Study on hydrodynamic characteristics of flapping hydrofoil under surface motion control based on immersed boundary-lattice Boltzmann method
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The hydrodynamic characteristics of a flapping hydrofoil under surface motion control were investigated using the implicit direct forcing immersed boundary-lattice Boltzmann method (IB-LBM). The leading and trailing edges are subjected to surface motion with different lengths and velocities. Results within the range of investigated parameters indicated that controlling the motion of the leading-edge surface can suppress the separation of the leading edge vortex on the flapping hydrofoil surface. The energy harvesting efficiency reaches 53.97% when the dimensionless length of the leading edge surface motion L l =0.8 and the dimensionless velocity S v =0.4. Controlling the motion of the trailing edge surface delays the shedding of the trailing edge vortex and effectively modulates the pressure distribution on the flapping foil surface. With a dimensionless trailing-edge surface motion length L t =0.1 and velocity S v =0.4, the energy harvesting efficiency attains 55.66%.
