scholarly journals Modelling of the flow field surrounding tidal turbine arrays for varying positions in a channel

2013 ◽  
Vol 371 (1985) ◽  
pp. 20120246 ◽  
Author(s):  
T Daly ◽  
L. E Myers ◽  
A. S Bahaj
Keyword(s):  
Numerical Modelling ◽  
Research Programme ◽  
Tidal Power ◽  
Power Extraction ◽  
Tidal Turbine ◽  
Flow Effects ◽  
The Many ◽  
Hydraulics Laboratory ◽  
Turbine Arrays ◽  
Hydrodynamic Effects

The modelling of tidal turbines and the hydrodynamic effects of tidal power extraction represents a relatively new challenge in the field of computational fluid dynamics. Many different methods of defining flow and boundary conditions have been postulated and examined to determine how accurately they replicate the many parameters associated with tidal power extraction. This paper outlines the results of numerical modelling analysis carried out to investigate different methods of defining the inflow velocity boundary condition. This work is part of a wider research programme investigating flow effects in tidal turbine arrays. Results of this numerical analysis were benchmarked against previous experimental work conducted at the University of Southampton Chilworth hydraulics laboratory. Results show significant differences between certain methods of defining inflow velocities. However, certain methods do show good correlation with experimental results. This correlation would appear to justify the use of these velocity inflow definition methods in future numerical modelling of the far-field flow effects of tidal turbine arrays.

Integration of Ecological and Engineering Aspects in Planning Large Scale Tidal Power Development in the Bay of Fundy, Canada

1984 ◽  
Vol 16 (1-2) ◽  
pp. 281-295 ◽  
Author(s):  
Donald C Gordon
Keyword(s):  
Large Scale ◽  
Feasibility Studies ◽  
Bay Of Fundy ◽  
Final Decision ◽  
Power Development ◽  
Tidal Power ◽  
History Of ◽  
Scientists And Engineers ◽  
The Many ◽  
University Scientists

Large-scale tidal power development in the Bay of Fundy has been given serious consideration for over 60 years. There has been a long history of productive interaction between environmental scientists and engineers durinn the many feasibility studies undertaken. Up until recently, tidal power proposals were dropped on economic grounds. However, large-scale development in the upper reaches of the Bay of Fundy now appears to be economically viable and a pre-commitment design program is highly likely in the near future. A large number of basic scientific research studies have been and are being conducted by government and university scientists. Likely environmental impacts have been examined by scientists and engineers together in a preliminary fashion on several occasions. A full environmental assessment will be conducted before a final decision is made and the results will definately influence the outcome.

Direct optimal power extraction control for a tidal turbine system based on fuzzy power tuning

2018 ◽  
Vol 170 ◽  
pp. 426-433 ◽  
Author(s):  
Xiuxing Yin ◽  
Meizhen Lei ◽  
Haipeng Pan
Keyword(s):  
Power Extraction ◽  
Optimal Power ◽  
Tidal Turbine

scholarly journals Determination of Potential Tidal Power Sites at East Malaysia

2020 ◽  
Vol 10 (4) ◽  
pp. 6047-6051 ◽  
Author(s):  
K. A. Samo ◽  
I. A. Samo ◽  
Z. A. Siyal ◽  
A. R. H. Rigit
Keyword(s):  
Renewable Energy ◽  
Potential Energy ◽  
Energy Harvester ◽  
Tidal Range ◽  
Energy Extraction ◽  
Tidal Power ◽  
Maximum Capacity ◽  
Power Extraction ◽  
East Malaysia

Tidal range energy is one of the most predictable and reliable sources of renewable energy. This study’s main aim is to determine potential sites for tidal range power in East Malaysia, by analyzing tidal range distributions and resources and the feasibility of constructing barrages. Investigation was conducted in 34 sites, estimating their potential energy outputs and studying their areas for constructing barrages. Only 18 sites were marked as appropriate for constructing a tidal range energy extraction barrage. The highest potential power was found in Tanjung Manis, and its maximum capacity was calculated as 50.7kW. The second highest potential of tidal power extraction was found in Kuching Barrage at Pending, where an energy harvester could produce electric power up to 33.1kW.

scholarly journals Safeguarding Adults Reviews: Prompting practice and policy

2017 ◽  
Vol 18 (3) ◽  
pp. 23-32
Author(s):  
Jill Manthorpe ◽  
Stephen Martineau
Keyword(s):  
Review Process ◽  
Research Programme ◽  
User Group ◽  
Children's Services ◽  
Policy And Practice ◽  
Practice Analysis ◽  
Children’S Services ◽  
The Many ◽  
Practice Development

