Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations

A numerical simulation is used to investigate the effects of adding high frequency and low amplitude perturbations of different waveforms to the sinusoidal-based signal of the heaving foil on the propulsion performance and wake structure. We use the adjustable parameter <i>k</i> to achie...

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Autores principales:	Pengcheng Gao, Qiaogao Huang, Guang Pan
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	heaving foil different waveform perturbation hydrodynamic characteristics vortex structure Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/8acbf7e0a2b34ec080c3b6c432f4d856
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spelling	oai:doaj.org-article:8acbf7e0a2b34ec080c3b6c432f4d8562021-11-25T18:04:56ZPropulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations10.3390/jmse91112712077-1312https://doaj.org/article/8acbf7e0a2b34ec080c3b6c432f4d8562021-11-01T00:00:00Zhttps://www.mdpi.com/2077-1312/9/11/1271https://doaj.org/toc/2077-1312A numerical simulation is used to investigate the effects of adding high frequency and low amplitude perturbations of different waveforms to the sinusoidal-based signal of the heaving foil on the propulsion performance and wake structure. We use the adjustable parameter <i>k</i> to achieve a heaving motion of various waveform cycle trajectories, such as sawtooth, sine, and square. Adding a perturbation of whatever waveform is beneficial in increasing the thrust of the heaving foil, especially by adding a square wave perturbation with a frequency of 10 Hz, pushes the thrust up to 10.49 times that without the perturbation. However, the addition of the perturbation signal brings a reduction in propulsion efficiency, and the larger the perturbation frequency, the lower the efficiency. The wake structure of the heaving foil behaves similarly under different waveform perturbations, all going through some intermediate stages, which eventually evolve into a chaotic wake with the increase in the perturbation frequency. However, a lower frequency square wave perturbation can destabilize the heaving foil wake structure. This work further explains the effect of different waveform perturbation signals on the base sinusoidal signal and provides a new control idea for underwater vehicles.Pengcheng GaoQiaogao HuangGuang PanMDPI AGarticleheaving foildifferent waveform perturbationhydrodynamic characteristicsvortex structureNaval architecture. Shipbuilding. Marine engineeringVM1-989OceanographyGC1-1581ENJournal of Marine Science and Engineering, Vol 9, Iss 1271, p 1271 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	heaving foil different waveform perturbation hydrodynamic characteristics vortex structure Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
spellingShingle	heaving foil different waveform perturbation hydrodynamic characteristics vortex structure Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 Pengcheng Gao Qiaogao Huang Guang Pan Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations
description	A numerical simulation is used to investigate the effects of adding high frequency and low amplitude perturbations of different waveforms to the sinusoidal-based signal of the heaving foil on the propulsion performance and wake structure. We use the adjustable parameter <i>k</i> to achieve a heaving motion of various waveform cycle trajectories, such as sawtooth, sine, and square. Adding a perturbation of whatever waveform is beneficial in increasing the thrust of the heaving foil, especially by adding a square wave perturbation with a frequency of 10 Hz, pushes the thrust up to 10.49 times that without the perturbation. However, the addition of the perturbation signal brings a reduction in propulsion efficiency, and the larger the perturbation frequency, the lower the efficiency. The wake structure of the heaving foil behaves similarly under different waveform perturbations, all going through some intermediate stages, which eventually evolve into a chaotic wake with the increase in the perturbation frequency. However, a lower frequency square wave perturbation can destabilize the heaving foil wake structure. This work further explains the effect of different waveform perturbation signals on the base sinusoidal signal and provides a new control idea for underwater vehicles.
format	article
author	Pengcheng Gao Qiaogao Huang Guang Pan
author_facet	Pengcheng Gao Qiaogao Huang Guang Pan
author_sort	Pengcheng Gao
title	Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations
title_short	Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations
title_full	Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations
title_fullStr	Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations
title_full_unstemmed	Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations
title_sort	propulsion performance and wake dynamics of heaving foils under different waveform input perturbations
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8acbf7e0a2b34ec080c3b6c432f4d856
work_keys_str_mv	AT pengchenggao propulsionperformanceandwakedynamicsofheavingfoilsunderdifferentwaveforminputperturbations AT qiaogaohuang propulsionperformanceandwakedynamicsofheavingfoilsunderdifferentwaveforminputperturbations AT guangpan propulsionperformanceandwakedynamicsofheavingfoilsunderdifferentwaveforminputperturbations
_version_	1718411628949536768

Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations

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