Abstract
Hydrodynamic forces acting on bodies with rectangular and circular sections were measured. Nonlinear forces were found to exist. Radiation forces on bodies forced to sway in simple and in combined two-harmonic oscillations at low and high frequencies were measured. Hydrodynamic coefficients obtained from the simple harmonies differed from the two-harmonic oscillations. Wave diffraction forces on bodies oscillating at low frequencies were also measured and found to be different from those acting on still bodies. These differences are considered as nonlinear hydrodynamic forces and have good correlation with the increases in the modified Keulegan- Carpenter number proposed in this paper for the case of combined oscillations.
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