The effects of a longfin inshore squid's fins on propulsive efficiency during underwater swimming

Olcay, Ali Bahadır; Malazi, Mahdi Tabatabaei

doi:10.1016/j.oceaneng.2016.10.037

Cited by 12 publications

(9 citation statements)

References 17 publications

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“…The realizable k-ε turbulence model was applied for the turbulent flow simulation in the three-dimensional fluid domain (Olcay et al [28] and ANSYS Fluent Theory Guide [29]). The governing equations representing the continuity and momentum formulas as given below:…”

Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

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Three-Dimensional Fluid–Structure Interaction Case Study on Elastic Beam

Malazi

Eren

et al. 2020

JMSE

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A three-dimensional T-shaped flexible beam deformation was investigated using model experiments and numerical simulations. In the experiment, a beam was placed in a recirculating water channel with a steady uniform flow in the inlet. A high-speed camera system (HSC) was utilized to record the T-shaped flexible beam deformation in the cross-flow direction. In addition, a two-way fluid-structure interaction (FSI) numerical method was employed to simulate the deformation of the T-shaped flexible beam. A system coupling was used for conjoining the fluid and solid domain. The dynamic mesh method was used for recreating the mesh. After the validation of the three-dimensional numerical T-shaped flexible solid beam with the HSC results, deformation and stress were calculated for different Reynolds numbers. This study exhibited that the deformation of the T-shaped flexible beam increases by nearly 90% when the velocity is changed from 0.25 to 0.35 m/s, whereas deformation of the T-shaped flexible beam decreases by nearly 63% when the velocity is varied from 0.25 to 0.15 m/s.

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Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

“…When the body locates in fluid flow, it can experience a certain amount of drag force (Olcay et al [28], Batchelor [32], and Vasudev et al [33]). Drag force was given by = _ + _ = .…”

Section: Drag Coefficients Studymentioning

confidence: 99%

Three-Dimensional Fluid–Structure Interaction Case Study on Elastic Beam

Malazi

Eren

et al. 2020

JMSE

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“…A cylinder can experience hydrodynamic forces when it moves in a fluid (Olcay et al [26], Batchelor [31], and Vasudev et al [32]). Hydrodynamic forces on the cylinder can be computed by using:…”

Section: Hydrodynamic Forces and Validation Of A Moving Cylindermentioning

confidence: 99%

“…They used the SST k-w turbulence model for solving the fluid domain. Underwater locomotion of squid was investigated numerically by Olcay et al [26]. A 3-D model of squid was simulated by Ansys Fluent computational fluid dynamics software and also the realizable k-ε turbulence model was employed for simulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Collision between a Solitary Wave and a Moving Cylinder

Eren

Malazi

Temir

2020

Water

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A 2-D numerical wave tank (NWT) was applied for solving the interaction between a solitary wave and a moving circular cylinder. The cylinder was placed at various positions from the tank bed floor. The cylinder can move at a constant horizontal velocity towards the solitary wave. The collision between a solitary wave and a moving cylinder is investigated at various conditions. A total of fifteen cases were studied. Ten different numerical simulations were used, including five submergence depths and two different moving velocities. The other five different numerical simulations were studied when the cylinder was unmoved in the NWT for comparing wave-structure interaction results between the moving and unmoved cylinders. The numerical results were obtained by calculating Reynolds-Averaged Navier-Stokes (RANS) equations and the volume of fluid (VOF) equations. Two different codes (User-Define-Function-UDF) were used for the generation of a solitary wave by moving a wave paddle and traveling cylinder in the NWT. The dynamic mesh method was applied for recreating mesh. First, the ability of CFD codes to generate a solitary wave by using wave paddle movement and the hydrodynamic forces of a moving cylinder were validated by numerical results. Further, the free-surface elevation and hydrodynamic forces were considered at various conditions. The numerical results show that moving cylinder velocity and the space between the cylinder and the tank bed floor have significant effects on surface displacement and hydrodynamic forces.

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“…Little has been reported, however, on the progressive improvement of these swimming abilities during early ontogeny. In adults, the jet propulsive efficiency improves at higher SSs ( Anderson and Grosenbaugh, 2005 ) and fins have a fundamental role in generating thrust ( Anderson and Demont, 2005 ), stabilizing the body, and also providing net lift ( Stewart et al, 2010 ; Olcay and Malazi, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Development of Swimming Abilities in Squid Paralarvae: Behavioral and Ecological Implications for Dispersal

Vidal¹,

Zeidberg

Buskey

2018

Front. Physiol.

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This study investigates the development of swimming abilities and its relationship with morphology, growth, and nourishment of reared Doryteuthis opalescens paralarvae from hatching to 60 days of age. Paralarvae (2.5–11 mm mantle length – ML) were videotaped, and their behavior quantified throughout development using computerized motion analysis. Hatchlings swim dispersed maintaining large nearest neighbor distances (NND, 8.7 ML), with swimming speeds (SS) of 3–8 mm s-1 and paths with long horizontal displacements, resulting in high net to gross displacement ratios (NGDR). For 15-day-old paralarvae, swimming paths are more consistent between jets, growth of fins, length, and mass increases. The swimming pattern of 18-day-old paralarvae starved for 72 h exhibited a significant reduction in mean SS and inability to perform escape jets. A key morphological, behavioral, and ecological transition occurs at about 6 mm ML (>35-day old), when there is a clear change in body shape, swimming performance, and behavior, paths are more regularly repeated and directional swimming is evident, suggesting that morphological changes incur in swimming performance. These squid are able to perform sustained swimming and hover against a current at significantly closer NND (2.0 ML), as path displacement is reduced and maneuverability increases. As paralarvae reach 6–7 mm ML, they are able to attain speeds up to 562 mm s-1 and to form schools. Social feeding interactions (kleptoparasitism) are often observed prior to the formation of schools. Schools are always formed within areas of high flow gradient in the tanks and are dependent on squid size and current speed. Fin development is a requisite for synchronized and maneuverable swimming of schooling early juveniles. Although average speeds of paralarvae are within intermediate Reynolds numbers (Re < 100), they make the transition to the inertia-dominated realm during escape jets of high propulsion (Re > 3200), transitioning from plankton to nekton after their first month of life. The progressive development of swimming capabilities and social interactions enable juvenile squid to school, while also accelerates learning, orientation and cognition. These observations indicate that modeling of the lifecycle should include competency to exert influence over small currents and dispersal patterns after the first month of life.

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The effects of a longfin inshore squid's fins on propulsive efficiency during underwater swimming

Cited by 12 publications

References 17 publications

Three-Dimensional Fluid–Structure Interaction Case Study on Elastic Beam

Three-Dimensional Fluid–Structure Interaction Case Study on Elastic Beam

Numerical Investigation on the Collision between a Solitary Wave and a Moving Cylinder

Development of Swimming Abilities in Squid Paralarvae: Behavioral and Ecological Implications for Dispersal

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