subject:(tidal current energy)

University of Manchester

1. Olczak, Alexander. The Influence of Waves on Tidal Stream Turbine Arrays.

Degree: 2016, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:298647

► The aim of this research was to quantify the influence of waves on arrays of tidal turbines. Experiments measured the wake of a turbine operating… (more)

▼ The aim of this research was to quantify the influence of waves on arrays of tidal turbines. Experiments measured the wake of a turbine operating in combined wave-current flows, these were found to reduce velocity deficit as opposed to current only flow. The vertical region of the wake affected was dependant on the wave depth parameter, kd.RANS-BEM and Actuator Line methods were implemented within a commercial CFD code to provide computationally efficient methodologies for the simulation of both large turbine arrays and a turbine subjected to unsteady flow. For scaled experiments thrust coefficient was within 7% and 1% of the flume experiments for the RANS-BEM and Actuator Line methods respectively. The methods were found to give good prediction of a single turbine wake at distances greater than four diameters downstream, provided values of inlet turbulence intensity and length scale were equal to those measured experimentally.An unsteady Actuator Line method was used to quantify rotor loads and wake generation for a turbine operating within combined wave-current flow. The use of a streamwise pulsatile flow was found to give similar rotor and blade loads to simulations using a wave in a two phase volume of fluid simulation. The control strategy adopted by the turbine was found to greatly influence the computed rotor loads and blade bending moments. The wake generated by an Actuator Line method showed a reduction in velocity, however this was smaller than that measured experimentally for equivalent wave conditions.The accuracy with which the RANS-BEM method computed turbine loads and wakes was quantified for a number of one, two and three row arrays. The square of the disk averaged velocity encountered by turbines downstream of a single row of five turbines was found to be predicted to within 5% and 28% for an aligned and staggered arrangement respectively. For the two row arrays, the thrust of individual turbines was within 31% of the experimental measurements. The merged wake downstream of the multiple turbines was well predicted.Measurements of the wake of five porous disks showed combined wave-current flow did not alter the wake in the same manner as a single isolated disk. Measurement of wave energy over the wake showed the downstream current field altered wave propagation, causing a reduction in wave energy over the wake but an increase over the bypass flow. The accuracy of the wave model SWAN was assessed for the calculation of this change in wave characteristics. The model gave good prediction of the lateral variation of wave height over the far wake, however discrepancies in the near wake and upstream of the disk occurred. Advisors/Committee Members: STANSBY, PETER PK, Stansby, Peter, Stallard, Timothy.

Subjects/Keywords: Tidal Energy; Wave; Current; Renewable Energy; Arrays; CFD; Experiments; Turbulence

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APA (6^th Edition):

Olczak, A. (2016). The Influence of Waves on Tidal Stream Turbine Arrays. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:298647

Chicago Manual of Style (16^th Edition):

Olczak, Alexander. “The Influence of Waves on Tidal Stream Turbine Arrays.” 2016. Doctoral Dissertation, University of Manchester. Accessed December 05, 2019. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:298647.

MLA Handbook (7^th Edition):

Olczak, Alexander. “The Influence of Waves on Tidal Stream Turbine Arrays.” 2016. Web. 05 Dec 2019.

Vancouver:

Olczak A. The Influence of Waves on Tidal Stream Turbine Arrays. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2019 Dec 05]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:298647.

Council of Science Editors:

Olczak A. The Influence of Waves on Tidal Stream Turbine Arrays. [Doctoral Dissertation]. University of Manchester; 2016. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:298647

Cranfield University

2. Martinez, Fabien. Drag study of the nacelles of a tidal stream device using CFD.

Degree: MSc by Research, 2010, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/7440

► Nowadays, renewable energy is in full growth. In particular, offshore wind farms will be at the centre of UK energetic strategy in the coming years.… (more)

Subjects/Keywords: Renewable energy; fluid dynamics; Deltastream; marine current turbine; tidal energy

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APA (6^th Edition):

Martinez, F. (2010). Drag study of the nacelles of a tidal stream device using CFD. (Masters Thesis). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/7440

Chicago Manual of Style (16^th Edition):

Martinez, Fabien. “Drag study of the nacelles of a tidal stream device using CFD.” 2010. Masters Thesis, Cranfield University. Accessed December 05, 2019. http://dspace.lib.cranfield.ac.uk/handle/1826/7440.

MLA Handbook (7^th Edition):

Martinez, Fabien. “Drag study of the nacelles of a tidal stream device using CFD.” 2010. Web. 05 Dec 2019.

Vancouver:

Martinez F. Drag study of the nacelles of a tidal stream device using CFD. [Internet] [Masters thesis]. Cranfield University; 2010. [cited 2019 Dec 05]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/7440.

Council of Science Editors:

Martinez F. Drag study of the nacelles of a tidal stream device using CFD. [Masters Thesis]. Cranfield University; 2010. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/7440

University of Edinburgh

3. Crossley, George Robert Northcote. Quantification of uncertainty in sub-sea acoustic measurement, and validation of wave-current kinematics, at a tidal energy site.

