References References: (1) Qing Xiao, Wendi Liu and Jianxin Hu. Parametric study on a cylinder drag reduction using downstream undulating foil. European Journal of Mechanics-B/Fluids, 2012, 36, 48-62. (2) Qing Xiao, Wendi Liu and Atilla Incecik. Flow control for VATT by fixed and oscillating flap. Renewable Energy, 2013, 51, 141-152. (3) Wendi Liu, Qing Xiao and Fai Cheng. A bio-inspired study on tidal energy extraction with flexible flapping wings. Bio-inspiration & Bio-mimetics, 2013, 8, 036011.