Accession Number : AD0644183

Title :   THE SECOND-ORDER THEORY OF CYLINDERS OSCILLATING VERTICALLY IN A FREE SURFACE.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY COLL OF ENGINEERING

Personal Author(s) : Lee,Choung Mook

Report Date : SEP 1966

Pagination or Media Count : 155

Abstract : Let a cylinder be half submerged with its generators parallel to the water surface, and suppose it to be symmetric about a vertical axis. Further suppose the cylinder to be oscillating harmonically in a vertical direction. The pressure distribution about the cylinder, the force acting upon it, and the waves generated by it are computed through the second order of a perturbation series in the ratio of amplitude of motion to beam. The resulting potential-theory problems are solved by placing singularities of all orders at the intersection of the water surface with the vertical axis of symmetry and determining their strengths from the boundary condition on the body. Numerical computations are made for a circular cylinder and for a U-shaped cylinder. The results are presented in graphs. (Author)

Descriptors :   (*SHIPS, OSCILLATION), (*CYLINDRICAL BODIES, OSCILLATION), THEORY, FORCE(MECHANICS), PERTURBATION THEORY, POTENTIAL THEORY, NUMERICAL ANALYSIS, WATER WAVES, FLUID DYNAMICS

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE