A Fully Nonlinear, Dynamically Consistent Numerical Model for Solid-Body Ship Motion. 1. Ship Motion with Fixed Heading

In this paper, we describe the details of our numerical model for simulating ship solid-body motion in a given environment. In this model, the fully nonlinear dynamical equations governing the time-varying solid-body ship motion under the forces arising from ship-wave interactions are solved with gi...

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Bibliographic Details
Main Authors: Lin, Ray-Qing, Kuang, Weijia
Format: Report
Language:English
Subjects:
FINITE ELEMENT ANALYSIS
HYDRODYNAMICS
INTERACTIONS
Marine Engineering
MATHEMATICAL MODELS
NONLINEAR SYSTEMS
NUMERICAL METHODS AND PROCEDURES
SHIP MOTION
SOLID BODIES
Theoretical Mathematics
UNDERWATER
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Summary:In this paper, we describe the details of our numerical model for simulating ship solid-body motion in a given environment. In this model, the fully nonlinear dynamical equations governing the time-varying solid-body ship motion under the forces arising from ship-wave interactions are solved with given initial conditions. The net force and moment (torque) on the ship body are directly calculated via integration of the hydrodynamic pressure over the wetted surface and the buoyancy effect from the underwater volume of the actual ship hull with a hybrid finite-difference/finite-element method. Neither empirical nor free parametrization is introduced in this model, i.e. no a priori experimental data are needed for modelling. This model is benchmarked with many experiments of various ship hulls for heave, roll and pitch motion. In addition to the benchmark cases, numerical experiments are also carried out for strongly nonlinear ship motion with a fixed heading. These new cases demonstrate clearly the importance of nonlinearities in ship motion modelling. Published in the Proceedings of the Royal Society A, 2010. Prepared in cooperation with NASA Goddard Space Flight Center, Greenbelt, MD.