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Wave induced motions of point-absorbers: a hierarchical investigation of hydrodynamic models

Claes Eskilsson (Institutionen för sjöfart och marin teknik, Marin teknik) ; Johannes Palm (Institutionen för sjöfart och marin teknik, Marin teknik) ; Allan Peter Engsig-Karup ; Umberto Bosi ; Mario Ricchiuto
Proceedings of the 11th European Wave and Tidal Energy Conference (2309-1983). (2015)
[Konferensbidrag, refereegranskat]

We present an initial study of using nonlinear and dispersive Boussinesq-type equations for simulating the response of a point absorber in waves. Boussinesq-type models are ex- pressed in horizontal dimensions only, resulting in computation- ally efficient models with a real possibility to simulate entire sea states in a fully nonlinear sense. The wave-body coupling is achieved using the unified Boussinesq approach of Jiang [15] and the model formulated in one spatial dimension is discretized using a spectral/hp element method. As a first step in our modelling and analysis, we apply the model to a test case of a heaving box subjected to finite-amplitude waves of increasing steepness. The simulations are compared to results obtained by (i) a conventional linear model and (ii) a two-phase volume-of-fluid Reynolds Averaged Navier-Stokes (VOF-RANS) model. We find that there is a significant difference in heave response between the linear and VOF-RANS simulations, were the VOF-RANS give much smaller amplitude response. The Boussinesq model gave smaller response than the linear model but still clearly larger than obtained by VOF-RANS. We believe this shortcoming in the modelling is due to the Boussinesq expansion used below the hull, which needs to be enhanced.

Nyckelord: Wave energy converter, nonlinear waves, Boussinesq-type equations, Navier-Stokes equations, spectral element method

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Denna post skapades 2015-10-02.
CPL Pubid: 223578


Institutioner (Chalmers)

Institutionen för sjöfart och marin teknik, Marin teknik (2015-2017)


Hållbar utveckling
Marin teknik

Chalmers infrastruktur