Occurrence of relative heave motion of floating bodies

Abstract

The cause of relative heave motion of floating bodies in waves is investigated. In the analysis, different wave pressure approximations near the wave surface are used. The pressure fields considered include the linear wave approximation, effective wave slope approach and hydrostatic pressure with reference to the moving free surface. Also considered is a pressure distribution which satisfies the linearized boundary condition at the free surface (i. e. at z = η, where η is the instantaneous wave surface elevation). The latter yields reasonable heave responses and is convenient to use in non-linear dynamic analysis.