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《Chinese Journal of Computational Mechanics》 2010-01
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Time-domain simulation of the wave-current action on 3D bodies

LIU Zhen1,TENG Bin1,NING De-zhi1,SUN Liang1(1.State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116023,China)  
A time-domain numerical model is established by a higher-order boundary element method to study the problem of wave-current action on arbitrary 3D bodies.Under the assumption of small flow velocity,the velocity potential is expanded by a perturbation method.The boundary value problem is decomposed into a steady double-body flow problem at the zero-order of wave steepness and an unsteady wave problem at the first-order of wave steepness.The velocity potential on the body surface and the derivative of the velocity potential on the free surface are then given as the solution of a higher order boundary element integral equation,which is solved by a numerical code.A 4th-order Runge-Kutta method is applied for the time marching.An artificial damping layer is adopted to dissipate the scattering waves.Validation of the numerical method is carried out on wave forces,run-up and mean drift forces of wave-current acting on a bottom-mounted vertical cylinder.The present results are all in close agreement with the results of a frequency-domain method and a published time-domain method.Subsequently,this model was applied to investigate the problem of wave-current interaction with actual engineering structures.
【Fund】: 国家自然科学基金(50709005 50921001 10772040);; 国家科技重大专项课题(2008ZX05026-02)资助项目
【CateGory Index】: TV139.2
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