On nonlinear wave-structure interaction using an immersed boundary method in 2D

Research output: Research - peer-reviewConference abstract in proceedings – Annual report year: 2016

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Introduction
We present our progress on the development and preliminary benchmarking results of a new efficient methodology for solving fully non-linear potential flow wave-structure interaction problems. The new model utilises the efficiency of finite difference methods on structured grids. The structure geometry is introduced using an Immersed Boundary Method (IBM) and the body boundary condition (BC) is satisfied with a Weighted Least Squares (WLS) approximation [7]. This allows complex geometries to be represented with high accuracy. The stability of the scheme is ensured by adopting the Weighted Essentially Non-Oscillatory (WENO) scheme [8] together with a Lax-Friedrichs type flux applied to the free surface conditions in Hamilton-Jacobi form. This work can be viewed as a novel extension of the flexible order finite difference potential flow solver OceanWave3D [2] to include the presence of a structure. The method obtains an optimum scaling of the solution effort [2] and has been implemented on massively parallel GPU architectures using the CUDA API [3] making it suitable for high resolution flow simulations. This combination of novel and robust numerical methods aims at creating new efficient tools for non-linear wave-structure interaction problems. The scheme is validated using the forced heaving motion of a two-dimensional (2D) horizontal circular cylinder with promising results, although there are still challenges to be overcome in terms of properly capturing the behavior of the intersection between the body and the free-surface.
Original languageEnglish
Title of host publicationProceedings of the 31th International Workshop on Water Waves and Floating Bodies (IWWWFB 2016)
Number of pages4
Publication date2016
StatePublished - 2016
Event31th International Workshop on Water Waves and Floating Bodies (IWWWFB 2016) - Plymouth, United States
Duration: 3 Apr 20166 Apr 2016
Conference number: 31
http://www.iwwwfb.org/default.htm

Workshop

Workshop31th International Workshop on Water Waves and Floating Bodies (IWWWFB 2016)
Number31
CountryUnited States
CityPlymouth
Period03/04/201606/04/2016
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