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Numerical investigation of nonlinear wave interaction with a submerged object

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Original languageEnglish
Number of pages12
Publication statusPublished - 15 Jun 2015
Event6th Conference on Computational Methods in Marine Engineering (Marine 2015) - Rome, Italy
Duration: 15 Jun 201517 Jun 2015


Conference6th Conference on Computational Methods in Marine Engineering (Marine 2015)


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.

    Research areas

  • Submerged object, nonlinear numerical wave flume, higher-order boundary element method, higher harmonics


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