Degree: PhD, 2018, University of Edinburgh

URL: http://hdl.handle.net/1842/31541

► As developers seek to convert the energy of the tides into electricity, sub-sea turbines must be designed to perform well in increasingly harsh conditions. Such… (more)

▼ As developers seek to convert the energy of the tides into electricity, sub-sea turbines must be designed to perform well in increasingly harsh conditions. Such energetic seas have historically been avoided, hence measurements taken below the surface in strong tidal currents and large waves are relatively few, and the theory behind these interactions is underdeveloped. This thesis compares measurements of subsurface velocity taken in the field, at a UK site proposed for development, to the velocity outputs of a model capable of combining waves and currents in a number of ways. In particular the interaction between waves and currents is investigated. The methodology incorporates a novel virtual velocity measurement instrument to measure the model flow, replicating the physical instruments used at sea, such that direct comparisons can be made between the two data-sets. Model and field velocities show good agreement across a range of current speeds and wave heights, with a range of metrics used to demonstrate the suitability of the model, based on linear wave-current theory, for this site. The wave-current interaction module is calibrated, with linear superposition of wave and current velocities proving a suitable representation of field velocities. Calculation of a dispersion relationship affected by mean current velocity marginally improves calibration with field data. Analysis of other sites using the tools developed will further validate this type of model, which in combination with blade element momentum theory, is able to predict pre-construction site specific loads on tidal turbines. Doppler Current Profilers (DCPs) are able to measure subsurface water particle kinematics and sea surface elevation simultaneously, however assumptions made by these instruments jeopardise detail when recording in highly energetic seas, particularly where waves and turbulent tidal currents combine. Models developed to optimise the design of tidal turbines require correct site specific inputs to accurately reflect the conditions that a turbine may encounter through its lifetime, moreover, the kinematics of these models must be accurately validated. To overcome the limitations in DCP measurements a 'Virtual' Doppler Current Profiler (VDCP) is developed (Crossley et al. 2017), enabling quantification of error in site characteristics, and 'like for like' comparisons of field and model kinematics that has never previously been documented. The numerical model developed incorporates tidal currents, waves and turbulence combined linearly to output subsurface velocity based on conditions from the field which have been averaged over ten minute intervals. The inputs are simple, time averaged characteristics (current magnitude, direction, and profile; wave height, period and direction, turbulence intensity and turbulence length-scale) and the model outputs velocities over a two dimensional grid that develops with time. The VDCP samples this flow as if it were the very instrument in the field that recorded the data used for validation. Taking…

Subjects/Keywords: ADCP; tidal energy; wave-current; oceanology; ocean energy

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APA (6^th Edition):

Crossley, G. R. N. (2018). Quantification of uncertainty in sub-sea acoustic measurement, and validation of wave-current kinematics, at a tidal energy site. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/31541

Chicago Manual of Style (16^th Edition):

Crossley, George Robert Northcote. “Quantification of uncertainty in sub-sea acoustic measurement, and validation of wave-current kinematics, at a tidal energy site.” 2018. Doctoral Dissertation, University of Edinburgh. Accessed December 05, 2019. http://hdl.handle.net/1842/31541.

MLA Handbook (7^th Edition):

Crossley, George Robert Northcote. “Quantification of uncertainty in sub-sea acoustic measurement, and validation of wave-current kinematics, at a tidal energy site.” 2018. Web. 05 Dec 2019.

Vancouver:

Crossley GRN. Quantification of uncertainty in sub-sea acoustic measurement, and validation of wave-current kinematics, at a tidal energy site. [Internet] [Doctoral dissertation]. University of Edinburgh; 2018. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1842/31541.

Council of Science Editors:

Crossley GRN. Quantification of uncertainty in sub-sea acoustic measurement, and validation of wave-current kinematics, at a tidal energy site. [Doctoral Dissertation]. University of Edinburgh; 2018. Available from: http://hdl.handle.net/1842/31541

University of Plymouth

4. Thorpe, Antony. Sediment transport and bedform dynamics in rip currents.

Degree: PhD, 2016, University of Plymouth

URL: http://hdl.handle.net/10026.1/6558

► Simultaneous in-situ measurements of waves, currents, water depth, suspended sediment concentrations and bed profiles were made in a rip channel on Perranporth Beach, Cornwall, UK.… (more)

