Theoretical manual for sealoads. Version 1: A program for prediction of nonlinear ship motions, sea loads, and pressure distribution in the time domain

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Authors
  1. Qiu, W.
  2. Hsiung, C.C.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Dalhousie Univ, Halifax NS (CAN) Centre for Marine Vessel Development and Research
Abstract
This report presents the theoretical background for the computer code SEALOADS version 1.0, which computes nonlinear ship motions, sea loads and hydrodynamic pressure distributions over the wetted hull surface in the time domain. The external forces acting on the ship hull include the linearized radiation and diffraction forces, nonlinear Froude-Krylov force, viscous roll damping force, bow-flare slamming force and other forces from rudder, maneuvering, etc. The linearized radiation and diffraction forces are obtained from the impusle response functions, which are solved by using the time-domain Green function and applying a non-impulsive input to the ship. The nonlinear Froude-Krylov force is computed at the instantaneous wetted surface of the hull. A two-dimensional wedge model is applied to compute the bow-flare slamming force. The nonlinear equations of ship motion are solved in the time domain by the fourth-order Runge-Kutta technique.
Keywords
Sea loads;Wave loads;Hydrodynamic pressures;3-dimensional panel method;Time domain;Nonlinear forces;Computer program manuals;Hydrodynamic pressure
Report Number
DREA-CR-2000-128;NAP-1999-005 — Contractor Report
Date of publication
01 Aug 2000
Number of Pages
75
DSTKIM No
CA011020
CANDIS No
515657
Format(s):
Hardcopy;Document Image stored on Optical Disk

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