Abstract
The aim of this study is to validate and assess the capability of an advanced hydrodynamic time-domain model through the comparison of numerical and experimental results of a small-scale bottom-fixed pitch buoy wave energy converter. The series of tests have been conducted in the hydraulic laboratory of Aalborg University. The device is a prototype of a singleWavestar float, scaled at 1:20, considering one degree of freedom only. The tests included a various range of incoming waves, from small regular waves to storm conditions irregular waves.
The numerical simulations have been performed at the WavEC using an in-house time-domain model. The code, based on the linear potential theory, solves the system of motion equations using state-space representations of the radiation terms and includes nonlinear hydrostatic forces and nonlinear Froude-Krylov excitation terms, which require the instantaneous detection of the floating body wetted surface. The idea behind this approach is first to increase the model accuracy (compared to the fully linear model method), but also to keep the computational time relatively low.
Results show a good agreement between experimental and numerical data, which enhance significantly the confidence in using such sort of models to simulate the behavior of wave energy converters.
The numerical simulations have been performed at the WavEC using an in-house time-domain model. The code, based on the linear potential theory, solves the system of motion equations using state-space representations of the radiation terms and includes nonlinear hydrostatic forces and nonlinear Froude-Krylov excitation terms, which require the instantaneous detection of the floating body wetted surface. The idea behind this approach is first to increase the model accuracy (compared to the fully linear model method), but also to keep the computational time relatively low.
Results show a good agreement between experimental and numerical data, which enhance significantly the confidence in using such sort of models to simulate the behavior of wave energy converters.
| Original language | English |
|---|---|
| Title of host publication | 10th ewtec 2013 European Wave and Tidal Energy Conference Series : Proceedings of the 10th European Wave and Tidal Energy Conference |
| Editors | Peter Frigaard, Jens Peter Kofoed, AbuBakr S. Bahaj, Lars Bergdahl, Alain Clément, Daniel Conley, Antonio F. O. Falcão, Cameron MacLeod Johnstone, Lucia Margheritini, Ian Masters, António José Sarmento, Diego Vicinanza |
| Number of pages | 7 |
| Place of Publication | Aalborg |
| Publisher | Technical Committee of the European Wave and Tidal Energy Conference |
| Publication date | 2013 |
| Publication status | Published - 2013 |
| Event | European Wave and Tidal Energy Conference - Aalborg, Denmark Duration: 2 Sept 2013 → 5 Sept 2013 Conference number: 10 |
Conference
| Conference | European Wave and Tidal Energy Conference |
|---|---|
| Number | 10 |
| Country/Territory | Denmark |
| City | Aalborg |
| Period | 02/09/2013 → 05/09/2013 |
| Series | European Wave and Tidal Energy Conference Series |
|---|---|
| Number | 10 |
Bibliographical note
The proceedings is published on a usb.Keywords
- Numerical modelling
- Froude-Krylov forces
- Stokes’ 2nd order theory
- Lab experiment
- State-space
- Nonlinear hydrostatics