Modelling impacts of tidal stream turbines on surface waves

RENEWABLE ENERGY

卷:130

Article

Li, Xiaorong^1,2  Li, Ming²  Jordan, Laura-Beth³  McLelland, Stuart³  Parsons, Daniel R.³  Amoudry, Laurent O.⁴  Song, Qingyang⁵  Comerford, Liam⁶ 

[1] Univ Liverpool, Sch Environm Sci, Liverpool L69 7ZT, Merseyside, England

[2] Univ Liverpool, Sch Engn, Liverpool L69 3CQ, Merseyside, England

[3] Univ Hull, Sch Environm Sci, Cottingham Rd, Kingston Upon Hull HU6 7RX, N Humberside, England

[4] Natl Oceanog Ctr, Joseph Proudman Bldg,6 Brownlow St, Liverpool L3 5DA, Merseyside, England

[5] Christian Albrechts Univ Kiel, FTZ Westkste Coastal Res Lab, Kiel, Germany

[6] Univ Liverpool, Inst Risk & Uncertainty, Liverpool L69 3GH, Merseyside, England

关键词: Tidal stream energy;    Oceanographic model;    Wave-current coupling;    Bottom shear stress;   

DOI  :  10.1016/j.renene.2018.05.098

来源: Elsevier

【 摘 要 】

A high resolution Computational Flow Dynamics (CFD) numerical model is built based on a laboratory experiment in this research to study impacts of tidal turbines on surface wave dynamics. A reduction of similar to 3% in wave height is observed under the influence of a standalone turbine located 0.4 m from the free surface. The artificial wave energy dissipation routine 'OBSTACLE' within FVCOM is shown to effectively capture the correct level of wave height reduction, reproducing the CFD results with significantly less computational effort. The turbine simulation system is then applied to a series of test cases to investigate impact of a standalone turbine on bed shear stress. Results suggest an apparent increase in bed stress (similar to 7%) up-stream of the turbine due to the inclusion of surface waves. However, in the immediate wake of the turbine, bed stress is dominated by the presence of the turbine itself, accounting for a similar to 50% increase, with waves having a seemingly negligible effect up to 9D (D is the turbine diameter) downstream of the turbine. Beyond this point, the effect of waves on bed shear stress become apparent again. The influence of OBSTACLE on bed stress is also noticeable in the far wake, showing a reduction of similar to 2% in wave height. (C) 2018 Elsevier Ltd. All rights reserved.

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