Design Consideration of Novel Dual Integrated Rotor-Stator System with Double Layered V-Shaped Magnetic Pole Six-Phase PMSG for Tidal Energy Extraction

2021 ◽  
Author(s):  
Raja Ram Kumar ◽  
Ankita Kumari ◽  
Ruchika Paul ◽  
Jayashree Sarma ◽  
Chandan Chetri ◽  
...  
Keyword(s):  
Tidal Energy ◽  
Design Consideration ◽  
Energy Extraction ◽  
Magnetic Pole

Simulation of Tidal Energy Extraction by Using FLUENT Model

2019 ◽  
Vol 43 (4) ◽  
pp. 2035-2042
Author(s):  
F. Hosseinibalam ◽  
S. Hassanzadeh ◽  
M. Mirmohammadi
Keyword(s):  
Tidal Energy ◽  
Energy Extraction

scholarly journals Modeling Assessment of Tidal Energy Extraction in the Western Passage

2020 ◽  
Vol 8 (6) ◽  
pp. 411
Author(s):  
Zhaoqing Yang ◽  
Taiping Wang ◽  
Ziyu Xiao ◽  
Levi Kilcher ◽  
Kevin Haas ◽  
...  
Keyword(s):  
Cross Sections ◽  
Numerical Models ◽  
Three Dimensional ◽  
Energy Resource ◽  
Field Measurements ◽  
Tidal Energy ◽  
Resource Assessment ◽  
Ocean Model ◽  
Energy Extraction ◽  
Technical Specifications

Numerical models have been widely used for the resource characterization and assessment of tidal instream energy. The accurate assessment of tidal stream energy resources at a feasibility or project-design scale requires detailed hydrodynamic model simulations or high-quality field measurements. This study applied a three-dimensional finite-volume community ocean model (FVCOM) to simulate the tidal hydrodynamics in the Passamaquoddy–Cobscook Bay archipelago, with a focus on the Western Passage, to assist tidal energy resource assessment. IEC Technical specifications were considered in the model configurations and simulations. The model was calibrated and validated with field measurements. Energy fluxes and power densities along selected cross sections were calculated to evaluate the feasibility of the tidal energy development at several hotspots that feature strong currents. When taking both the high current speed and water depth into account, the model results showed that the Western Passage has great potential for the deployment of tidal energy farms. The maximum extractable power in the Western Passage was estimated using the Garrett and Cummins method. Different criteria and methods recommended by the IEC for resource characterization were evaluated and discussed using a sensitivity analysis of energy extraction for a hypothetical tidal turbine farm in the Western Passage.

scholarly journals Simulation of Tidal Energy Extraction, Using Fluent Model

2020 ◽  
Vol 160 ◽  
pp. 02002
Author(s):  
Hamidreza Alizadeh Hamedani
Keyword(s):  
Energy Dissipation ◽  
Water Surface ◽  
Tidal Flow ◽  
Free Water ◽  
Tidal Energy ◽  
Numerical Results ◽  
Energy Extraction ◽  
Flow Acceleration ◽  
Free Water Surface ◽  
Fluent Software

This study has been performed to develop our knowledge about marine sources energy extraction. Water in the channel has been simulated in laboratory scale by means of FLUENT software. The turbine tidal flow is generated by a moving disk which applies a pressure decrement with energy dissipation. Free water surface is estimated by means of fluid volume in the model which changes freely. The numerical results illustrate that eddy sequence has been generated after the tidal flow of turbine and a flow acceleration is generated nearby, especially beneath the energy extraction devise. Free water surface drop due to energy extraction is considered in model results that seems a to improve the turbine eddy sequence.

Numerical Models as Enabling Tools for Tidal-Stream Energy Extraction and Environmental Impact Assessment

2016 ◽  
Author(s):  
Zhaoqing Yang ◽  
Taiping Wang
Keyword(s):  
Water Quality ◽  
Unstructured Grid ◽  
Puget Sound ◽  
Tidal Energy ◽  
Ocean Model ◽  
Energy Extraction ◽  
Volume Flux ◽  
Quality Model ◽  
Flushing Time ◽  
Tidal Turbine

This paper presents a modeling study conducted to evaluate tidal-stream energy extraction and its associated potential environmental impacts using a three-dimensional unstructured-grid coastal ocean model, which was coupled with a water-quality model and a tidal-turbine module. The unstructured-grid tidal-turbine model was first applied to investigate the effects of different tidal farm configurations on tidal energy extraction and the effects on the system flow field as well as biogeochemical transport processes in an idealized bay with a narrow channel connecting to the coastal ocean. Model results indicated that a large number of turbines are required to extract the maximum tidal energy and cause significant reduction in the volume flux. Model results also showed that tidal energy extraction has a greater effect on flushing time than on volume flux reduction. In the idealized tidal channel, a 10% reduction of volume flux caused by tidal energy extraction would result in an approximately 50% increase in flushing time in the bay. The flushing time increases exponentially as a function of flow reduction. A water-quality model simulation was conducted to investigate the dynamic effect of tidal energy extraction on water quality in a stratified tidal channel and estuary system. Model results showed that deployment of tidal turbines in the channel would increase vertical mixing in the bay. However, extraction of tidal energy also would result in a decrease in bottom dissolved oxygen in the bay during summer, which may cause hypoxia in fish. Finally, the tidal-turbine model was applied to a real-world site in Puget Sound — a highly energetic estuary on the US Pacific Northwest coast. The model application of tidal energy extraction in Puget Sound demonstrated the advantage of using an unstructured-grid modeling approach with high grid resolution near the tidal-turbine farm within a large model domain. This study showed that a numerical model can be a useful tool for assessing tidal energy extraction and its environmental impacts and for informing regulatory and policy processes for tidal energy development.

