The estimation of pressure on the surface of a flapping rigid plate by stereo PIV

Suryadi, Alexandre; Obi, Shinnosuke

doi:10.1007/s00348-011-1150-y

Cited by 10 publications

(11 citation statements)

References 15 publications

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“…Bending kinematics in particular have been shown to greatly enhance vorticity and along with that, negative pressure 11,16,17 . Rigid, non-bending paddles generate different hydrodynamic structures than we observed 13,14 and do not generate strong negative pressure fields [16][17][18][19] . Therefore, the kinematics of bending appear to be important for generating strong negative pressure fields around moving propulsors.…”

Section: Discussionmentioning

confidence: 48%

The role of suction thrust in the metachronal paddles of swimming invertebrates

Colin

Costello

Sutherland

et al. 2020

Sci Rep

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An abundance of swimming animals have converged upon a common swimming strategy using multiple propulsors coordinated as metachronal waves. The shared kinematics suggest that even morphologically and systematically diverse animals use similar fluid dynamic relationships to generate swimming thrust. We quantified the kinematics and hydrodynamics of a diverse group of small swimming animals who use multiple propulsors, e.g. limbs or ctenes, which move with antiplectic metachronal waves to generate thrust. Here we show that even at these relatively small scales the bending movements of limbs and ctenes conform to the patterns observed for much larger swimming animals. We show that, like other swimming animals, the propulsors of these metachronal swimmers rely on generating negative pressure along their surfaces to generate forward thrust (i.e., suction thrust). Relying on negative pressure, as opposed to high pushing pressure, facilitates metachronal waves and enables these swimmers to exploit readily produced hydrodynamic structures. Understanding the role of negative pressure fields in metachronal swimmers may provide clues about the hydrodynamic traits shared by swimming and flying animals.

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Section: Discussionmentioning

confidence: 48%

The role of suction thrust in the metachronal paddles of swimming invertebrates

Colin

Costello

Sutherland

et al. 2020

Sci Rep

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“…We performed volumetric three-components PTV measurements using the V3V-9800 system (TSI Incorporated, 500 Cardigan Road, Shoreview, Minnesota 55126 USA), which is well characterized in [ 117 ]. This method presents the advantage of capturing the full unsteady flow field in a single recording of the whole 3D domain, and thus is preferable to more arduous implementations of scanning stereo-PIV [ 63 , 95 , 118 ], where a large number of measurement planes is required to reconstruct the whole volumetric flow field, or tomographic PIV, where the whole volume needs to be scanned with a light sheet for each particle position field, which is challenging with a flexible membrane deforming rapidly in the flow [ 66 , 119 ].…”

Section: Methodsmentioning

confidence: 99%

Hydrodynamic stress maps on the surface of a flexible fin-like foil

Dagenais

Aegerter

2021

PLoS ONE

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We determine the time dependence of pressure and shear stress distributions on the surface of a pitching and deforming hydrofoil from measurements of the three dimensional flow field. Period-averaged stress maps are obtained both in the presence and absence of steady flow around the foil. The velocity vector field is determined via volumetric three-component particle tracking velocimetry and subsequently inserted into the Navier-Stokes equation to calculate the total hydrodynamic stress tensor. In addition, we also present a careful error analysis of such measurements, showing that local evaluations of stress distributions are possible. The consistency of the force time-dependence is verified using a control volume analysis. The flapping foil used in the experiments is designed to allow comparison with a small trapezoidal fish fin, in terms of the scaling laws that govern the oscillatory flow regime. As a complementary approach, unsteady Euler-Bernoulli beam theory is employed to derive instantaneous transversal force distributions on the flexible hydrofoil from its deflection and the results are compared to the spatial distributions of hydrodynamic stresses obtained from the fluid velocity field.

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“…We performed volumetric threecomponents PTV measurements using the V3V-9800 system (TSI Incorporated, 500 Cardigan Road, Shoreview, Minnesota 55126 USA), which is well characterized in [102]. This method presents the advantage of capturing the full unsteady flow field in a single recording of the whole 3D domain, and thus is preferable to more arduous implementations of scanning stereo-PIV [62,90,103], where a large number of measurement planes is required to reconstruct the whole volumetric flow field, or tomographic PIV which typically restricts the measurement region to a thin layer of only a few millimeters [104].…”

Section: Volumetric Particle Tracking Velocimetrymentioning

confidence: 99%

Hydrodynamic stress maps on the surface of a flexible fin-like foil

Dagenais¹,

Aegerter²

2019

Preprint

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We determine the time dependence of pressure and shear stress distributions on the surface of a pitching and deforming hydrofoil from measurements of the three dimensional flow field. Period-averaged stress maps are obtained both in the presence and absence of steady flow around the foil. The velocity vector field is determined via volumetric three-component particle tracking velocimetry and subsequently inserted into the Navier-Stokes equation to calculate the total hydrodynamic stress tensor. In addition, we also present a careful error analysis of such measurements, showing that local evaluations of stress distributions are possible. The flapping foil used in the experiments is designed to allow comparison with a small trapezoidal fish fin, in terms of the scaling laws that govern the oscillatory flow regime. Unsteady Euler-Bernoulli beam theory is employed to derive instantaneous transversal force distributions on the deflecting hydrofoil from its deflection and thereby validate the spatial distributions of hydrodynamic stresses obtained from the fluid velocity field. The consistency of the force time-dependence is verified using a control volume analysis.

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The estimation of pressure on the surface of a flapping rigid plate by stereo PIV

Cited by 10 publications

References 15 publications

The role of suction thrust in the metachronal paddles of swimming invertebrates

The role of suction thrust in the metachronal paddles of swimming invertebrates

Hydrodynamic stress maps on the surface of a flexible fin-like foil

Hydrodynamic stress maps on the surface of a flexible fin-like foil

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