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Comparison study of URANS and hybrid RANS-LES models on predicting vertical axis wind turbine performance at low, medium and high tip speed ratio ranges

Syawitri, T. P.; Yao, Y. F.; Chandra, B.; Yao, J.

Authors

T. P. Syawitri

Yufeng Yao Yufeng.Yao@uwe.ac.uk
Professor in Aerospace Engineering

Budi Chandra Budi.Chandra@uwe.ac.uk
Senior Lecturer in Aerospace Engineering



Contributors

Taurista Perdana Syawitri
Researcher

Abstract

Comparison study of unsteady Reynolds-averaged Navier-Stokes (URANS) and hybrid RANS-LES models is carried out for predicting the performance of three-straight-bladed vertical axis wind turbine operating within tip speed ratios (TSRs) ranges of (1.44–3.3). The evaluation is focused on power coefficient, moment coefficient and vortex structure generation, growth and transportation predictions. It was found that URANS turbulence modelling is sufficient for averaged power coefficient prediction and specific range of TSR evaluation, and it also benefits from short simulation run time. To further evaluate flow field details and to understand the underlying flow physics such as dynamic stall behaviour, hybrid RANS-LES turbulence modelling is necessary. Comparing between hybrid models adopted, stress-blended eddy simulation based on transition shear-stress transport (TSST) model has achieved an overall better performance, such as a reduction of simulation discrepancy by 50% in low TSRs range compared to TSST turbulence model. In both medium and high TSRs ranges, the modelling discrepancies are less than 3% compared to TSST turbulence models at about 25% extra computational time. Furthermore, in high TSRs range, hybrid RANS-LES models are able to predict the appearance of vortex shedding at high azimuthal angles (θ ≥ 180°) for which URANS models failed to capture.

Citation

Syawitri, T. P., Yao, Y. F., Chandra, B., & Yao, J. (2021). Comparison study of URANS and hybrid RANS-LES models on predicting vertical axis wind turbine performance at low, medium and high tip speed ratio ranges. Renewable Energy, 168, 247-269. https://doi.org/10.1016/j.renene.2020.12.045

Journal Article Type Article
Acceptance Date Dec 4, 2020
Online Publication Date Dec 15, 2020
Publication Date May 1, 2021
Deposit Date Apr 15, 2021
Publicly Available Date Dec 16, 2021
Journal Renewable Energy
Print ISSN 0960-1481
Electronic ISSN 1879-0682
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 168
Pages 247-269
DOI https://doi.org/10.1016/j.renene.2020.12.045
Keywords Renewable Energy, Sustainability and the Environment
Public URL https://uwe-repository.worktribe.com/output/7260499
Additional Information This article is maintained by: Elsevier; Article Title: Comparison study of URANS and hybrid RANS-LES models on predicting vertical axis wind turbine performance at low, medium and high tip speed ratio ranges; Journal Title: Renewable Energy; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.renene.2020.12.045; Content Type: article; Copyright: © 2020 Elsevier Ltd. All rights reserved.