Effects on hydrodynamics and ecological costs of climate change and tidal stream energy extraction in a shelf sea

2020 ◽  
Author(s):  
Michela De Dominicis ◽  
Judith Wolf ◽  
Dina Sadykova ◽  
Beth Scott ◽  
Alexander Sadykov ◽  
...  
Keyword(s):  
Climate Change ◽  
Large Scale ◽  
Climate Scenario ◽  
Tidal Energy ◽  
Ocean Model ◽  
Future Climate ◽  
Biogeochemical Model ◽  
Energy Extraction ◽  
Shelf Sea ◽  
Tidal Stream

<p>The aim of this work is to analyse the potential impacts of tidal energy extraction on the marine environment. We wanted to put them in the broader context of the possibly greater and global ecological threat of climate change. Here, we present how very large (hypothetical) tidal stream arrays and a ''business as usual'' future climate scenario can change the hydrodynamics of a seasonally stratified shelf sea, and consequently modify ecosystem habitats and animals’ behaviour.</p><p>The Scottish Shelf Model, an unstructured grid three-dimensional ocean model, has been used to reproduce the present and the future state of the NW European continental shelf. While the marine biogeochemical model ERSEM (European Regional Seas Ecosystem Model) has been used to describe the corresponding biogeochemical conditions. Four scenarios have been modelled: present conditions and projected future climate in 2050, each with and without very large scale tidal stream arrays in Scottish Waters (UK). This allows us to evaluate the potential effect of climate change and large scale energy extraction on the hydrodynamics and biogeochemistry. We found that climate change and tidal energy extraction both act in the same direction, in terms of increasing stratification due to warming and reduced mixing, however, the effect of climate change is ten times larger. Additionally, the ecological costs and benefits of these contrasting pressures on mobile predator and prey marine species are evaluated using ecological statistical models.</p>

Implementation of Tidal Stream Turbines and Tidal Barrage Structures in DG-SWEM

2019 ◽  
Author(s):  
Andrea M. Schnabl ◽  
Tulio Marcondes Moreira ◽  
Dylan Wood ◽  
Ethan J. Kubatko ◽  
Guy T. Houlsby ◽  
...  
Keyword(s):  
Numerical Models ◽  
Shallow Water Equation ◽  
Tidal Energy ◽  
Head Loss ◽  
Equation Model ◽  
Energy Extraction ◽  
Tidal Hydrodynamics ◽  
Low Head ◽  
Tidal Stream ◽  
Two Sides

Abstract There are two approaches to extracting power from tides — either turbines are placed in areas of strong flows or turbines are placed in barrages enabling the two sides of the barrage to be closed off and a head to build up across the barrage. Both of these energy extraction approaches will have a significant back effect on the flow, and it is vital that this is correctly modelled in any numerical simulation of tidal hydrodynamics. This paper presents the inclusion of both tidal stream turbines and tidal barrages in the depth-averaged shallow water equation model DG-SWEM. We represent the head loss due to tidal stream turbines as a line discontinuity — thus we consider the turbines, and the energy lost in local wake-mixing behind the turbines, to be a sub-grid scale processes. Our code allows the inclusion of turbine power and thrust coefficients which are dependent on Froude number, turbine blockage, and velocity, but can be obtained from analytical or numerical models as well as experimental data. The barrage model modifies the existing culvert model within the code, replacing the original cross-barrier pipe equations. At the location of this boundary, velocities through sluice gates are calculated according to the orifice equation. For simulating the turbines, a Hill Chart for low head bulb turbines provided by Andritz Hydro is used. We demonstrate the implementations on both idealised geometries where it is straightforward to compare against other models and numerical simulations of real candidate sites for tidal energy in Malaysia and the Bristol Channel.

scholarly journals Numerical modelling of hydrodynamics and tidal energy extraction in the Alderney Race: a review

2020 ◽  
Vol 378 (2178) ◽  
pp. 20190498
Author(s):  
Jérôme Thiébot ◽  
D. S. Coles ◽  
Anne-Claire Bennis ◽  
Nicolas Guillou ◽  
Simon Neill ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Three Dimensional ◽  
Energy Resource ◽  
Tidal Energy ◽  
Resource Assessment ◽  
Spatial Modelling ◽  
Optimization Techniques ◽  
Energy Extraction ◽  
Model Case ◽  
Eddy Simulation

The tides are a predictable, renewable, source of energy that, if harnessed, can provide significant levels of electricity generation. The Alderney Race (AR), with current speeds that exceed 5 m s −1 during spring tides, is one of the most concentrated regions of tidal energy in the world, with the upper-bound resource estimated at 5.1 GW. Owing to its significance, the AR is frequently used for model case studies of tidal energy conversion, and here we review these model applications and outcomes. We examine a range of temporal and spatial modelling scales, from regional models applied to resource assessment and characterization, to more detailed models that include energy extraction and array optimization. We also examine a range of physical processes that influence the tidal energy resource, including the role of waves and turbulence in tidal energy resource assessment and loadings on turbines. The review discusses model validation, and covers a range of numerical modelling approaches, from two-dimensional to three-dimensional tidal models, two-way coupled wave-tide models, Large Eddy Simulation (LES) models, and the application of optimization techniques. The review contains guidance on model approaches and sources of data that can be used for future studies of the AR, or translated to other tidal energy regions. This article is part of the theme issue ‘New insights on tidal dynamics and tidal energy harvesting in the Alderney Race’.

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