Estimation of tidal power potential

Walters, Roy A.; Tarbotton, Michael; Hiles, Clayton E.

doi:10.1016/j.renene.2012.09.027

Cited by 39 publications

(27 citation statements)

References 16 publications

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“…The ability of the model to simulate tidal turbine effects using a form drag approach has been demonstrated previously [26,33], and the model has been applied in other locations to estimate potential marine energy generation [24,25]. Form drag from subgrid objects must be dealt with by integral methods to connect the subgrid scale with the model scale [26], but clearly, subgrid scale effects cannot be reproduced with this method.…”

Section: Discussionmentioning

confidence: 99%

“…It has been tested on a variety of benchmarks against both analytical and experimental data sets (e.g., [18][19][20]). The model has been previously used to investigate the inundation risk from tsunamis and storm surge on the New Zealand coastline [19,21,22], to study tidal currents in high energy tidal environments [23] and, more recently, to study tidal energy resource [24][25][26] and the effects of energy extraction on the ambient environment [11].…”

Section: Sea Surface Height Datamentioning

confidence: 99%

“…The Coriolis term is solved using a 3rd order Adams-Bashforth method [29]. Full details of the model discretization and solution methods, including the basis of the application to tidal energy, are given elsewhere [25,26]. The solution methods provide a fast, accurate and robust code that runs efficiently on multi-core desktop workstations with shared memory using OpenMP (http://openmp.org/).…”

Section: Sea Surface Height Datamentioning

confidence: 99%

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Numerical Simulations of the Effects of a Tidal Turbine Array on Near-Bed Velocity and Local Bed Shear Stress

Gillibrand

Walters²,

McIlvenny

2016

Energies

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Abstract:We apply a three-dimensional hydrodynamic model to consider the potential effects of energy extraction by an array of tidal turbines on the ambient near-bed velocity field and local bed shear stress in a coastal channel with strong tidal currents. Local bed shear stress plays a key role in local sediment dynamics. The model solves the Reynold-averaged Navier-Stokes (RANS) equations on an unstructured mesh using mixed finite element and finite volume techniques. Tidal turbines are represented through an additional form drag in the momentum balance equation, with the thrust imparted and power generated by the turbines being velocity dependent with appropriate cut-in and cut-out velocities. Arrays of 1, 4 and 57 tidal turbines, each of 1.5 MW capacity, were simulated. Effects due to a single turbine and an array of four turbines were negligible. The main effect of the array of 57 turbines was to cause a shift in position of the jet through the tidal channel, as the flow was diverted around the tidal array. The net effect of this shift was to increase near-bed velocities and bed shear stress along the northern perimeter of the array by up to 0.8 m·s −1 and 5 Pa respectively. Within the array and directly downstream, near-bed velocities and bed shear stress were reduced by similar amounts. Changes of this magnitude have the potential to modify the known sand and shell banks in the region. Continued monitoring of the sediment distributions in the region will provide a valuable dataset on the impacts of tidal energy extraction on local sediment dynamics. Finally, the mean power generated per turbine is shown to decrease as the turbine array increased in size.

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Section: Discussionmentioning

confidence: 99%

Section: Sea Surface Height Datamentioning

confidence: 99%

Section: Sea Surface Height Datamentioning

confidence: 99%

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Numerical Simulations of the Effects of a Tidal Turbine Array on Near-Bed Velocity and Local Bed Shear Stress

Gillibrand

Walters²,

McIlvenny

2016

Energies

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“…3,[16][17][18][19][20][21][22] These simulations are essential to accurately predicting the loads that will be applied to structural models. Stall and turbulence transition models are active areas of CFD research that will have large effects on the performance and loading results.…”

Section: Research Pathsmentioning

confidence: 99%

Technological Cost-Reduction Pathways for Axial-Flow Turbines in the Marine Hydrokinetic Environment.

Laird¹,

Johnson²,

Ochs³

et al. 2013

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This report considers and prioritizes potential technical cost-reduction pathways for axial-flow turbines designed for tidal, river, and ocean current resources. This report focuses on technical research and development cost-reduction pathways related to the device technology rather than environmental monitoring or permitting opportunities. Three sources of information were utilized to understand current cost drivers and develop a list of potential cost-reduction pathways: a literature review of technical work related to axial-flow turbines, the U.S. Department of Energy Reference Model effort, and informal webinars and other targeted interactions with industry developers. Data from these various information sources were aggregated and prioritized with respect to potential impact on the lifetime levelized cost of energy. The four most promising cost-reduction pathways include structural design optimization; improved deployment, maintenance, and recovery; system simplicity and reliability; and array optimization.

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“…Recently, the researchers gave more attention to the amount of harnessed power in the open channels current flow. Thus, references [7][8][9][10][11][12][13][14] presented various analytical and numerical methods in detail to estimate the tidal current potential power in channels. Instream technology is a young type of small and micro hydro-power system and it is based on deploying of the hydrokinetic turbines in flow of rivers or canal to generate energy, this type of application is a potential to the future of power generation [15,16].…”

Section: Introductionmentioning

confidence: 99%

Numerical study for the use of different nozzle shapes in microscale channels for producing clean energy

Elbatran

Yaakob

Ahmed

et al. 2015

Int J Energy Environ Eng

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Nowadays, most rural and hilly areas use the small and microscale plants to produce electricity; it is cheap, available and effective. Utilizing hydrokinetic turbines in flow of rivers, canal or channel to produce power has been a topic of considerable interest to researchers for past years. Many countries that are surrounded by irrigation or rainy channels have a great potential for developing this technology. Development of open flow microchannels that suit these countries has a main problem, which is low velocity of current appears, hence deploying nozzle in-stream open channels flow is the brilliant method for increasing the channels current flow systems' efficiency. The nozzle is believed to have an ability of concentrating the flow direction whilst increasing the flow velocity. In this study, the effects of nozzle geometrical parameters such as diameter ratio, nozzle configuration and nozzle edges shape on the characteristics of the flow in the microscale rectangular channels have been investigated numerically, using a finite volume RANSE code ANSYS CFX. The physical parameters were reported for a range of diameter ratio (d 2 /d 1 ) from 5/6 to 1/6 and nozzle length (L n ) of 0.8 m for various nozzle shapes. We also proposed a new approach which is the use of NACA 0025 aerofoils as a deploying nozzle in channels. The results of the current study showed that, although the decrease in the nozzle diameter ratio led to an increase of the flow velocity through the channel but it can affect drastically on the flow pattern, especially the free surface, at the nozzle area, which may reduce the amount of the generated power, thus the study concluded with optimum diameter ratio, which was 2/3. The flow patterns improved with the curved edges shape; the NACA shape gave the most preferable results.

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Estimation of tidal power potential

Cited by 39 publications

References 16 publications

Numerical Simulations of the Effects of a Tidal Turbine Array on Near-Bed Velocity and Local Bed Shear Stress

Numerical Simulations of the Effects of a Tidal Turbine Array on Near-Bed Velocity and Local Bed Shear Stress

Technological Cost-Reduction Pathways for Axial-Flow Turbines in the Marine Hydrokinetic Environment.

Numerical study for the use of different nozzle shapes in microscale channels for producing clean energy

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