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Added mass and damping forces of a floating tidal turbine undergoing pendulum motion

Many commercial engineering software programmes used to design floating tidal turbines neglect the added mass and damping because most of the code considers floating wind turbine designs, which is acceptable since air is significantly less dense than seawater. However, added mass and damping forces...

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Main Authors:	Osman, Mohamad Hasif, Willden, Richard
Format:	Article
Published:	Elsevier Ltd 2023
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://eprints.utm.my/106057/ http://dx.doi.org/10.1016/j.oceaneng.2023.115014
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id	my.utm.106057
record_format	eprints
spelling	my.utm.1060572024-05-31T03:05:05Z http://eprints.utm.my/106057/ Added mass and damping forces of a floating tidal turbine undergoing pendulum motion Osman, Mohamad Hasif Willden, Richard TA Engineering (General). Civil engineering (General) Many commercial engineering software programmes used to design floating tidal turbines neglect the added mass and damping because most of the code considers floating wind turbine designs, which is acceptable since air is significantly less dense than seawater. However, added mass and damping forces are important parameters that need to be included in the design of a floating tidal turbine. The increase in instantaneous time-dependent loading and changes in the natural frequency of a floating tidal turbine make these hydrodynamic forces non-negligible, especially for large turbines. The present study describes the construction of matrices of added mass and damping that can be used as inputs to simpler engineering models. These matrices were constructed by conducting three-dimensional blade-resolved CFD simulations for a floating tidal turbine operating under a prescribed pitch motion (i.e., pendulum-like motion) under various motion amplitudes and frequencies. The added mass and damping were also empirically extracted from the fluctuating thrust force, the empirical model derivation of which is given in this paper. Higher motion amplitude and frequency increase the pressure on rotor blades, which increases the amplitude of loading variations. A floating tidal turbine's mean power and thrust deviate from that of a stationary turbine due to suboptimal rotor operating conditions caused by the change in tip speed ratio (which is due to the apparent velocity variation). Formulations can be constructed (as functions of motion amplitude and frequency) to calculate added mass and damping forces based on the data of hydrodynamic forces provided in this paper, which can be applied to a conventional turbine design model. The added mass and damping forces increase the overall mass and damping of the floating rotor, respectively, which affects the motion and loading of the device. Elsevier Ltd 2023-09-01 Article PeerReviewed Osman, Mohamad Hasif and Willden, Richard (2023) Added mass and damping forces of a floating tidal turbine undergoing pendulum motion. Ocean Engineering, 283 (NA). NA. ISSN 0029-8018 http://dx.doi.org/10.1016/j.oceaneng.2023.115014 DOI:10.1016/j.oceaneng.2023.115014
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) Osman, Mohamad Hasif Willden, Richard Added mass and damping forces of a floating tidal turbine undergoing pendulum motion
description	Many commercial engineering software programmes used to design floating tidal turbines neglect the added mass and damping because most of the code considers floating wind turbine designs, which is acceptable since air is significantly less dense than seawater. However, added mass and damping forces are important parameters that need to be included in the design of a floating tidal turbine. The increase in instantaneous time-dependent loading and changes in the natural frequency of a floating tidal turbine make these hydrodynamic forces non-negligible, especially for large turbines. The present study describes the construction of matrices of added mass and damping that can be used as inputs to simpler engineering models. These matrices were constructed by conducting three-dimensional blade-resolved CFD simulations for a floating tidal turbine operating under a prescribed pitch motion (i.e., pendulum-like motion) under various motion amplitudes and frequencies. The added mass and damping were also empirically extracted from the fluctuating thrust force, the empirical model derivation of which is given in this paper. Higher motion amplitude and frequency increase the pressure on rotor blades, which increases the amplitude of loading variations. A floating tidal turbine's mean power and thrust deviate from that of a stationary turbine due to suboptimal rotor operating conditions caused by the change in tip speed ratio (which is due to the apparent velocity variation). Formulations can be constructed (as functions of motion amplitude and frequency) to calculate added mass and damping forces based on the data of hydrodynamic forces provided in this paper, which can be applied to a conventional turbine design model. The added mass and damping forces increase the overall mass and damping of the floating rotor, respectively, which affects the motion and loading of the device.
format	Article
author	Osman, Mohamad Hasif Willden, Richard
author_facet	Osman, Mohamad Hasif Willden, Richard
author_sort	Osman, Mohamad Hasif
title	Added mass and damping forces of a floating tidal turbine undergoing pendulum motion
title_short	Added mass and damping forces of a floating tidal turbine undergoing pendulum motion
title_full	Added mass and damping forces of a floating tidal turbine undergoing pendulum motion
title_fullStr	Added mass and damping forces of a floating tidal turbine undergoing pendulum motion
title_full_unstemmed	Added mass and damping forces of a floating tidal turbine undergoing pendulum motion
title_sort	added mass and damping forces of a floating tidal turbine undergoing pendulum motion
publisher	Elsevier Ltd
publishDate	2023
url	http://eprints.utm.my/106057/ http://dx.doi.org/10.1016/j.oceaneng.2023.115014
_version_	1800714798960214016
score	13.2442

Added mass and damping forces of a floating tidal turbine undergoing pendulum motion

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