(4) A framework for efficient irregular wave simulations using Higher Order Spectral method coupled with viscous two phase model

Inno Gatin ^{a , ∗,} Vuko Vuk cevic ^a , Hrvoje Jasak ^{a , b}
a Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lucica 5, Zagreb, Croatia

b Wikki Ltd., 459 Southbank House, SE1 7SJ London, United Kingdom

Received 10 May 2017; received in revised form 24 July 2017; accepted 6 September 2017
Available online 14 September 2017

Abstract
In this paper a framework for efficient irregular wave simulations using Higher Order Spectral method coupled with fully nonlinear viscous, two-phase Computational Fluid Dynamics (CFD) model is presented. CFD model is based on solution decomposition via Spectral Wave Explicit Navier–Stokes Equation method, allowing efficient coupling with arbitrary potential flow solutions. Higher Order Spectrum is a pseudo-spectral, potential flow method for solving nonlinear free surface boundary conditions up to an arbitrary order of nonlinearity. It is capable of efficient long time nonlinear propagation of arbitrary input wave spectra, which can be used to obtain realistic extreme waves. To facilitate the coupling strategy, Higher Order Spectrum method is implemented in foam-extend alongside the CFD model. Validation of the Higher Order Spectrum  ethod is performed on three test cases including monochromatic and irregular wave fields. Additionally, the coupling between Higher Order Spectrum and CFD is validated on three hour irregular wave propagation. Finally, a simulation of a 3D extreme wave encountering a full scale container ship is shown.
© 2017ShanghaiJiaotongUniversity.PublishedbyElsevierB.V.
This is an open access article under the CC BY-NC-ND license. ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )

Keywords: Higher Order Spectral method; Irregular waves; Extreme waves; CFD; Foam-extend.