CFD modelling of a tidal stream turbine subjected to profiled flow and surface gravity waves

Tatum, Sarah C., Allmark, Matthew ORCID: https://orcid.org/0000-0002-6812-3571, Frost, Carwyn ORCID: https://orcid.org/0000-0002-8985-5579, O'Doherty, Daphne Maria, Mason-Jones, Allan ORCID: https://orcid.org/0000-0002-1777-6679 and O'Doherty, Timothy ORCID: https://orcid.org/0000-0003-2763-7055 2016. CFD modelling of a tidal stream turbine subjected to profiled flow and surface gravity waves. Presented at: European Wave and Tidal Energy Conference, Nantes, France, 6-11 September 2015.

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Abstract

This study used computational fluid dynamics to investigate the effect of waves and a velocity profile on the performance of a tidal stream turbine (TST). A full scale TST was transiently modelled operating near its maximum power point, and then subjected to waves both in and out of phase with its period of rotation. A profile was then added to one of the wave models. For this set of conditions it was found that the longer period and in-phase wave had a significant effect on the power range fluctuations, with more modest variations for thrust and the average values, although this is dependent on the turbine tip speed ratio. The addition of the profile had a strong effect on the bending moment. It has been concluded that a naturally varying sea state may yield a smoothing effect in this turbine response, but that with further structural investigation it may be that some measuring and mitigation techniques are required in the event of a predominantly single long period, in-phase wave.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering
Funders:	EPSRC, LCRI, Fujitsu
Related URLs:	Organisation
Date of First Compliant Deposit:	30 March 2016
Date of Acceptance:	1 August 2015
Last Modified:	17 Nov 2022 11:54
URI:	https://orca.cardiff.ac.uk/id/eprint/81361

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