A5082923417- Wind Energy Research and Development
- Cavitation Phenomena in Pumps
- Wave and Wind Energy Systems
- Turbomachinery Performance and Optimization
- Wind and Air Flow Studies
- Fluid Dynamics and Turbulent Flows
- Advanced Power Generation Technologies
- Hydrology and Sediment Transport Processes
- Reservoir Engineering and Simulation Methods
- Global Energy and Sustainability Research
- Engineering Diagnostics and Reliability
- Flood Risk Assessment and Management
- Marine and Offshore Engineering Studies
- Fluid Dynamics and Vibration Analysis
- Ship Hydrodynamics and Maneuverability
- Water-Energy-Food Nexus Studies
- Hydraulic flow and structures
University of Manchester
2017-2025
University of Bath
2023
Université Le Havre Normandie
2023
Centre National de la Recherche Scientifique
2023
Swansea University
2023
University of Hull
2023
Mechanical Design (Slovakia)
2023
Universidade de São Paulo
2023
University of Oxford
2023
To design tidal stream turbine arrays, wakes need to be fully characterized assess the adequate row spacing considering environmental factors such as onset turbulence, velocity shear, and surface waves. The role of waves on wake development varies depending their characteristics, wavelength amplitude, needs carefully understood. Here large-eddy simulations are performed analyze instantaneous time-averaged characteristics developed downstream a for four wave-current conditions ranging from...
Tidal sites can present uneven seabed bathymetry features that induce favourable or adverse pressure gradients and are sources of turbulence, so likely to affect the operation, performance, wake recovery dynamics deployed tidal-stream turbines. Large-eddy simulations conducted analyse unsteady loading a tidal turbine subjected an upstream interacts with two-dimensional ridge located between two Relative isolated turbine, blade fatigue is increased by up 43% when subject 8 diameters...
Abstract To maximise the availability of power extraction from a tidal stream site, turbines need to be able operate reliably when located within arrays. This requires thorough understanding operating conditions, which include turbulence, velocity shear due bed proximity and roughness, ocean waves upstream turbine wakes, over range flow speeds that contribute loading experienced by devices. High-fidelity models such as Large Eddy Simulation (LES) can used represent these complex conditions...
Understanding the impact of bathymetry features on wake and loading a tidal stream turbine is crucial to inform deployment farms. This study investigates influence Gaussian ridge single diameter (D) using high-fidelity large-eddy simulations. The height 0.33D locations at centre six upstream downstream distances are analysed. analysis elucidates important role recovery fatigue design providing valuable insight for real-world planning arrays. rate increased both beyond 1.5D due favourable...
A blade element model is developed to include unsteady lift and drag coefficients it shown that this provides improved prediction of the spectrum root bending moment a tidal turbine for two definitions onset turbulence. Computational Fluid Dynamics (CFD) used forces on 2D aerofoil using relative flow from different turbulence generation methods. Inclusion magnitude high frequency fluctuations within load spectra, results in an increased number cycles improves Damage Equivalent Load (DEL)....
This work determines the variation in fatigue loading on a tidal turbine at two depth positions and different locations within site. Site data were obtained European Marine Energy Centre, EMEC, test facility Scotland, which has been compiled University of Edinburgh. The modelled is 18m Diameter DEEP-gen 1MW horizontal axis turbine. A blade element method combined with synthetic turbulence inflow to determine forces along over period five cycles. focus establishing difference between loads...
The tidal turbine benchmarking project, funded by the UK's EPSRC and Supergen ORE Hub, has conducted a large laboratory scale experiment on highly instrumented 1.6m diameter rotor. is for measurement of spanwise distributions flapwise edgewise bending moments using strain gauges fibre Bragg optical system, as well overall rotor torque thrust. was tested in well-defined flow conditions, including grid-generated freestream turbulence, towed through 12.2m wide, 5.4m deep long towing tank at...
Micro-siting tidal stream turbines in a confined seabed area requires extensive understanding of the flow dynamics over water column at turbine deployment locations so that operating conditions are assessed, wake effects can be estimated to infer energy yield [1], or bathymetry quantified. Tidal currents have advantage being highly predictable and mostly bidirectional but uneven found most sites introduces high variability within relatively short distances. Considering future arrays will...
This paper presents the first blind prediction stage of Tidal Turbine Benchmarking Project being conducted and funded by UK's EPSRC Supergen ORE Hub. In this stage, only steady flow conditions, at low elevated turbulence (3.1%) levels, were considered. Prior to a large laboratory scale experiment was in which highly instrumented 1.6m diameter tidal rotor towed through towing tank well-defined conditions with without an upstream grid. Details test campaign design released as part community...
The next stage of development the tidal stream industry will see a focus on deployment turbines in arrays increasing device numbers and rated power. Successful array requires thorough understanding resource within potential sites. This is predictable terms flow speeds, based upon constituents. However, operating environment for turbine more complex than experiencing uniform flow, with turbulence, shear wave conditions all affecting loading components. study establishes accuracy which several...
The interest in this work is understanding the conditions which contribute to cyclic loading experienced by a tidal turbine. Tidal turbines are placed locations with high flow speeds order extract maximum kinetic energy. These combined other environmental factors can lead complex operating conditions. When assessing turbine across site, most models use ambient conditions, very few codes including impact of waves currents. Previous studies have analysed influence wave from measurements on...
Tidal stream turbines are now being developed for array deployments, largely at sites with relatively shallow water depths on either bed-supported, or floating support structures. Proximity to the free-surface presents design challenges increased exposure wave-induced kinematics leading potential peak- and fatigue-loads. Free surface proximity can also alter wake recovery rates which influence siting, operation, of further turbines. To-date impact waves turbine loading has receivedlimited...
Site development for tidal turbines relies upon a good understanding of the onset flow conditions, with disk averaged velocity typically used as reference to define turbine power and mean loading. This work investigates variation conditions which occur same velocity. Analysis builds data previously acquired during measurement campaign conducted ReDAPT project using bed mounted ADCPs \cite{Sellar2018}. These measurements turbulence characteristics vertical shear profiles over rotor plane are...
At present tidal stream turbines are commonly deployed in relatively shallow waters that enable quick operations with maintenance at a low cost.The environmental flow conditions such sites is mainly driven by turbulence from the free-stream or induced irregular bathymetry features, and waves can feature breadth of wavelengths periods [1].Depending on wave nature both turbine loads wake recovery notably change, which needs to be understood so future arrays optimally designed.We have conducted...
Fast tidal currents are generally found in shallow water depths where turbines can be deployed to operate. In complex environments which there is an irregular bathymetry, seabed shape changes induce pressure gradients that accelerate or decelerate the flow depending on slope and relative depth, affecting turbine wake recovery. this study, a laboratory scale turbine, represented numerically using Actuator Line Method (ALM), computed Large-Eddy Simulations (LES) over flat-bed presence of three...