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Area of Science:

  • Fluid Dynamics
  • Hydrodynamics
  • Robotics

Background:

  • Thrust-generating foils are used in bio-inspired propulsion.
  • Understanding hydrodynamic forces near boundaries is critical for vehicle performance.

Purpose of the Study:

  • Investigate the impact of proximity to a solid boundary on oscillating foil performance.
  • Quantify the 'ground effect' on hydrodynamic forces and torques.
  • Determine the three-dimensional nature of this ground effect.

Main Methods:

  • Experimental towing tank study of a rolling and pitching foil.
  • Varied foil kinematics and distances from a solid boundary.
  • Measured hydrodynamic forces and torques.

Main Results:

  • Significant changes in mean lift and thrust observed near the boundary.
  • Ground effect magnitude shows strong nonlinear dependence on boundary distance.
  • Lift coefficients varied significantly, with effects seen within three chord lengths.
  • Ground effect is a three-dimensional phenomenon, not predicted by 2D models.

Conclusions:

  • Ground effect provides passive obstacle avoidance for foil-propelled vehicles.
  • Three-dimensional foil kinematics are essential for accurate modeling and practical applications.
  • Experimental data highlights the importance of boundary interactions in foil propulsion.