A numerical analysis of power efficiency of wind rotor systems in a parallel matrix

Jia Shiuan Feng, Chin Lien Tseng, Chiun-Hsun Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


This research employs the computational fluid dynamics (CFD) software Fluent to analyze the flow fields around two-blade Savonius wind rotors and their corresponding performances. It utilizes the moving mesh method to simulate the rotating wind rotors in both 2D and 3D transient systems. The study is divided into two topics: a study of a single Savonius wind rotor and a study of a parallel matrix system. The simulation results show that the performance of the wind rotor in the atmosphere is lower than that inside the wind tunnel due to the effect of wind tunnel walls. In the 2D simulation results of the parallel matrix system, the best power coefficient (c p) can be obtained with a phase-angle difference of 90 deg, which is 2.05 times of that of a single wind rotor. The improved performance from the parallel matrix system is due to the positive interaction between the Savonius wind rotors, and the flow fluctuation has a major contribution to the positive interaction. However, this effect is strongly influenced by the change in wind direction. When the wind direction is 45 deg, the c p of the parallel matrix system becomes almost the same or even lower than that of a single rotor. The maximum c p in the parallel matrix system according to the 3D simulation is ∼1.45 times that of a single Savonius wind rotor. The ratio of 2D to 3D c p is 1.28 in the single Savonius wind rotor condition and 1.83 in the parallel matrix system.

Original languageEnglish
Pages (from-to)243-262
Number of pages20
JournalComputational Thermal Sciences
Issue number3
StatePublished - 26 Sep 2012


  • Power coefficient parallel matrix system
  • Savonius wind rotor

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