Spectral element modelling of floating bodies in a Boussinesq framework

Allan Peter Engsig-Karup, Claes Eskilsson, Mario Ricchiuto

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The wave energy sector relies heavily on the use of linear hydrodynamic models for the assessment of motions, loads and power production. The linear codes are computationally efficient and produce good results if applied within their application window. However, recent studies using two-phase VOF-RANS simulations of point-absorbers close to resonance have indicated that there might be significant differences between the power production using linear hydrodynamics and VOF-RANS. At present VOF-RANS simulations are too computational expensive to be used in the design cycle. In shallow and intermediate waters a possible middle way between the highly simplified and fast linear hydrodynamics and the very complete but slow VOF-RANS simulations is to use nonlinear, dispersive wave equations of Boussinesq-type. Jiang (2001) presented a unified approach for including bodies into the Boussinesq framework and solved the system with finite differences. In the unified approach the pressure working on the body are solved for using the instantaneous draft. In this study we will outline how to implement the approach of Jiang in a spectral/hp element setting, and simulate the heave motion of a body using different asymptotic wave equations. We will especially focus on the stabilization of the coupled system.
Original languageEnglish
Publication date2015
Number of pages1
Publication statusPublished - 2015
Event2nd Frontiers in Computational Physics Conference: Energy Sciences - Zurich, Switzerland
Duration: 3 Jun 20155 Jun 2015
Conference number: 2


Conference2nd Frontiers in Computational Physics Conference: Energy Sciences
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Bibliographical note

Invited talk presented at 2nd Frontiers in Computational Physics conference 2015.


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