Propulsion Performance and Wake Dynamics of Heaving Foils under Different Waveform Input Perturbations

A numerical simulation is used to investigate the effects of adding high frequency and low amplitude perturbations different waveforms sinusoidal-based signal heaving foil on propulsion performance wake structure. We use adjustable parameter k achieve a motion various waveform cycle trajectories, such as sawtooth, sine, square. Adding perturbation whatever beneficial in increasing thrust foil, especially by square wave with 10 Hz, pushes up 10.49 times that without perturbation. However, addition brings reduction efficiency, larger frequency, lower efficiency. The structure behaves similarly under perturbations, all going through some intermediate stages, which eventually evolve into chaotic increase frequency. can destabilize This work further explains effect signals base sinusoidal provides new control idea for underwater vehicles.