Accuracy and consistency of CFD and engineering models for simulating vertical axis wind turbine loads

Galih Bangga , Amgad Dessoky , Zhenlong Wu , Krzysztof Rogowski , Martin O.L. Hansen

Abstract

The present work is intended to assess the ability of state-of-the-art approaches with various fidelity levels for accurate load predictions on vertical axis wind turbines (VAWT). The assessments are conducted by employing the Double-Multiple-Streamtube (DMS), Improved-DMS (IDMS), Unsteady Blade Element Momentum (UBEM), Vortex Model and fully resolved computational fluid dynamics (CFD) approaches. For the later case, three different codes are employed, namely FLOWer, TAU and Ansys Fluent. Three different turbines from low up to high rotor solidity (0.23, 0.53 and 1.325) are selected as the case studies. The prediction results are compared with experimental data at various operating ranges in terms of integral and azimuthal loads. The studies demonstrate that there is consistent agreement between engineering models at lightly loaded cases for the power curve prediction. The discrepancy at high tip speed ratio (λ) is caused by wake expansion, unsteady and decambering effects. In contrast, CFD predictions hardly show consistent power prediction but deliver accurate thrust values.
Author Galih Bangga - [Universitat Stuttgart]
Galih Bangga,,
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, Amgad Dessoky - [Universitat Stuttgart]
Amgad Dessoky,,
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, Zhenlong Wu - [Universitat Stuttgart]
Zhenlong Wu,,
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, Krzysztof Rogowski (FPAE / IAAM)
Krzysztof Rogowski,,
- The Institute of Aeronautics and Applied Mechanics
, Martin O.L. Hansen - [Danmarks Tekniske Universitet]
Martin O.L. Hansen,,
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Journal seriesEnergy, ISSN 0360-5442, e-ISSN 1873-6785
Issue year2020
Vol206
ASJC Classification2100 General Energy; 2310 Pollution
Abstract in original languageThe present work is intended to assess the ability of state-of-the-art approaches with various fidelity levels for accurate load predictions on vertical axis wind turbines (VAWT). The assessments are conducted by employing the Double-Multiple-Streamtube (DMS), Improved-DMS (IDMS), Unsteady Blade Element Momentum (UBEM), Vortex Model and fully resolved computational fluid dynamics (CFD) approaches. For the later case, three different codes are employed, namely FLOWer, TAU and Ansys Fluent. Three different turbines from low up to high rotor solidity (0.23, 0.53 and 1.325) are selected as the case studies. The prediction results are compared with experimental data at various operating ranges in terms of integral and azimuthal loads. The studies demonstrate that there is consistent agreement between engineering models at lightly loaded cases for the power curve prediction. The discrepancy at high tip speed ratio (λ) is caused by wake expansion, unsteady and decambering effects. In contrast, CFD predictions hardly show consistent power prediction but deliver accurate thrust values.
DOIDOI:10.1016/j.energy.2020.118087
URL https://www.sciencedirect.com/science/article/abs/pii/S0360544220311944
Languageen angielski
Score (nominal)200
Score sourcejournalList
ScoreMinisterial score = 200.0, 19-08-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.822; WoS Impact Factor: 2018 = 5.537 (2) - 2018=5.747 (5)
Citation count*1 (2020-09-16)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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