▼ Simultaneous in-situ measurements of waves, currents, water depth, suspended sediment concentrations and bed profiles were made in a rip channel on Perranporth Beach, Cornwall, UK. Perranporth is a high energy beach (annual offshore Hs = 1.6 m) which is macro-tidal (mean spring range = 6.3 m) and the grain size is medium sand (D50 = 0.28 – 0.34 mm). It can be classified as a low tide bar – rip beach and exhibits a relatively flat inter-tidal zone with pronounced rhythmic low tide bar - rip morphology. Data were collected over two field campaigns, totalling 14 tidal cycles and including 27 occurrences of rip currents, in a range of offshore wave heights (Hs = 0.5 – 3 m). The in-situ measurements were supplemented with morphological beach surveys. Sediment samples were taken for grain size analysis. The rip current was found to be tidally modulated. The strongest rip flow (0.7 m/s) occurred at mid to low tide, when waves were breaking on the adjacent bar. Rip flow persisted when the bar had dried out at the lowest tidal elevations. The rip was observed to pulse at a very low frequency (VLF) with a period of 15 - 20 minutes, which was shown to be influenced by wave breaking on the adjacent bar. The rip was completely in-active at high tide. Bedforms were ubiquitous in the rip channel and occurred at all stages of the tide. Visual observations found bedforms to be orientated shore parallel. When the rip was active, mean bedform length and height was 1.45 m and 0.06 m respectively. The size and position of the bedforms in the nearshore suggested that they were best classified as megaripples. When the rip was not active, the mean bedform length and height was 1.09 m and 0.06 m respectively. In rip conditions, with typical mean offshore flow rates of > 0.3 m/s, the bedforms migrated in an offshore direction at a mean rate of 0.16 cm/min and a maximum rate of 4.6 cm/min. The associated mean bedform sediment transport rate was 0.0020 kg/m/s, with a maximum rate of 0.054 kg/m/s. In the rip, migration rates were correlated with offshore directed mean flow strength. In non-rip conditions, bedform migration was onshore directed with a mean rate of 0.09 cm/min and a maximum rate of = 2.2 cm/min. The associated mean bedform transport rate was 0.0015 kg/m/s, with a maximum rate of = 0.041 kg/m/s. The onshore bedform transport was correlated with incident wave skewness, and was weakly correlated with orbital velocity. Over a tidal cycle, the offshore directed bedform transport was only marginally larger in rip currents than when it was when onshore directed in non-rip conditions. Sediment suspension in the rip current was shown to be dependent on the presence of waves. Suspended sediment transport was dominated by the mean flux. The mean flux contributed > 70% of total suspended transport on 19 out of the 27 observed rip current occurrences. The net contribution of the oscillatory flux was small compared to the mean flux. Within the oscillatory component, a frequency domain partitioning routine showed that the VLF motion was an…

Subjects/Keywords: 551.46; Rip current; Sediment Transport; Bedforms; Megaripples; high energy; macro tidal; VLF; Suspended sediment transport

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APA (6^th Edition):

Thorpe, A. (2016). Sediment transport and bedform dynamics in rip currents. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/6558

Chicago Manual of Style (16^th Edition):

Thorpe, Antony. “Sediment transport and bedform dynamics in rip currents.” 2016. Doctoral Dissertation, University of Plymouth. Accessed December 05, 2019. http://hdl.handle.net/10026.1/6558.

MLA Handbook (7^th Edition):

Thorpe, Antony. “Sediment transport and bedform dynamics in rip currents.” 2016. Web. 05 Dec 2019.

Vancouver:

Thorpe A. Sediment transport and bedform dynamics in rip currents. [Internet] [Doctoral dissertation]. University of Plymouth; 2016. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/10026.1/6558.

Council of Science Editors:

Thorpe A. Sediment transport and bedform dynamics in rip currents. [Doctoral Dissertation]. University of Plymouth; 2016. Available from: http://hdl.handle.net/10026.1/6558

University of Edinburgh

5. Gretton, Gareth I. Hydrodynamic analysis of a vertical axis tidal current turbine.

Degree: PhD, 2009, University of Edinburgh

URL: http://hdl.handle.net/1842/3965

► Tidal currents can be used as a predictable source of sustainable energy, and have the potential to make a useful contribution to the energy needs… (more)

▼ Tidal currents can be used as a predictable source of sustainable energy, and have the potential to make a useful contribution to the energy needs of the UK and other countries with such a resource. One of the technologies which may be used to transform tidal power into mechanical power is a vertical axis turbine, the hydrodynamic analysis of which this thesis is concerned with. The aim of this analysis is to gain a better understanding of the power transformation process, from which position there is the possibility of improving the conversion efficiency. A second aim is to compare the results from different modelling approaches. Two types of mathematical modelling are used: a basic blade element momentum model and a more complex Reynolds-averaged Navier Stokes (RANS) model. The former model has been programmed in Matlab by the present author while the latter model uses a commercial computational fluid dynamics (CFD) code, ANSYS CFX. This RANS model uses the SST k-! turbulence model. The CFD analysis of hydrofoils (equally airfoils), for both fixed and oscillating pitch conditions, is a significant proportion of the present work. Such analysis is used as part of the verification and validation of the CFD model of the turbine. It is also used as input to the blade element momentum model, thereby permitting a novel comparison between the blade element momentum model and the CFD model of the turbine. Both types of turbine model were used to explore the variation in turbine efficiency (and other factors) with tip speed ratio and with and without an angle of attack limiting variable pitch strategy. It is shown that the use of such a variable pitch strategy both increases the peak efficiency and broadens the peak. The comparison of the results from the two different turbine modelling approaches shows that when the present CFD hydrofoil results are used as input to the blade element model, and when dynamic effects are small and the turbine induction factor is low, there is generally good agreement between the two models.

Subjects/Keywords: 627; tidal current energy; tidal current turbine; vertical axis turbine; computational fluid dynamics

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APA (6^th Edition):

Gretton, G. I. (2009). Hydrodynamic analysis of a vertical axis tidal current turbine. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/3965

Chicago Manual of Style (16^th Edition):

Gretton, Gareth I. “Hydrodynamic analysis of a vertical axis tidal current turbine.” 2009. Doctoral Dissertation, University of Edinburgh. Accessed December 05, 2019. http://hdl.handle.net/1842/3965.

