Hydroelastic effects during the fast lifting of a disc from a water surface – CORRIGENDUM

Vega-Martínez, Patricia; Rodríguez-Rodríguez, Javier; Хабахпашева, Т. И.; Korobkin, A.A.

doi:10.1017/jfm.2019.650

Cited by 1 publication

(3 citation statements)

References 2 publications

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“…This fast movement alternately accelerates and decelerates the fluid below, increasing the undulating body's effective mass and triggering an inertial force on the body. This “added mass” force, which had been previously used to calculate the force needed to quickly lift a circular disk from the water surface, [ 13 ] is utilized to determine the force due to fluid acceleration. The second force stems from the interface deformation.…”

Section: Resultsmentioning

confidence: 99%

“…We specifically incorporate the added mass in our analysis as it offers a reasonable estimate of the hydrodynamic force acting on an object rapidly lifted from the water surface, especially during the initial stages. [ 13 ] Additionally, the undulatory movement deforms the water surface. This deformation is significant for inducing capillary force‐induced thrust or drag, which is comparable in magnitude to the thrust generated from both the wave and added mass.…”

Section: Discussionmentioning

confidence: 99%

“…The force due to added mass was calculated from the body profiles with a 2D assumption. According to a linearized model of water exit, [ 13 ] the hydrodynamic force can be modeled as the added mass times the acceleration. The force due to added mass acting on the segment between adjacent digitized points was calculated by

where a ( s ) is the acceleration of the body segment at the coordinate s , and ρ is the water density at room temperature.…”

Section: Methodsmentioning

confidence: 99%

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Undulatory Propulsion at Milliscale on Water Surface

Ren,

Ucak,

Yan

et al. 2024

Advanced Science

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The oscillatory pitch motion at the leading edge of a millimeter‐scale flexible sheet on the water surface can generate undulatory locomotion for swimming, similar to a honeybee vibrating its wings for propulsion. The influence of various parameters on such swimming strategy remains unexplored. This study uses magnetic milliswimmers to probe the propulsion mechanics and impact of different parameters. It is found that this undulatory propulsion is driven by capillary forces and added mass effects related to undulatory waves of the milliswimmers, along with radiation stress stemming from capillary waves at the interface. Modifying the parameters such as actuation frequency, pitch amplitude, bending stiffness, and hydrofoil length alters the body waveform, thus, affecting the propulsion speed and energy efficiency. Although undulatory motion is not a prerequisite for water surface propulsion, optimizing body stiffness to achieve a proper undulatory waveform is crucial for efficient swimming, balancing energy consumption, and speed. The study also reveals that the induced water flow is confined near the water surface, and the flow structures evolve with varying factors. These discoveries advance the understanding of undulatory water surface propulsion and have implications for the optimal design of small‐scale swimming soft robots in the future.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

where a ( s ) is the acceleration of the body segment at the coordinate s , and ρ is the water density at room temperature.…”

Section: Methodsmentioning

confidence: 99%

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