Added mass and damping on an oscillating surface-piercing column with a horizontal cylinder: square cross sections
Academic Article
Overview
Additional Document Info
View All
Overview
abstract
Added mass and damping on a long horizontal cylinder of a square cross section (Model A) and a vertical surface-piercing square cylinder or column with a long horizontal cylinder of a square cross section (Model B) oscillating in water of finite and infinite depths, are measured using a planar motion mechanism. The horizontal cylinder comprises a test section of 91.44 cm in length at the center and two 91.44-cm dummy sections on each end of the test section. The model was forced to sway and heave sinusoidally with small amplitudes for several submergences below the free surface. The added mass and wave-damping coefficients are shown to be influenced strongly by the free-surface effect and are presented as a function of water depth, frequency and direction of oscillation and of depth of submergence near the free surface. There clearly exists a critical nondimensional frequency near +2$/a/g=0.3 for the heave oscillations near the free surface.