MLA Handbook (7^th Edition):

Gretton, Gareth I. “Hydrodynamic analysis of a vertical axis tidal current turbine.” 2009. Web. 05 Dec 2019.

Vancouver:

Gretton GI. Hydrodynamic analysis of a vertical axis tidal current turbine. [Internet] [Doctoral dissertation]. University of Edinburgh; 2009. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1842/3965.

Council of Science Editors:

Gretton GI. Hydrodynamic analysis of a vertical axis tidal current turbine. [Doctoral Dissertation]. University of Edinburgh; 2009. Available from: http://hdl.handle.net/1842/3965

University of Colorado

6. Alexander, Spencer R. Computational Modeling of Unsteady Loads in Tidal Boundary Layers.

Degree: MS, Mechanical Engineering, 2014, University of Colorado

URL: http://scholar.colorado.edu/mcen_gradetds/106

► As ocean current turbines move from the design state into production and installation, a better understanding of oceanic turbulent flows and localized loading is… (more)

Subjects/Keywords: ocean current turbine; tidal boundary; large eddy simulations; unsteady loading; energy generation; Energy Systems; Ocean Engineering

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APA (6^th Edition):

Alexander, S. R. (2014). Computational Modeling of Unsteady Loads in Tidal Boundary Layers. (Masters Thesis). University of Colorado. Retrieved from http://scholar.colorado.edu/mcen_gradetds/106

Chicago Manual of Style (16^th Edition):

Alexander, Spencer R. “Computational Modeling of Unsteady Loads in Tidal Boundary Layers.” 2014. Masters Thesis, University of Colorado. Accessed December 05, 2019. http://scholar.colorado.edu/mcen_gradetds/106.

MLA Handbook (7^th Edition):

Alexander, Spencer R. “Computational Modeling of Unsteady Loads in Tidal Boundary Layers.” 2014. Web. 05 Dec 2019.

Vancouver:

Alexander SR. Computational Modeling of Unsteady Loads in Tidal Boundary Layers. [Internet] [Masters thesis]. University of Colorado; 2014. [cited 2019 Dec 05]. Available from: http://scholar.colorado.edu/mcen_gradetds/106.

Council of Science Editors:

Alexander SR. Computational Modeling of Unsteady Loads in Tidal Boundary Layers. [Masters Thesis]. University of Colorado; 2014. Available from: http://scholar.colorado.edu/mcen_gradetds/106

University of Canterbury

7. Jeong, W-J. Tidal Current Energy Resources off the South and West Coastsof Korea: Preliminary Observation-Derived Estimates.

Degree: Geography, 2013, University of Canterbury

URL: http://hdl.handle.net/10092/8349

► In this study we estimate the prospective tidal current energy resources off the south and west coasts of Korea and explore the influence of modeling… (more)

Subjects/Keywords: tidal currents; tidal current energy; perigean and apogean; spring-neap tides; Field of Research::09 - Engineering::0906 - Electrical and Electronic Engineering::090608 - Renewable Power and Energy Systems Engineering (excl. Solar Cells); Field of Research::04 - Earth Sciences::0405 - Oceanography::040599 - Oceanography not elsewhere classified

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APA (6^th Edition):

Jeong, W. (2013). Tidal Current Energy Resources off the South and West Coastsof Korea: Preliminary Observation-Derived Estimates. (Thesis). University of Canterbury. Retrieved from http://hdl.handle.net/10092/8349

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jeong, W-J. “Tidal Current Energy Resources off the South and West Coastsof Korea: Preliminary Observation-Derived Estimates.” 2013. Thesis, University of Canterbury. Accessed December 05, 2019. http://hdl.handle.net/10092/8349.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jeong, W-J. “Tidal Current Energy Resources off the South and West Coastsof Korea: Preliminary Observation-Derived Estimates.” 2013. Web. 05 Dec 2019.

Vancouver:

Jeong W. Tidal Current Energy Resources off the South and West Coastsof Korea: Preliminary Observation-Derived Estimates. [Internet] [Thesis]. University of Canterbury; 2013. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/10092/8349.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jeong W. Tidal Current Energy Resources off the South and West Coastsof Korea: Preliminary Observation-Derived Estimates. [Thesis]. University of Canterbury; 2013. Available from: http://hdl.handle.net/10092/8349

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Exeter

8. Allsop, Steven Christopher. Hydrodynamic modelling for structural analysis of tidal stream turbine blades.

Degree: Thesis (Eng.D.), 2018, University of Exeter

URL: http://hdl.handle.net/10871/33219

► The predictable nature of the tides offers a regular, reliable source of renewable energy that can be harnessed using tidal stream turbines (TSTs). The UK's… (more)

