Numerical investigation of nonlinear wave interaction with a submerged object
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Abstract
Submerged objects are widely occurred in ocean and coastal engineering. Their
presence influences the neighbouring flow field and even generates higher harmonic waves. A
two-dimensional fully nonlinear numerical wave flume, based on a time-domain higher-order boundary
element method is developed to investigate nonlinear interactions between regular waves and a
submerged object. The incident wave is generated by the inner-source wavemaker.
Fully nonlinear kinematics and dynamics boundary conditions are satisfied on the transient
free surface. A mixed Eulerian-Lagrangian technique combined with the fourth- order Runge-Kutta
scheme is used as the time marching process. A four-point method is used to separate bound and
free harmonic waves. The proposed model is verified against the experimental and other
numerical data for nonlinear waves scattering by a submerged trapezoid and a submerged
horizontal cylinder, respectively. Numerical tests are performed to investigate the effects of
submergence and characterised length of a submerged object, static
water depth on the high free harmonics.