A numerical wave tank is applied to the study of chaotic roll motions of a two-dimensional floating body. This numerical wave tank is constructed by a time-domain, fully nonlinear simulation method based on potential theory. In this simulation method, boundary value problems both on the velocity potential phi and its time derivative partial phi/partial t are solved. The coupling condition between wave and floating body is imposed as the implicit boundary condition of partial phi/partial t on a wet body surface. The radiation condition at the tank ends is satisfied by artificial damping technique. Using this numerical wave tank, the chaotic motions of a 2-D unstable floating body with a small negative GM are simulated in time domain taking fully nonlinear fluid-body interaction into account. The simulated time history, phase plot and Poincare section of roll motions are presented and the dependency of the motion to wave height is discussed.
Application of fully nonlinear numerical wave tank to the study of chaotic roll motions
International Journal of Offshore and Polar Engineering ; 9 , 2 ; 90-96
1999
7 Seiten, 15 Quellen
Aufsatz (Zeitschrift)
Englisch
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