▼ The predictable nature of the tides offers a regular, reliable source of renewable energy that can be harnessed using tidal stream turbines (TSTs). The UK's practically extractable tidal stream energy resource has the potential to supply around 7 % of the country's annual electricity demand. As of 2016, the world's first commercial scale arrays have been deployed around the UK and France. The harsh nature of the marine operating environment poses a number of engineering challenges, where the optimal turbine design solution remains under investigation. In this thesis, a numerical model is developed to assess the power production and hydrodynamic behaviour of horizontal axis tidal turbines. The developed model builds upon well established and computationally efficient Blade Element Momentum Theory (BEMT) method for modern three-bladed wind turbines. The main novel contribution of this thesis is extending the application to an alternative design of a ducted, high solidity and open centre TST. A validation study using measurements from multiple different scale model experimental tank tests has proven the applicability of the model and suitability of the imposed correction factors. The analytical modifications to account for ducted flow were subsequently indirectly verified, where predictions of turbine power and axial thrust forces under optimal operating speeds were within 2 % of those using more advanced computational fluid dynamics (CFD) methods. This thesis presents a commercial application case of two turbines designed by OpenHydro, examining the BEMT performance with a sophisticated blade resolved CFD study. A comparison of results finds that the model is capable of predicting the average peak power to within 12 %, however it under predicts thrust levels by an average of 35 %. This study concludes that the model is applicable to ducted turbine configurations, but is limited in capturing the complex flow interactions towards the open centre, which requires further investigation. The computational efficiency of the newly developed model allowed a structural analysis of the composite blades, thus demonstrating it is suitable to effectively evaluate engineering applications. Stresses are seen to be dominated by flap-wise bending moments, which peak at the mid-length of the blade. This tool will further enable EDF to perform third party assessments of the different turbine designs, to aid decision making for future projects.

Subjects/Keywords: tidal energy; turbine blades; offshore; marine current turbines; hydrodynamics; renewable energy; composite blades; stress analysis; survivability; fatigue; CFD; blade element momentum; BEMT; computational fluid dynamics; openhydro; duct; open centre; tidal; marine; loads; hydrofoil; code_saturne; edf

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APA (6^th Edition):

Allsop, S. C. (2018). Hydrodynamic modelling for structural analysis of tidal stream turbine blades. (Doctoral Dissertation). University of Exeter. Retrieved from http://hdl.handle.net/10871/33219

Chicago Manual of Style (16^th Edition):

Allsop, Steven Christopher. “Hydrodynamic modelling for structural analysis of tidal stream turbine blades.” 2018. Doctoral Dissertation, University of Exeter. Accessed December 05, 2019. http://hdl.handle.net/10871/33219.

MLA Handbook (7^th Edition):

Allsop, Steven Christopher. “Hydrodynamic modelling for structural analysis of tidal stream turbine blades.” 2018. Web. 05 Dec 2019.

Vancouver:

Allsop SC. Hydrodynamic modelling for structural analysis of tidal stream turbine blades. [Internet] [Doctoral dissertation]. University of Exeter; 2018. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/10871/33219.

Council of Science Editors:

Allsop SC. Hydrodynamic modelling for structural analysis of tidal stream turbine blades. [Doctoral Dissertation]. University of Exeter; 2018. Available from: http://hdl.handle.net/10871/33219

Delft University of Technology

9. Taser, S. Market Entry Strategy: The case of Bluewater in tidal current industry:.

Degree: 2011, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:3642b56d-9767-494e-a43b-6e0033824134

Subjects/Keywords: market entry strategy; emerging industry; dominant design,; renewable energy; wind energy; tidal current energy

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APA (6^th Edition):

Taser, S. (2011). Market Entry Strategy: The case of Bluewater in tidal current industry:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3642b56d-9767-494e-a43b-6e0033824134

Chicago Manual of Style (16^th Edition):

Taser, S. “Market Entry Strategy: The case of Bluewater in tidal current industry:.” 2011. Masters Thesis, Delft University of Technology. Accessed December 05, 2019. http://resolver.tudelft.nl/uuid:3642b56d-9767-494e-a43b-6e0033824134.

MLA Handbook (7^th Edition):

Taser, S. “Market Entry Strategy: The case of Bluewater in tidal current industry:.” 2011. Web. 05 Dec 2019.

Vancouver:

Taser S. Market Entry Strategy: The case of Bluewater in tidal current industry:. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2019 Dec 05]. Available from: http://resolver.tudelft.nl/uuid:3642b56d-9767-494e-a43b-6e0033824134.

Council of Science Editors:

Taser S. Market Entry Strategy: The case of Bluewater in tidal current industry:. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:3642b56d-9767-494e-a43b-6e0033824134

University of Otago

10. Lorange, Astrid Marlene Suzanne. Assessing Tidal Current Power Resources .

Degree: University of Otago

URL: http://hdl.handle.net/10523/5538

► Tidal current energy is looked upon worldwide as a largely untapped, potentially significant and reliable source of energy. Countries, such as the United Kingdom and… (more)

Subjects/Keywords: New Zealand; Australia; Norway; UK; United Kingdom; Chili; Japan; Singapore; Ireland; Scotland; USA; America; Canada; Tidal; Power; Tidal Energy; Tidal Power; Tidal Turbine; Seagen; Electricity; Electricity Generation; Tidal Turbine Farm; Site Assessment; Tidal Current Power Resources; Realizable Power; Realisable Power; Tidal Site; Siting

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APA (6^th Edition):

Lorange, A. M. S. (n.d.). Assessing Tidal Current Power Resources . (Masters Thesis). University of Otago. Retrieved from http://hdl.handle.net/10523/5538

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Chicago Manual of Style (16^th Edition):

Lorange, Astrid Marlene Suzanne. “Assessing Tidal Current Power Resources .” Masters Thesis, University of Otago. Accessed December 05, 2019. http://hdl.handle.net/10523/5538.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7^th Edition):

Lorange, Astrid Marlene Suzanne. “Assessing Tidal Current Power Resources .” Web. 05 Dec 2019.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Lorange AMS. Assessing Tidal Current Power Resources . [Internet] [Masters thesis]. University of Otago; [cited 2019 Dec 05]. Available from: http://hdl.handle.net/10523/5538.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Lorange AMS. Assessing Tidal Current Power Resources . [Masters Thesis]. University of Otago; Available from: http://hdl.handle.net/10523/5538

Note: this citation may be lacking information needed for this citation format:
No year of publication.

11. Toupin, Mathieu. Scientific Validation of Standards for Tidal Current Energy Resource Assessment .

Degree: 2016, University of Ottawa

URL: http://hdl.handle.net/10393/34212

► The tidal current energy resource is challenging to assess with accuracy and precision. An accepted standard methodology is lacking, which in turn perpetuates uncertainty and… (more)

▼ The tidal current energy resource is challenging to assess with accuracy and precision. An accepted standard methodology is lacking, which in turn perpetuates uncertainty and hinders the industry’s development. Technical Committee 114 of the International Electro-technical Commission (IEC-TC-114) is working to develop a standard for emerging tidal energy conversion systems. The draft standard prescribes methods for determining, objectively and reliably, the scale and character of tidal current energy resources at a site. The IEC-TC-114 draft standard for tidal energy resource assessment and characterisation has not yet been tested in a real world case study. Hence, it is not yet known whether the proposed methods will yield the desired outcome. This research has adopted the Fundy Ocean Research Center for Energy (FORCE) project in Minas Passage, Nova Scotia, for pilot application of the draft standard on tidal current resource assessment. The Bay of Fundy, located on the Atlantic coast of North America between the Canadian provinces of New Brunswick and Nova Scotia, is known for having the highest tidal range in the world and has long been recognised as an ideal stage for tidal energy development. The thesis is presented in three main parts. Firstly, the latest peer-reviewed scientific literature is summarised and the standard is reviewed in view of lessons learned. The aim of this exercise is to establish a scientific basis for and to develop suggestions towards improving and extending future revisions of the standard. Secondly, a comprehensive assessment of the tidal current energy resource at the FORCE project site is conducted in a manner that is consistent with IEC-TC-114 protocol based on available measurements from static current profiler surveys and a two-dimensional hydrodynamic model of the upper Bay of Fundy developed for this study. Thirdly, a sensitivity analysis is performed to determine the main sources of error and uncertainty affecting resource assessment, a topic which has yet to be addressed in the literature.

Subjects/Keywords: Tidal current resource; Tidal energy; Renewable energy; Numerical model; Bay of Fundy; 2D Hydrodynamic model; Resource assessment

…41 Table 3.2. Validation from recent tidal current energy resource assessments… …of the standard 3. To conduct a comprehensive assessment of the tidal current energy… …tidal current energy resource assessment 1.3. Novelty Tidal energy systems are an emerging… …objectives. Chapter 2 is a review of the state of the art in tidal current energy resource… …114 draft standard for tidal current energy resource assessment and characterisation…

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APA (6^th Edition):

Toupin, M. (2016). Scientific Validation of Standards for Tidal Current Energy Resource Assessment . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/34212

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Toupin, Mathieu. “Scientific Validation of Standards for Tidal Current Energy Resource Assessment .” 2016. Thesis, University of Ottawa. Accessed December 05, 2019. http://hdl.handle.net/10393/34212.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Toupin, Mathieu. “Scientific Validation of Standards for Tidal Current Energy Resource Assessment .” 2016. Web. 05 Dec 2019.

Vancouver:

Toupin M. Scientific Validation of Standards for Tidal Current Energy Resource Assessment . [Internet] [Thesis]. University of Ottawa; 2016. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/10393/34212.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Toupin M. Scientific Validation of Standards for Tidal Current Energy Resource Assessment . [Thesis]. University of Ottawa; 2016. Available from: http://hdl.handle.net/10393/34212

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of British Columbia

12. Li, Ye. Development of a procedure for power generated from a tidal current turbine farm .

Degree: 2008, University of British Columbia

URL: http://hdl.handle.net/2429/2690

► A tidal current turbine is a device functioning in a manner similar to wind turbine for harnessing energy from tidal currents, a group of which… (more)

