posted on 2018-07-20, 08:33authored byEmiliano Renzi, Yanji Wei, F. Dias
Recent wave tank experiments on a flap-type wave energy converter showed
the occurrence of extreme wave loads, corresponding to slamming events
in highly energetic seas. In this paper, we analyse pressure-impulse values
from available pressure measurements, for a series of experimental slamming
tests. Then, we devise a pressure-impulse model of the slamming of a flapping
plate, including the effects caused by air entrapment near the plate.
Using a double conformal-mapping technique, we map the original domain
into a semi-infinite channel, by means of Gauss’ hypergeometric functions.
This allows us to express the pressure impulse as a superimposition of orthogonal
eigenfunctions in the transformed space. The mathematical model
is validated against the experimental data. Parametric analysis shows that
the system is much more sensitive to the impact angle than to the initial
wetted portion of the flap. Furthermore, the presence of an aerated region
determines the pressure-impulse values to increase significantly at all points
on the flap surface.
Funding
This study was partially supported by Science Foundation Ireland (SFI) under the research project ”High-end Computational
Modelling for Wave Energy Systems” (Grant SFI/10/IN.1/12996) in collaboration with Marine Renewable Energy Ireland (MaREI), the SFI Centre for Marine Renewable Energy Research (SFI/12/RC/2302).
History
School
Science
Department
Mathematical Sciences
Published in
Journal of Fluids and Structures
Citation
RENZI, E., WEI, Y. and DIAS, F., 2018. The pressure impulse of wave slamming on an oscillating wave energy converter. Journal of Fluids and Structures, 82, pp.258-271.
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/
Acceptance date
2018-07-06
Publication date
2018-07-20
Notes
This paper was accepted for publication in the journal Journal of Fluids and Structures and the definitive published version is available at https://doi.org/10.1016/j.jfluidstructs.2018.07.007.