Theoretical Manual for Sealoads: a Three-Dimensional Nonlinear Time-Domain Sea Loads Computer Code

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Authors
  1. Cong, L.
  2. Qiu, W.
  3. 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 describes the theoretical formulation for SEALOADS, a computer program for the time-domain prediction of ship motions, sea loads, and hydrodynamic pressures on a ship hull. The three-dimensional time-domain Green function is used to derive the forces due to radiated and diffracted waves. The Froude-Krylov forces are computed at the instantaneous position using the three-dimensional panel method. Nonlinear viscous damping, resistance, and cross-flow drag are included. The propeller thrust, rudder and maneuvering forces are also taken into account. After the nonlinear equations of ship motions are solved in the time domain, hydrodynamic pressures on the ship hull and bending moments and shear forces acting on a cross section of the ship are computed.
Keywords
Time domain;Panel methods;Sea loads;Bow-flare impacts;Head waves;Irregular waves;Nonlinear theory;Wave loads;Free surface;Froude-Krylov;Frequency domain;Hull pressure;Hydrodynamic pressures;3-dimensional panel method
Report Number
DREA-CR-98-443 — Contractor Report
Date of publication
01 Oct 1999
Number of Pages
82
DSTKIM No
CA000913
CANDIS No
512741
Format(s):
Hardcopy;Document Image stored on Optical Disk

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