Higher order hydrodynamic interaction between two slender bodies in potential flow

Kadri, Usama; Weihs, D.

doi:10.1007/s00773-014-0275-0

Cited by 9 publications

(6 citation statements)

References 24 publications

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“…In this respect, a diamond-shaped swimming pattern is optimal in terms of energy saving which supports previous findings by [8]. Such mode might be observed in schools migrating in "safe" zones, or in large fish or mammals, e.g., dolphins [1,10], that use the saved energy for extra thrust during escape. However, smaller fish count on their manoeuvrability for survival, which increases with the total hydrodynamic forces [16,17].…”

Section: Hydrodynamic Modelsupporting

confidence: 86%

“…The model by [8] accurately predicts diamond-shape pattern modes especially for relatively large fish or dolphins [1,10], and for different types of fish preferred orientations might be identified. However, for smaller fish (e.g., Jack Caranx sp., 60 cm) the school pattern shapes were found to be random; especially when fish encounter a danger (e.g., due to the presence and sudden movement of scuba-divers) their behaviour becomes more disordered within the school; at any given instant the relative distances and angles between neighbouring fish fail to form ordered patterns, as we observed (fig.…”

Section: Hydrodynamic Modelmentioning

confidence: 83%

“…-The concurrent movement of fish in a school involves significant hydrodynamic interactions. The relative longitudinal and lateral distances and velocities between the fish, as well as their relative lengths and cross-sectional areas determine the magnitude of the hydrodynamic forces and moments involved [1][2][3], which, in turn, could affect the school overall manoeuvrability [4]. It is not the aim of the current study to discuss how information due to a sudden movement is (physiologically) transferred among the school members in terms of sensory systems [5], environmental effects [6], or aerobic capacity [7].…”

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confidence: 99%

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Random patterns in fish schooling enhance alertness: A hydrodynamic perspective

Kadri

Brümmer

Kadri

2016

EPL

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One of the most highly debated questions in the field of animal swarming and social behaviour, is the collective random patterns and chaotic behaviour formed by some animal species, in particular if there is a danger. Is such a behaviour beneficial or unfavourable for survival? Here we report on one of the most remarkable forms of animal swarming and social behaviour -fish schooling -from a hydrodynamic point of view. We found that some fish species do not have preferred orientation and they swarm in a random pattern mode, despite the excess of energy consumed. Our analyses, which includes calculations of the hydrodynamic forces between slender bodies, show that such a behaviour enhances the transfer of hydrodynamic information, and thus enhances the survivability of the school. These findings support the general hypothesis that a disordered and non-trivial collective behaviour of individuals within a nonlinear dynamical system is essential for optimising transfer of information -an optimisation that might be crucial for survival.

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Section: Hydrodynamic Modelsupporting

confidence: 86%

Section: Hydrodynamic Modelmentioning

confidence: 83%

mentioning

confidence: 99%

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Random patterns in fish schooling enhance alertness: A hydrodynamic perspective

Kadri

Brümmer

Kadri

2016

EPL

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“…The available positions describe the selected aspects of ships interaction in selected conditions. Kadri and Weihs [14] modelled hydrodynamic interactions between two slender bodies of revolution moving in close proximity, in an unbounded, inviscid, and incompressible fluid. Von Graefe et al [35] introduced the nonlinear steady flow method that accounts for the nonlinear free-surface conditions, ship wave, and dynamic trim and sinkage.…”

Section: State Of the Art Analysismentioning

confidence: 99%

Ships speed limitations for reliable maintenance of the quay walls of navigation channels in ports

Paulauskas¹,

Filina-Dawidowicz²,

Paulauskas³

2020

Eksploatacja i Niezawodność – Maintenance and Reliability

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ShipS Speed limitationS for reliable maintenance of the quay wallS of navigation channelS in portS ograniczenia prędkości Statków do niezawodnego utrzymania ścian nabrzeży zlokalizowanych przy kanałach nawigacyjnych w portachThere is a number of ports where approach or inside navigation channels are located close to the quay walls. In difficult hydrometeorological conditions appropriate speed of ship is needed to keep proper ship's steering while passing through channel. The ships that pass near the quay walls with high speed create high interaction forces on moored ships and negatively interact on their mooring equipment and quay walls. Ports should ensure relevant maintenance and reliability of quay walls and ships' mooring equipment. That is why investigation of the ships interaction forces during ship passing near the ships moored to quay walls is very important to find limitations of the passing ship speed depending on passing ship's parameters, distances and environmental conditions to provide reliable maintenance of navigation channel. In the article the conditions of dynamic forces caused by passing ships are investigated, including possible external forces influencing on moored ships, mooring equipment and quay walls.The methodology to assess the forces exerted on ship moored to quay wall by ship passing close to them is created. On the basis of the case study analysis results, the recommendations for the limitations to ships passing near the ships moored to quay walls were proposed that will allow providing relevant maintenance and reliability of navigation channel and its infrastructure.

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“…As such, the hydrodynamic interaction effects between submerged vehicles have not been extensively investigated experimentally, with the exception of Molland and Utama (2002). Nevertheless, some parallels can be drawn from numerical and experimental studies on the hydrodynamic interactions between surface ships, deducing that the interaction effects will depend on the: relative size between the submerged vessels, lateral separation distance, longitudinal relative positions, vessel speeds, hull shapes, submerged depths, and water depth (Taylor, 1909;Newman, 1965;Remery, 1974;Krishnankutty and Varyani, 2004;Kriebel, 2007;Lataire et al, 2009;Kadri and Weihs, 2014;Jayarathne et al, 2014).…”

Section: Introductionmentioning

confidence: 97%