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Article

Numerical Study of the Dynamic Stall Effect on a Pair of Cross-Flow Hydrokinetic Turbines and Associated Torque Enhancement Due to Flow Blockage

Department of Mechanical Engineering, Keio University, Yokohama 223-8522, Japan
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Author to whom correspondence should be addressed.
Academic Editor: Spyros A. Mavrakos
J. Mar. Sci. Eng. 2021, 9(8), 829; https://doi.org/10.3390/jmse9080829
Received: 12 June 2021 / Revised: 21 July 2021 / Accepted: 27 July 2021 / Published: 30 July 2021
(This article belongs to the Section Ocean Engineering)
An open-source 2D Reynolds-averaged Navier–Stokes (RANS) simulation model was presented and applied for a laboratory-scaled cross-flow hydrokinetic turbine and a twin turbine system in counter-rotating configurations. The computational fluid dynamics (CFD) model was compared with previously published experimental results and then used to study the turbine power output and relevant flow fields at four blockage ratios. The dynamic stall effect and related leading edge vortex (LEV) structures were observed, discussed, and correlated with the power output. The results provided insights into the blockage effect from a different perspective: The physics behind the production and maintenance of lift on the turbine blade at different blockage ratios. The model was then applied to counter-rotating configurations of the turbines and similar analyses of the torque production and maintenance were conducted. Depending on the direction of movement of the other turbine, the blade of interest could either produce higher torque or create more energy loss. For both of the scenarios where a blade interacted with the channel wall or another blade, the key behind torque enhancement was forcing the flow through its suction side and manipulating the LEV. View Full-Text
Keywords: cross-flow turbine; vertical-axis; marine hydrokinetic; counter-rotating; computational fluid dynamics; RANS; water tunnel cross-flow turbine; vertical-axis; marine hydrokinetic; counter-rotating; computational fluid dynamics; RANS; water tunnel
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MDPI and ACS Style

Doan, M.N.; Obi, S. Numerical Study of the Dynamic Stall Effect on a Pair of Cross-Flow Hydrokinetic Turbines and Associated Torque Enhancement Due to Flow Blockage. J. Mar. Sci. Eng. 2021, 9, 829. https://doi.org/10.3390/jmse9080829

AMA Style

Doan MN, Obi S. Numerical Study of the Dynamic Stall Effect on a Pair of Cross-Flow Hydrokinetic Turbines and Associated Torque Enhancement Due to Flow Blockage. Journal of Marine Science and Engineering. 2021; 9(8):829. https://doi.org/10.3390/jmse9080829

Chicago/Turabian Style

Doan, Minh N., and Shinnosuke Obi. 2021. "Numerical Study of the Dynamic Stall Effect on a Pair of Cross-Flow Hydrokinetic Turbines and Associated Torque Enhancement Due to Flow Blockage" Journal of Marine Science and Engineering 9, no. 8: 829. https://doi.org/10.3390/jmse9080829

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