Giorgi, Giuseppe and Penalba, Markel and Ringwood, John
(2016)
Nonlinear Hydrodynamic Force Relevance for
Heaving Point Absorbers and Oscillating Surge
Converters.
In: Asian Wave and Tidal Energy Conference (AWTEC 2016), 24-28 October 2016, Singapore.
Abstract
Two of the most common modes of oscillation of
single degree of freedom wave energy converters are heave
and surge, which are respectively exploited by heaving point
absorbers (HPAs) and oscillating surge converters (OSCs).
Notwithstanding essential hydrodynamic differences, both devices
are very often described by the same linear model structure.
However, if the linearising assumption of small amplitudes of
motion is challenged, especially under controlled conditions,
different (and significant) nonlinearities are excited in the devices.
This paper studies the differences between the hydrodynamic
forces in HPAs and OSCs under controlled conditions, considering
a nonlinear representation of Froude-Krylov forces and
viscous drag effects. Results show that HPAs are predominantly
affected by nonlinear Froude-Krylov forces, while the most
important hydrodynamic forces in OSCs are due to diffraction
and radiation effects. In addition, viscous drag appears to have
little relevance in HPAs but a significant influence in OSCs.
| Item Type: |
Conference or Workshop Item
(Paper)
|
| Additional Information: |
This paper is based upon work supported by Science Foundation
Ireland under Grant No. 13/IA/1886. |
| Keywords: |
Wave energy; nonlinear Froude-Krylov force;
viscous drag; heaving point absorbers; oscillating surge converters; |
| Academic Unit: |
Faculty of Science and Engineering > Electronic Engineering |
| Item ID: |
9428 |
| Depositing User: |
Professor John Ringwood
|
| Date Deposited: |
30 Apr 2018 13:44 |
| Refereed: |
Yes |
| Funders: |
Science Foundation Ireland (SFI) |
| URI: |
|
| Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
Repository Staff Only(login required)
 |
Item control page |
Downloads per month over past year
Origin of downloads
Altmetric
Altmetric