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| Abstract |
Unsteady hydrodynamic forces acting on an oscillating wing below free-surface is studied in two dimensional problem. Unsteady velocity potential is expressed by the distribution of singularities over ...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 wing surface. Numerical calculations for a wing with several Froude numbers and submergences are demonstrated and the results 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. This could be explained by the fact that one of four surface wave systems is possible to propagate forward for \tau ≦0.25. Experimental results carried out for two wings in heaving oscillation show good agreement with the present calculations.show more
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