▼ A tidal current turbine is a device functioning in a manner similar to wind turbine for harnessing energy from tidal currents, a group of which is called a farm. The existing approaches used to predict power from tidal current turbine farms oversimplify the hydrodynamic interactions between turbines, which significantly affects the results. The major focus of this dissertation is to study the relationship between turbine distribution (the relative position of the turbines) and the hydrodynamic interactions between turbines, and its impact on the power from a farm. A new formulation of the discrete vortex method (DVM-UBC) is proposed to describe the behavior of turbines and unsteady flow mathematically, and a numerical model is developed to predict the performance, the unsteady wake and acoustic emission of a stand-alone turbine using DVM-UBC. Good agreement is obtained between the results obtained with DVM-UBC and published numerical and experimental results. Then, another numerical model is developed to predict the performance, wake and acoustic emission of a two-turbine system using DVM-UBC. The results show that the power of a two-turbine system with optimal relative position is about 25% more than two times that of a stand-alone turbine under the same conditions. The torque such a system may fluctuate 50% less than that of a stand-alone turbine. The acoustic emission of such a system may be 35% less than that of a stand-alone turbine. As an extension, a numerical procedure is developed to estimate the efficiency of an N-turbine system by using a linear theory together with the two-turbine system model. By integrating above hydrodynamic models for predicting power and a newly-developed Operation and Maintenance (O&M) model for predicting the cost, a system model is framed to estimate the energy cost using a scenario-based cost-effectiveness analysis. This model can estimate the energy cost more accurately than the previous models because it breaks down turbine’s components and O&M strategies in much greater detail when studying the hydrodynamics and reliability of the turbine. This dissertation provides a design tool for farm planners, and shed light on other disciplines such as environmental sciences and oceanography.

Subjects/Keywords: Discrete vortex method; Energy cost; Environmental impact; Acoustic (noise) emission; Ocean energy; Operation and maintenance; Tidal current turbine

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APA (6^th Edition):

Li, Y. (2008). Development of a procedure for power generated from a tidal current turbine farm . (Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/2690

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Li, Ye. “Development of a procedure for power generated from a tidal current turbine farm .” 2008. Thesis, University of British Columbia. Accessed December 05, 2019. http://hdl.handle.net/2429/2690.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Li, Ye. “Development of a procedure for power generated from a tidal current turbine farm .” 2008. Web. 05 Dec 2019.

Vancouver:

Li Y. Development of a procedure for power generated from a tidal current turbine farm . [Internet] [Thesis]. University of British Columbia; 2008. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/2429/2690.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li Y. Development of a procedure for power generated from a tidal current turbine farm . [Thesis]. University of British Columbia; 2008. Available from: http://hdl.handle.net/2429/2690

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

13. Olczak, Alexander. The influence of waves on tidal stream turbine arrays.

Degree: PhD, 2016, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/the-influence-of-waves-on-tidal-stream-turbine-arrays(3ed6653f-1cc3-4e3b-ba03-5e5094a15ecc).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.694309

► The aim of this research was to quantify the influence of waves on arrays of tidal turbines. Experiments measured the wake of a turbine operating… (more)

▼ The aim of this research was to quantify the influence of waves on arrays of tidal turbines. Experiments measured the wake of a turbine operating in combined wave-current flows, these were found to reduce velocity deficit as opposed to current only flow. The vertical region of the wake affected was dependant on the wave depth parameter, kd.RANS-BEM and Actuator Line methods were implemented within a commercial CFD code to provide computationally efficient methodologies for the simulation of both large turbine arrays and a turbine subjected to unsteady flow. For scaled experiments thrust coefficient was within 7% and 1% of the flume experiments for the RANS-BEM and Actuator Line methods respectively. The methods were found to give good prediction of a single turbine wake at distances greater than four diameters downstream, provided values of inlet turbulence intensity and length scale were equal to those measured experimentally.An unsteady Actuator Line method was used to quantify rotor loads and wake generation for a turbine operating within combined wave-current flow. The use of a streamwise pulsatile flow was found to give similar rotor and blade loads to simulations using a wave in a two phase volume of fluid simulation. The control strategy adopted by the turbine was found to greatly influence the computed rotor loads and blade bending moments. The wake generated by an Actuator Line method showed a reduction in velocity, however this was smaller than that measured experimentally for equivalent wave conditions.The accuracy with which the RANS-BEM method computed turbine loads and wakes was quantified for a number of one, two and three row arrays. The square of the disk averaged velocity encountered by turbines downstream of a single row of five turbines was found to be predicted to within 5% and 28% for an aligned and staggered arrangement respectively. For the two row arrays, the thrust of individual turbines was within 31% of the experimental measurements. The merged wake downstream of the multiple turbines was well predicted.Measurements of the wake of five porous disks showed combined wave-current flow did not alter the wake in the same manner as a single isolated disk. Measurement of wave energy over the wake showed the downstream current field altered wave propagation, causing a reduction in wave energy over the wake but an increase over the bypass flow. The accuracy of the wave model SWAN was assessed for the calculation of this change in wave characteristics. The model gave good prediction of the lateral variation of wave height over the far wake, however discrepancies in the near wake and upstream of the disk occurred.

