Accession Number : ADA134055

Title :   Improved Prediction of Drift Forces and Moment.

Descriptive Note : Final rept.,

Corporate Author : DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD

Personal Author(s) : Hong,Young S

PDF Url : ADA134055

Report Date : Sep 1983

Pagination or Media Count : 43

Abstract : A three-dimensional method is developed to improve the computation of the drift force and moment for small-waterplane-area, twin-hull (SWATH) and surface ships in oblique waves with zero forward speed. Numerical results have been computed for three ships: SWATH 6A, Stretched SSP, and MCM experiment. For MCM 5371, the results of two- and three- dimensional methods are almost identical to each other and these results show good agreement with experiment when the wavelength ratio is not too small. Even though there are no test data available for SWATH 6A, the application of three dimensional theory is likely to improve the results of drift force and moment for SWATH ships. (Author)

Descriptors :   *Drift, *Mathematical prediction, *Ship motion, Mathematical models, Heaving, Roll, Three dimensional, Moments, Ocean surface, Mine countermeasures

Subject Categories : Marine Engineering
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE