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A high-order spectral method for nonlinear wave–body interactions

Published online by Cambridge University Press:  26 April 2006

Yuming Liu ,
Douglas G. Dommermuth  and
Dick K. P. Yue
Yuming Liu
Affiliation:
Department of Ocean Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Douglas G. Dommermuth
Affiliation:
Department of Ocean Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA Present address: SAIC, 10260 Campus Point Drive, San Diego, California, USA.
Dick K. P. Yue
Affiliation:
Department of Ocean Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Abstract

A high-order spectral method originally developed to simulate nonlinear gravity wave–wave interactions (Dommermuth & Yue 1987a), is here extended to study nonlinear interactions between surface waves and a body. The present method accounts for the nonlinear interactions among NF wave modes on the free surface and NB source modes on the body surface up to an arbitrary order M in wave steepness. By using fast-transform techniques, the operational count per time step is only linearly proportional to M and NF (typically NF [Gt ] NB). Significantly, for a (closed) submerged body, the exponential convergence with respect to M, NF (for moderately steep waves), and NB is obtained. To illustrate the usefulness of this method, we apply it to study the diffraction of Stokes waves by a submerged circular cylinder. Computations up to M = 4 are performed to obtain the nonlinear steady and harmonic forces on the cylinder and the transmission and reflection coefficients. Comparisons to available measurements as well as existing theoretical/computational predictions are in good agreement. Our most important result is the quantification of the negative horizontal drift force on the cylinder which is fourth order in the incident wave steepness. It is found that the dominant contribution of this force is due to the quadratic interaction of the first- and third-order first-harmonic waves rather than the self-interaction of the second-order second-harmonic waves, which in fact reduces the negative drift force.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 245 , December 1992 , pp. 115 - 136
Copyright
© 1992 Cambridge University Press

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