Subjects/Keywords: 621.406; Tidal Energy; Wave; Current; Renewable Energy; Arrays; CFD; Experiments; Turbulence

…description of the current status of the tidal stream energy industry is given. The broad research… …Marker and Cell. MCT Marine Current Turbines. MEA Marine Energy Atlas. RANS Reynolds Averaged… …current field altered wave propagation, causing a reduction in wave energy over the wake but an… …estimated that tidal energy could provide 20-30 TWh/year (≈ 10% of the 318 TWh electricity… …of fast moving tidal flow for the generation of electricity, known as tidal stream energy…

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APA (6^th Edition):

Olczak, A. (2016). The influence of waves on tidal stream turbine arrays. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/the-influence-of-waves-on-tidal-stream-turbine-arrays(3ed6653f-1cc3-4e3b-ba03-5e5094a15ecc).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.694309

Chicago Manual of Style (16^th Edition):

Olczak, Alexander. “The influence of waves on tidal stream turbine arrays.” 2016. Doctoral Dissertation, University of Manchester. Accessed December 05, 2019. https://www.research.manchester.ac.uk/portal/en/theses/the-influence-of-waves-on-tidal-stream-turbine-arrays(3ed6653f-1cc3-4e3b-ba03-5e5094a15ecc).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.694309.

MLA Handbook (7^th Edition):

Olczak, Alexander. “The influence of waves on tidal stream turbine arrays.” 2016. Web. 05 Dec 2019.

Vancouver:

Olczak A. The influence of waves on tidal stream turbine arrays. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2019 Dec 05]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/the-influence-of-waves-on-tidal-stream-turbine-arrays(3ed6653f-1cc3-4e3b-ba03-5e5094a15ecc).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.694309.

Council of Science Editors:

Olczak A. The influence of waves on tidal stream turbine arrays. [Doctoral Dissertation]. University of Manchester; 2016. Available from: https://www.research.manchester.ac.uk/portal/en/theses/the-influence-of-waves-on-tidal-stream-turbine-arrays(3ed6653f-1cc3-4e3b-ba03-5e5094a15ecc).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.694309

14. Sankaran Iyer, Abhinaya. New methodologies and scenarios for evaluating tidal current energy potential.

Degree: PhD, 2012, University of Edinburgh

URL: http://hdl.handle.net/1842/6182

► Transition towards a low carbon economy raises concerns of loss of security of supply with high penetrations of renewable generation displacing traditional fossil fuel based… (more)

Subjects/Keywords: 621.31; tidal current energy; tidal energy; resource assessment; network integration; site characterisation; demand and supply matching; project and national scale resource assessment

…7 2. Tidal Current Energy… …18 Figure 2.7 Different device configurations used to extract tidal current energy. (… …regions identified to be of interest for tidal current energy development............... 155… …159 6.2.2 Estimation and Validation of Tidal Current Time-Series… …169 6.3.1 First Generation Tidal Current Resource…

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APA (6^th Edition):

Sankaran Iyer, A. (2012). New methodologies and scenarios for evaluating tidal current energy potential. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/6182

Chicago Manual of Style (16^th Edition):

Sankaran Iyer, Abhinaya. “New methodologies and scenarios for evaluating tidal current energy potential.” 2012. Doctoral Dissertation, University of Edinburgh. Accessed December 05, 2019. http://hdl.handle.net/1842/6182.

MLA Handbook (7^th Edition):

Sankaran Iyer, Abhinaya. “New methodologies and scenarios for evaluating tidal current energy potential.” 2012. Web. 05 Dec 2019.

Vancouver:

Sankaran Iyer A. New methodologies and scenarios for evaluating tidal current energy potential. [Internet] [Doctoral dissertation]. University of Edinburgh; 2012. [cited 2019 Dec 05]. Available from: http://hdl.handle.net/1842/6182.

Council of Science Editors:

Sankaran Iyer A. New methodologies and scenarios for evaluating tidal current energy potential. [Doctoral Dissertation]. University of Edinburgh; 2012. Available from: http://hdl.handle.net/1842/6182

15. Xin, Bai. Numerical simulation of a marine current turbine in turbulent flow.

Degree: PhD, 2014, Queen Mary, University of London

URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/7900 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658662

► The marine current turbine (MCT) is an exciting proposition for the extraction of renewable tidal and marine current power. However, the numerical prediction of the… (more)

Subjects/Keywords: 532; marine current turbines; marine current power.; turbulent flow; Large Eddy Simulation; turbulence modelling; renewable energy; tidal power; Fluid-structure interaction;

…operated. Tidal current energy is very site specific, optimised only where tidal range is… …204 9 Table of Figures Figure 1.1 Examples of four different types of Tidal Energy… …the renewable energy sources, tidal power has the distinct advantage of being highly… …predictable compared with some other forms (solar and wind energy etc) which gives tidal… …for the extraction of tidal and marine current power that has recently gained momentum as a…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Xin, B. (2014). Numerical simulation of a marine current turbine in turbulent flow. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/7900 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658662

Chicago Manual of Style (16^th Edition):

Xin, Bai. “Numerical simulation of a marine current turbine in turbulent flow.” 2014. Doctoral Dissertation, Queen Mary, University of London. Accessed December 05, 2019. http://qmro.qmul.ac.uk/xmlui/handle/123456789/7900 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658662.

MLA Handbook (7^th Edition):

Xin, Bai. “Numerical simulation of a marine current turbine in turbulent flow.” 2014. Web. 05 Dec 2019.

Vancouver:

Xin B. Numerical simulation of a marine current turbine in turbulent flow. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2014. [cited 2019 Dec 05]. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/7900 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658662.

Council of Science Editors:

Xin B. Numerical simulation of a marine current turbine in turbulent flow. [Doctoral Dissertation]. Queen Mary, University of London; 2014. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/7900 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658662

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