Fig 1.
The wave glider platform developed by National Ocean Technology Center.
Fig 2.
The operating principles of the wave glider.
Table 1.
Highlights of earlier studies on wave glider.
Fig 3.
The sinusoidal pitching profile of a traditional oscillating hydrofoil.
Fig 4.
The motion model of the wave glider, (a) Passive oscillating foil (b) Schematic of angles and forces on an oscillating foil (c) non-sinusoidal pitching profile.
Fig 5.
Time variation of θ(t) for different values of β in one period.
Fig 6.
Mesh details of the oscillating foil.
Fig 7.
Evolution of CX, CY and CM for the different levels of cells and time steps at θ0 = 57° and f* = 0.34.
Table 2.
The numerical results for the different levels of cells and time steps (θ0 = 57, f* = 0.34).
Fig 8.
Comparison of CX, CY and CM from the literature [30] and this study.
Table 3.
Fig 9.
Variations of the mean output power coefficient with reduced frequency for different pitching amplitudes.
Fig 10.
Variations of the mean output power coefficient with pitching amplitude for different reduced frequencies.
Fig 11.
Variations of the mean output power coefficient with β (θ0 = 40°, f* = 0.306,0.34,0.374).
Fig 12.
Variations of the propulsion efficiency with β (θ0 = 40°, f* = 0.306,0.34,0.374).
Fig 13.
Time variations of the thrust coefficient for different values of β (θ0 = 40°, f* = 0.34).
Fig 14.
Time variations of the effective angle of attack and heaving induced angle for different values of β (θ0 = 40°, f* = 0.34).
Fig 15.
Vorticity contours for t = 0T-0.2T for different values of β (θ0 = 40°, f* = 0.34), represented by contour levels of spanwise vorticity ranging from -12(darker grey) to 12(lighter grey).
Fig 16.
Variations of the mean output power coefficient with β(θ0 = 60°, f* = 0.306,0.34,0.374).
Fig 17.
Variations of the propulsion efficiency with β(θ0 = 60°, f* = 0.306,0.34,0.374).
Fig 18.
Time variations of the thrust coefficient for different values of β (θ0 = 60°, f* = 0.34).
Fig 19.
Time variations of the effective angle of attack and the heaving induced angle for different values of β (θ0 = 60°, f* = 0.34).
Fig 20.
Vorticity contours during t = 0T-0.2T for different values of β (θ0 = 60°, f* = 0.34), represented by contour levels of spanwise vorticity ranging from -12(darker grey) to 12(lighter grey).
Fig 21.
Mean output power coefficient versus β (θ0 = 20−70°, f* = 0.34).
Fig 22.
Histogram of the mean output power coefficient increments between β = 1 and β = 4 (θ0 = 20−70°, f* = 0.34).