Ouro, P;
Stoesser, T;
(2017)
An immersed boundary-based large-eddy simulation approach to predict the performance of vertical axis tidal turbines.
Computers & Fluids
, 152
pp. 74-87.
10.1016/j.compfluid.2017.04.003.
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Abstract
Vertical axis tidal turbines (VATTs) are perceived to be an attractive alternative to their horizontal axis counterparts in tidal streams due to their omni-directionality. The accurate prediction of VATTs demands a turbulence simulation approach that is able to predict accurately flow separation and vortex shedding and a numerical method that can cope with moving boundaries. Thus, in this study an immersed boundary-based large-eddy simulation (LES-IB) method is refined to allow accurate simulation of the blade vortex interaction of VATTs. The method is first introduced and validated for a VATT subjected to laminar flow. Comparisons with highly-accurate body-fitted numerical models results demonstrate the method’s ability of reproducing accurately the performance and fluid mechanics of the chosen VATT. Then, the simulation of a VATT under turbulent flow is performed and comparisons with data from experiments and results from RANS-based models demonstrate the accuracy of the method. The vortex-blade interaction is visualised for various tip speed ratios and together with velocity spectra detailed insights into the fluid mechanics of VATTs are provided.
| Type: | Article |
|---|---|
| Title: | An immersed boundary-based large-eddy simulation approach to predict the performance of vertical axis tidal turbines |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.compfluid.2017.04.003 |
| Publisher version: | https://doi.org/10.1016/j.compfluid.2017.04.003 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Technology, Computer Science, Interdisciplinary Applications, Mechanics, Computer Science, Vertical axis turbines, Immersed boundary method, Large-eddy simulation, Direct forcing, Tidal turbines, Vortex-blade interaction, WIND TURBINE, BUBBLE PLUMES, CHANNEL FLOW, GENERATION, ROUGHNESS, SCHEMES, SQUARE, MODELS, PITCH, LES |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10057981 |
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