Abstract: As a whole there was remarkably little controversy in England over the Care Act 2014, once debates over funding caps had been kicked into the long grass. After all, who could oppose the idea of better information, clearer entitlements, and more support for carers? Among the non-contentious areas were specific proposals for Serious Case Reviews (SCRs) to become Safeguarding Adults Reviews (SARs). In light of the many concerns in children’s services about the dominance of SCRs in policy and practice debates this lack of interest and discussion may seem surprising. In this paper we explore why such reviews concerning adults are largely seen as non-contentious and frame our analysis around four different ‘prompts’; those from Parliament, from earlier SCRs, from practice analysis and from practice development. We draw on our own wider research programme on Adult SCRs and subsequently SARs. This programme of research has explored different facets of the review process and undertaken different thematic analyses by location or user group.

scholarly journals Hydrodynamic Effects of Tidal-Stream Power Extraction for Varying Turbine Operating Conditions

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3240
Author(s):  
Lilia Flores Mateos ◽  
Michael Hartnett
Keyword(s):  
Thrust Force ◽  
Operating Conditions ◽  
Blockage Ratio ◽  
Stream Power ◽  
Power Extraction ◽  
Tidal Stream ◽  
Electrical Generation ◽  
Hydrodynamic Effects ◽  
Turbine Wake ◽  
Tidal Stream Power

Realistic evaluation of tidal-stream power extraction effects on local hydrodynamics requires the inclusion of the turbine’s operating conditions (TOC). An alternative approach for simulating the turbine’s array energy capture at a regional scale, momentum sink-TOC, is used to assess the impact of power extraction. The method computes a non-constant thrust force calculated based on the turbine’s operating conditions, and it uses the wake induction factor and blockage ratio to characterise the performance of a turbine. Additionally, the momentum sink-TOC relates the changes produced by power extraction, on the velocity and sea surface within the turbine’s near-field extension, to the turbine’s thrust force. The method was implemented in two hydrodynamic models that solved gradually varying flows (GVF) and rapidly varying flows (RVF). The local hydrodynamic effects produced by tidal-stream power extraction for varying the turbine’s operating conditions was investigated in (i) the thrust and power coefficient calculation, (ii) flow rate reduction, and (iii) tidal currents’ velocity and elevation profiles. Finally, for a turbine array that operates at optimal conditions, the potential energy resource was assessed. The maximisation of power extraction for electrical generation requires the use of an optimum turbine wake induction factor and an adequate blockage ratio, so that the power loss due to turbine wake mixing is reduced. On the other hand, the situations where limiting values of these parameters are used should be avoided as they lead to negligible power available. In terms of hydrodynamical models, an RVF solver provided a more accurate evaluation of the turbine’s operating conditions effect on local hydrodynamics. Particularly satisfactory results were obtained for a partial-fence. In the case of a fence configuration, the GVF solver was found to be a computationally economical tool to pre-assess the resource; however, caution should be taken as the solver did not accurately approximate the velocity decrease produced by energy extraction.

scholarly journals Tidal current power effects on nearby sandbanks: a case study in the Race of Alderney

2020 ◽  
Vol 378 (2178) ◽  
pp. 20190503 ◽  
Author(s):  
Luke S. Blunden ◽  
Stephen G. Haynes ◽  
AbuBakr S. Bahaj
Keyword(s):  
Sediment Transport ◽  
Tidal Energy ◽  
Sand Wave ◽  
Sand Transport ◽  
Tidal Dynamics ◽  
Tidal Flows ◽  
Tidal Turbine ◽  
Turbine Arrays ◽  
Sediment Model

A validated numerical model of tidal flows and sediment transport around the Alderney South Banks was used to investigate the potential effects of large (300 MW) tidal turbine arrays at different locations in Alderney territorial waters. Two methods were used, firstly looking at hydrodynamic changes only and secondly modelling sediment transport over a non-erodible bed. The baseline hydrodynamic model was validated relative to ADCP velocity data collected in the immediate vicinity of the sandbank. Real-world sand transport rates were inferred from sand-wave migrations and agree favourably with sediment transport residuals calculated from model outputs. Outputs from the sediment model reproduced realistic morphological behaviours over the bank. Seventeen different locations were considered; most did not result in significant hydrodynamic changes over the South Banks; however, three array locations were singled out as requiring extra caution if development were to occur. The results provide a case for optimizing the array locations for twin objectives of maximizing array power and minimizing impacts on the sandbanks. This article is part of the theme issue ‘New insights on tidal dynamics and tidal energy harvesting in the Alderney Race’.

scholarly journals Performance of non-uniform tidal turbine arrays in uniform flow

2018 ◽  
Vol 4 (3) ◽  
pp. 231-241 ◽  
Author(s):  
Paul A. J. Bonar ◽  
Thomas A. A. Adcock ◽  
Vengatesan Venugopal ◽  
Alistair G. L. Borthwick
Keyword(s):  
Uniform Flow ◽  
Tidal Turbine ◽  
Turbine Arrays
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