Experimental study on wake flows of a live fish with time-resolved tomographic PIV and pressure reconstruction

Tu, Han Yen; Wang, Fujun; Wang, Hongping; Gao, Qi; Wei, Runjie

doi:10.1007/s00348-021-03378-2

Cited by 16 publications

(10 citation statements)

References 60 publications

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“…Tomographic PIV is based on tomographic reconstruction with four cameras. In the tomographic PIV system, four cameras are placed around the experimental setup [ 180 ]. Due to the multi camera arrangement, flow structures and particle distribution can be obtained in three dimensional easily.…”

Section: Methodsmentioning

confidence: 99%

Past and current components-based detailing of particle image velocimetry: A comprehensive review

Rohács¹,

Yasar²,

Kale³

et al. 2023

Heliyon

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Section: Methodsmentioning

confidence: 99%

Past and current components-based detailing of particle image velocimetry: A comprehensive review

Rohács¹,

Yasar²,

Kale³

et al. 2023

Heliyon

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“…We solve the pressure field based on the PIV velocity field , (Figure ). Compared with the forces acting on the WS, the pressure field shows that the added mass force of the WS is dominant during the rising process.…”

Section: Resultsmentioning

confidence: 99%

Spontaneous Rising of a Whirling-Swimmer Driven by a Bubble

Dai

et al. 2023

Langmuir

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The wind-dispersed seeds can rotate and fall like small vehicles with the help of the wind to obtain a longer propagation distance. Inspired by this, we propose a novel bubble-driven three-bladed whirling-swimmer (WS) to travel in the fluid as a vehicle. Four types of WSs with blade folding angles (φ) ranging from 10 to 60° were designed, and their swimming performance was evaluated. Regardless of the WS shape, the velocity increases linearly with φ, while the angular frequency exhibits an asymptotic value. Further, both the St and rotational energy of the WS peak at 20° ≤ φ ≤ 30° for different WS shapes as well as the vertical force and the hydrodynamic torque were solved from a proposed mechanics model. This folding angle range is unexpectedly consistent with the coning angle during maple samaras’ stable falling. The WS lift and drag forces greatly depend on the interaction between the leading-edge vortex and the hub vortex. The results showed that the WS-IV seems to have the highest performance. Our work may shed new light on developing unpowered wireless swimmers of high swimming performance to provide a new way for underwater information collection, information transmission, and enhanced mixing.

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“…also reported the presence of a prominent vortical structure behind the tips of the crayfish tail during the abdominal closure and tail flip 6 . This chain of vortices in the wake is reminiscent in structure to the vortex street formed by undulating fish 51 – 53 . In contrast to these fish wake studies in which the jet flow moves in the direction opposite of the animal motion, the jet flow in the wake of the krill caridoid escape maneuver is in the direction of the animal motion.…”

Section: Discussionmentioning

confidence: 97%

Hydrodynamics of the fast-start caridoid escape response in Antarctic krill, Euphausia superba

Connor

Webster

2023

Sci Rep

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Krill are shrimp-like crustaceans with a high degree of mobility and variety of documented swimming behaviors. The caridoid escape response, a fast-start mechanism unique to crustaceans, occurs when the animal performs a series of rapid abdominal flexions and tail flipping that results in powerful backward strokes. The current results quantify the animal kinematics and three-dimensional flow field around a free-swimming Euphausia superba as it performs the caridoid escape maneuver. The specimen performs a single abdominal flexion-tail flip combination that leads to an acceleration over a 42 ms interval allowing it to reach a maximum speed of 57.0 cm/s (17.3 body lengths/s). The krill’s tail flipping during the abdominal closure is a significant contributor to the thrust generation during the maneuver. The krill sheds a complex chain of vortex rings in its wake due to the viscous flow effects while the organism accelerates. The vortex ring structure reveals a strong suction flow in the wake, which suggests that the pressure distribution and form drag play a role in the force balance for this maneuver. Antarctic krill typically swim in a low to intermediate Reynolds number (Re) regime where viscous forces are significant, but as shown by this analysis, its high maneuverability allows it to quickly change its body angle and swimming speed.

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Experimental study on wake flows of a live fish with time-resolved tomographic PIV and pressure reconstruction

Cited by 16 publications

References 60 publications

Past and current components-based detailing of particle image velocimetry: A comprehensive review

Past and current components-based detailing of particle image velocimetry: A comprehensive review

Spontaneous Rising of a Whirling-Swimmer Driven by a Bubble

Hydrodynamics of the fast-start caridoid escape response in Antarctic krill, Euphausia superba

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