On the oblique water-entry problem of a rigid sphere. (English) Zbl 0735.73060

Summary: The case of oblique water-entry of a rigid sphere into an ideal incompressible fluid is studied analytically in order to determine the hydrodynamical loads acting on the body. We consider the motion imparted to the fluid by an impulsively-started partially-submerged sphere under the large-impact approximation, in which the free surface is assumed flat and equipotential. Asymptotic small-time expressions are derived for both the vertical and horizontal time-dependent added masses and analytical expressions for the hydrodynamic forces are obtained by differentiating these added masses with respect to the instantaneous submergence depth. The resulting expressions are also compared with corresponding numerical solutions and with a known solution for a two-dimensional profile.


74F10 Fluid-solid interactions (including aero- and hydro-elasticity, porosity, etc.)
76B99 Incompressible inviscid fluids
45B05 Fredholm integral equations
45M05 Asymptotics of solutions to integral equations


Zbl 0677.76013
Full Text: DOI


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