Optimal strouhal number for swimming animals

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August undefined, 2024

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- 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...

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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 … 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. i messages therapist aid

Efficient cruising for swimming and flying animals is dictated …

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.... 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 … i messages therapy

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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. 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 imessage stop showing message previewWebFeb 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 ... imessage stopped working on mac

"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. " - Optimal strouhal number for swimming animals

Optimal strouhal number for swimming animals

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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 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 …

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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 WebOptimal 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 ...

WebFeb 1, 2011 · Optimal Strouhal number for swimming animals Christophe Eloy To evaluate the swimming performances of aquatic animals, an important dimensionless quantity is … 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 ...

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 ... 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 …

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 …

WebDec 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, … imessage strikethroughWebJul 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 imessage still verifying my phone numberWebApr 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 … list of olympics wikiWebOct 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. imessages to windows 11WebSep 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 … imessages troubleshootingWebOptimal Strouhal number for swimming animals Eloy, Christophe To evaluate the swimming performances of aquatic animals, an important dimensionless quantity is the Strouhal … list of olympic winter gamesWebJun 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. imessages to computer