Simulating the Wake Downstream of a Horizontal Axis Tidal Turbine Using a Modified Vorticity Transport Model

Vybulkova, Lada; Vezza, M.; Brown, Richard E.

doi:10.1109/joe.2015.2429231

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…11c). The channel bed induced turbulence aids in entraining fluid into the wake and this is in line with the findings by Vybulkova et al [48] who investigated the effects of a parabolic approach flow velocity distribution on the wake of a HATT in comparison with an uniform approach flow.…”

Section: Effect Of Free-stream Turbulence On Rotor Hydrodynamicssupporting

confidence: 88%

Hydrodynamic loadings on a horizontal axis tidal turbine prototype

Ouro

Harrold²,

Stoesser

et al. 2017

Journal of Fluids and Structures

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Until recently tidal stream turbine design has been carried out mainly by experimental prototype testing aiming at maximum turbine efficiency. The harsh and highly turbulent environments in which tidal stream turbines operate in poses a design challenge mainly with regards to survivability of the turbine owing to the fact that tidal turbines are exposed to significant intermittent hydrodynamic loads. Credible numerical models can be used as a complement to experiments during the design process of tidal stream turbines. They can provide insights into the hydrodynamics, predict tidal turbine performance and clarify their fluid-structure interaction as well as quantify the hydrodynamic loadings on the rotor. The latter can lead to design enhancements aiming at increased robustness and survivability of the turbine. Physical experiments and complementary large-eddy simulations of flow around a horizontal axis tidal turbine rotor are presented. The goal is to provide details of the hydrodynamics around the rotor, the performance of the turbine and acting hydrodynamic forces on the rotor blades. The simulation results are first compared with the

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Section: Effect Of Free-stream Turbulence On Rotor Hydrodynamicssupporting

confidence: 88%

Hydrodynamic loadings on a horizontal axis tidal turbine prototype

Ouro

Harrold²,

Stoesser

et al. 2017

Journal of Fluids and Structures

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“…The vortex three-dimensional flow features are similar to those described by Leishman (2006), Pinon et al (2012), andMason-Jones et al (2013). The inclination of the helical structures has been attributed to the effect of the sediment bed (Vybulkova, 2013;Vybulkova et al, 2016), and also to an upward flow behind the turbine (Mason-Jones et al, 2013). Regarding asymmetries, several studies have found clear differences although not much attention has been given to them.…”

Section: Discussionsupporting

confidence: 71%

“…Fletcher and Brown, 2008;Houston and Brown, 2003;Green et al, 2005), wind turbines (e.g. Fletcher and Brown, 2010;, and tidal turbines (Vybulkova et al, 2016).…”

Section: Numerical Modellingmentioning

confidence: 99%

Asymmetric effects of a modelled tidal turbine on the flow and seabed

Ramírez-Mendoza

Murdoch²,

Jordan³

et al. 2020

Renewable Energy

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The extraction of power from the flow of water has become an important potential source of clean energy. In spite of significant interest in the interaction between energy extraction devices and water currents, comparatively little work has focused on flow asymmetry. Indeed, unusual wake behaviour and limits of turbine array efficiency have typically been attributed to boundary effects rather than the particular turbine geometry. The aim of the present study was to reveal the asymmetries in the hydrodynamic wake and the interactions with the sediment bed due to the presence of a hydrokinetic turbine. We combined:(i) computational fluid dynamics simulations; (ii) optical flow measurements from a series of flume experiments above a fixed rough bed; and (iii) acoustic measurements from a further series of flume experiments above a mobile sand bed. Results showed flow asymmetry due to the presence of the rotor which appeared to be related to the development of the wake and potentially to the gyre of the blades. Suspended sediments in the flume also exhibited asymmetrical characteristics due to the flow asymmetry. This imbalance in the flow field and sediment transport may decrease energy extraction efficiency in turbine arrays and also could have important environmental consequences.

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“…Equation is governed by the vorticity transport equation 17 . Then, the cost function to be minimised is given by ( ) ( )…”

Section: Mathematical Formulation 31 Semidefinite Programming Formulationmentioning

confidence: 99%

Perturbation Propagation Models for Underwater Sensor Localisation using Semidefinite Programming

Prateek

Arya

2021

Def. Sc. J.

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Real time Underwater sensor networks (UWSNs) suffer from localisation issues due to a dearth of incorporation of different geometric scenarios in UWSN scenarios. To address these issues, this paper visualises three specific scenarios of perturbation. First, small sized and large numbered particles of perturbance moving in a tangential motion to the sensor nodes; second, a single numbered and large-sized particle moving in a rectilinear motion by displacing the sensor nodes into sideward and forward direction, and third, a radially outward propagating perturbance to observe the influenced sensor nodes as the perturbance moves outwards. A novel target localisation and tracking is facilitated by including marine vehicle navigation as a source of perturbation. Using semidefinite programming, the proposed perturbation models minimise localisation errors, thereby enhancing physical security of underwater sensor nodes. By leveraging the spin, cleaving motion and radial cast-away behaviour of underwater sensor nodes, the results confirm that the proposed propagation models can be conveniently applied to real time target detection and estimation of underwater target nodes.

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Simulating the Wake Downstream of a Horizontal Axis Tidal Turbine Using a Modified Vorticity Transport Model

Cited by 6 publications

References 10 publications

Hydrodynamic loadings on a horizontal axis tidal turbine prototype

Hydrodynamic loadings on a horizontal axis tidal turbine prototype

Asymmetric effects of a modelled tidal turbine on the flow and seabed

Perturbation Propagation Models for Underwater Sensor Localisation using Semidefinite Programming

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