; Fish and Rohr, 1999; Fish et al., 2014). This could explain why the Strouhal number for this individual fell so close to the theoretical optimum. 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.

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

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 ... somerson lyricsWeboptimal 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- somers ny restaurantsWebOct 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 … somers of alaskaWebDec 15, 2024 · Strouhal numbers for swimming penguins have been estimated to be within the range considered as optimal from the viewpoint of propulsive efficiency. Additionally, … somers ortho fishkillWebThe 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 ... somer solctice 2012 what day of the weekWebOptimal Strouhal number for swimming animals Eloy, Christophe To evaluate the swimming performances of aquatic animals, an important dimensionless quantity is the Strouhal … somers once upon a childWebOptimal Strouhal number for swimming animals. EN. English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa Indonesia Türkçe Suomi Latvian Lithuanian česk ... somers orthopaedic