Numerical simulations of wake characteristics of a horizontal axis tidal stream turbine using actuator line model.

Journal article


Baba-Ahmadi, Mohammad H. and Dong, Ping 2017. Numerical simulations of wake characteristics of a horizontal axis tidal stream turbine using actuator line model. Renewable Energy. https://doi.org/10.1016/j.renene.2017.06.035
AuthorsBaba-Ahmadi, Mohammad H. and Dong, Ping
Abstract

The wake of a laboratory scale tidal stream turbine in a shallow water channel with a turbulent inflow is simulated using the hybrid LES/ALM technique, which combines large eddy simulation with the actuator line method. The turbulent inlet conditions are generated using the mapping method to avoid a precursor running and large space for saving data. The numerical results demonstrated the usefulness of the mapping technique as well as some shortcomings that still remain to be addressed. Good agreement between numerical predictions and experimental data is achieved for both the mean and turbulent characteristics of the flow behind the turbine. The examination of changes in turbulence intensity and turbulent kinetic energy in the streamwise direction confirms the existence of a peak and transition to a highly turbulent flow about three diameters downstream of the turbine, which means that the distinct characteristics of the streamwise changes of turbulence intensity or turbulent kinetic energy may serve as an effective indicator for the flow regime transition and wake behaviour.

KeywordsTidal stream turbine; Actuator line modelling (ALM); Large eddy simulation (LES); Turbulent inflow generation
Year2017
JournalRenewable Energy
PublisherElsevier
ISSN0960-1481
Digital Object Identifier (DOI)https://doi.org/10.1016/j.renene.2017.06.035
Web address (URL)http://hdl.handle.net/10545/623215
hdl:10545/623215
Publication dates10 Jun 2017
Publication process dates
Deposited12 Dec 2018, 16:14
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Archived with thanks to Renewable Energy

ContributorsUniversity of Dundee and University of Liverpool
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https://repository.derby.ac.uk/item/94089/numerical-simulations-of-wake-characteristics-of-a-horizontal-axis-tidal-stream-turbine-using-actuator-line-model

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