Self-propelled swimming of a flexible plunging foil near a solid wall

Dai, Longzhen; He, Guowei; Zhang, Xing

doi:10.1088/1748-3190/11/4/046005

Cited by 41 publications

(41 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some of the previous studies observed the increased power input when operating near the ground (Quinn et al 2014a;Dai et al 2016;Tang et al 2016;Park et al 2017). The body kinematics was one of the key parameters in determining the thrust and the power input (Park et al 2017).…”

Section: Fish Swimming Near the Groundmentioning

confidence: 98%

“…In the numerical study performed by Ryu et al (2016), a tethered flexible fin with a transverse heaving motion produced an enhanced thrust near the ground. Several studies adopted a self-propelled system to study the ground effect, where the swimming speed and the body kinematics are dynamically coupled (Dai et al 2016;Tang et al 2016;Park et al 2017). Dai et al (2016) and Park et al (2017) modelled a twodimensional (2D) flexible fin swimming near the ground, and the swimming speed increased with the cost of increasing input power.…”

Section: Fish Swimming Near the Groundmentioning

confidence: 99%

“…Several studies adopted a self-propelled system to study the ground effect, where the swimming speed and the body kinematics are dynamically coupled (Dai et al 2016;Tang et al 2016;Park et al 2017). Dai et al (2016) and Park et al (2017) modelled a twodimensional (2D) flexible fin swimming near the ground, and the swimming speed increased with the cost of increasing input power. Tang et al (2016) defined the expensive, benefited, and uninfluenced regimes for a self-propelled flexible plate near the ground.…”

Section: Fish Swimming Near the Groundmentioning

confidence: 99%

“…The flapping motion of a wing or a propulsor near the ground provided the hydrodynamic benefits of the increased thrust (Quinn et al 2014a;Ryu et al 2016;Dai et al 2016;Park et al 2017), or the enhanced propulsive efficiency (Quinn et al 2014b;Park et al 2017). Some of the previous studies observed the increased power input when operating near the ground (Quinn et al 2014a;Dai et al 2016;Tang et al 2016;Park et al 2017).…”

Section: Fish Swimming Near the Groundmentioning

confidence: 99%

“…Motivated by many animals swimming near the ground, Sung Goon PARK* and Hyung Jin SUNG* *Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea E-mail: hjsung@kaist.ac.kr Park and Sung, Mechanical Engineering Reviews, Vol.5, No.1 (2018) [DOI: 10.1299/mer. many researchers have performed experimental (Blevins and Lauder 2013;Quinn et al 2014aQuinn et al , 2014bFernandez-prats et al 2015;Bleishwitz et al 2016) and numerical (Dai et al 2016;Ryu et al 2016;Tang et al 2016;Park et al 2017) studies on the ground effect, and observed the hydrodynamic advantages such as increments of cruising speed, thrust and propulsive efficiency depending on the body motion of a swimmer. Fish can benefit from swimming in the wake of an inanimate structure as well as swimming near the ground.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Hydrodynamics of a self-propelled flexible fin in perturbed flows

Saleel

Sung

2018

Mechanical Engineering Reviews

View full text Add to dashboard Cite

A self-propelled flexible fin is subjected to perturbed flows produced by inanimate structures or other moving organisms. An optimal flapping motion in unbounded fluids may not be optimal in perturbed flows. The goal of this paper is to review key studies that focused on the hydrodynamics of fish swimming in perturbed flows, and to reveal the mechanisms by which fish can exploit energy from the surrounding fluid by modelling a selfpropelled flexible fin. A heaving motion was prescribed on the leading edge of the fin, and other posterior parts passively adapted to the surrounding fluid as a result of the fluid-flexible-body interaction. We consider three flow environments in this paper; i) near the ground, ii) behind a cylinder, and iii) in the wake of another moving fin. The self-propelled fin modeled here can generate more thrust with a smaller penalty of increased power input, leading to increased propulsive efficiency by flapping near the ground. For the same heaving motion, the self-propelled fin near the ground can swim faster than that moving far from the ground. The fins swimming in the wake of a circular cylinder can maintain the relative positions to the upstream cylinder without using any power input by adjusting their heaving frequency as the vortex shedding frequency, and by slaloming between the oncoming vortices. Two tandem self-propelled fins with an identical heaving motion form a stable configuration spontaneously, and the power input is reduced for the following fin by passing through the oncoming vortex centers. A Karman vortex street is generated in the wake of the cylinder, while a reverse Karman vortex street is formed behind a self-propelled fin. The optimal trajectories for the fins swimming in a Karman and reverse Karman vortex streets are observed in the vortex slaloming and interception modes, respectively, where the heaving motion is in-phase with the induced flow direction in the spanwise direction. The synchronization enables the fins to save the energy required in the swimming behaviors.

show abstract