User's Guide for SHIPINT - A Computer Program to Compute Two Ship Interaction in Waves

Abstract : The computer program SHIPINT was developed for the coupled motion computations of two adjacent ships advancing on a parallel course in regular or irregular waves. The code is written in Fortran 77 ANSI. The coupled motion computations use the three-dimensional panel method, and the zero-speed Green function with a simple forward speed correction. With this method, the field points and source points are all distributed on the wetted surfaces of two ships (ship-a and ship-b). The hydrodynamic forces, wave exciting forces and motions are computed based on two ship interaction. The double body flow model is applied to obtain the steady flow disturbance potential and velocity distributions on the wetted surface on ship-a and ship-b by the Hess-Smith method. The m-terms are computed by the integral equation method based on double body flow of two ship interaction. The approximate m-terms can also be used in this program. Schmitke's method is used to compute the viscous roll damping coefficients for ship-a on its own, and ship-b on its own; therefore, the viscous interaction effect is not considered. The spectral analyses are carried out for ship-a and ship-b. Input and output files, and examples are also presented and described in detail in this guide.