Effects of free surface on a flapping-foil based ocean current energy extractor

Principal Parameters Analysis of the Double-Elastic-Constrained Flapping Hydrofoil for Tidal Current Energy Extraction

“…Therefore, in order to give consideration to both computational efficiency and mesh refinement, Mesh 2's scheme is selected for subsequent simulation in this paper. To provide further validation of the numerical method, a study of the double-elasticconstrained flapping hydrofoil was conducted to directly compare with the previous work of Boudreau [24]. The airfoil used in the experiment is NACA0015, the chord length is 50 mm, and the experiment is completed in a water tank with an incoming flow velocity of 0.38 m/s.…”

“…In the same year, Griffith et al [23] analyzed the characteristics of a single-elastic-constrained flapping hydrofoil with different operating parameters by simulating a range of geometries, from the circular cylinder with an aspect ratio of 1.0 to elliptical cylinders up to an aspect ratio of 6.0. In addition to the studies on kinematic parameters, the research on fully constrained and semi-active foil systems tends to consider the influence of the realistic environment, where the flapping foils are deployed [24].…”

Investigation of Submergence Depth and Wave-Induced Effects on the Performance of a Fully Passive Energy Harvesting Flapping Foil Operating Beneath the Free Surface

“…The effects of proximity to the free surface, for instance, or the effects of waves, have not yet been explored. The effects of the free surface on active flapping foils were studied by [16,17], whose results were similar, finding that the effect of the free surface on the performance of the devices was mostly negative, but becomes quickly irrelevant as submergence depth increases.…”

Effect of the shape of flapping airfoils on aerodynamic forces

“…Flapping can be applied in various flow regimes to gain advantage in the overall efficiency of the wings and rotors of flying machines and turbine blades. The motion of birds and fish has been investigated in detail by previous researchers to make locomotion more efficient [ [1] , [2] , [3] , [4] , [5] , [6] , [7] , [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] ]. Various researchers have studied the effects of airfoil shape on the aerodynamic performance of airfoils [ [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] ].…”