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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

Conference

Conference6th Conference on Computational Methods in Marine Engineering (Marine 2015)
CountryItaly
CityRome
Period15/06/1517/06/15

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.

    Research areas

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

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