THE UNSTEADY LIFT ON A TWO-DIMENSIONAL WING OSCILLATING BELOW A FREE-SURFACE

The two-dimensional problem of unsteady lift acting on an oscillating wing below a free-surface is studied. Unsteady velocity potential is expressed by the distribution of singularities over the wing and the wake. A set of integral equations in terms of the forward speed Green function is solved numerically for a thick wing of arbitrary section. Hydrodynamic forces are obtained by integrating the pressure on the wing surface. Numerical calculations for a wing with several Froude numbers and the submergences are demonstrated and results such as the pressure distribution and the hydrodynamic force coefficients are presented graphically. It is found that unsteady lift on an oscillating wing at shallow submergence shows abrupt change near the characteristic number, tau takes 0.25, which is determined by the forward speed and the oscillating frequency. Experimental results carried out for two wings in heaving oscillation show good agreement with the calculations.

  • Supplemental Notes:
    • Soc Naval Arch Japan J, v 170, Dec 1991, p 319 [11 p, 10 ref, 15 fig]
  • Authors:
    • Kyozuka, Y
  • Publication Date: 1991

Language

  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00716264
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Feb 28 1996 12:00AM