
Accession Number : AD0701368
Title : IRROTATIONAL FLOW ABOUT SHIP FORMS,
Descriptive Note : Interim rept.,
Corporate Author : IOWA UNIV IOWA CITY IOWA INST OF HYDRAULIC RESEARCH
Personal Author(s) : Landweber,Louis ; Macagno ,Matilde
Report Date : DEC 1969
Pagination or Media Count : 35
Abstract : A method of computing the potential flow about a ship model in terms of a source distribution on the hull surface is described. After a formulation and discussion of the flow with wavemaking, the zeroFroude number, doubleshipmodel case is treated in detail. The Fredholm singular integral equation of the second kind for the source distribution is solved numerically by removing the singularity, replacing the integral by a quadrature formula, and solving the resulting highorder set of linear equations by an iteration formula for which convergence is proved. The corresponding velocity potential on the hull surface, the evaluation of which from the source distribution also requires the calculation of a singular integral, is obtained by first solving the equipotential problem for the hull form (which employs the same kernel as the original integral equation). The solution of this Dirichlet problem is then used to remove the singularity from the velocitypotential integral, and then the latter is computed by means of a quadrature formula. The method is applied to an ellipsoid, results from which are compared with the exact solution. A FORTRAN program is included. (Author)
Descriptors : (*SHIP HULLS, *HYDRODYNAMICS), INCOMPRESSIBLE FLOW, SHIP MODELS, POTENTIAL THEORY, SHIPS, INTEGRAL EQUATIONS, THREE DIMENSIONAL FLOW, DISTRIBUTION, SOURCES
Subject Categories : Marine Engineering
Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE