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An investigation of free-surface effects on the dynamics of two-dimensional oscillating foil thrusters in tandem
Citation Link: https://doi.org/10.15480/882.9346
Publikationstyp
Conference Paper
Date Issued
2024-04-04
Sprache
English
Author(s)
Instituto Superior Técnico, Lisbon, Portugal
blueOASIS, Ericeira Business Factory, Ericeira, Portugal
Instituto Superior Técnico, Lisbon, Portugal
WavEC – Offshore Renewables, Lisbon, Portugal
TORE-DOI
Start Page
727
End Page
736
Citation
8th International Symposium on Marine Propulsors (smp 2024)
Contribution to Conference
Publisher
Norwegian University of Science and Technology, Department of Marine Technology
ISBN
978-82-691120-5-4
Peer Reviewed
true
The present work investigates free-surface effects on the dynamics of tandem oscillating foils in two-dimensional flow. The study comprises the cases in infinite domain, with and without an incident wave. A CFD solver with a URANS approach is used to model the flow around the tandem foil and the effects of the free-surface. A robust deforming grid method is used for body motion modelling, enabling large motions of the foils. Results of wake patterns and forces acting on the foils are presented for a high performance configuration. A complementary study uses a semi-analytical model based on Theodorsen unsteady theory. This formulation is extended to allow for the application to large motions and the interaction of both foils, including free-surface effects, and incident waves. The case of the tandem foil in waves shows very promising results. The high performance configuration reached high values of thrust and propulsive efficiency with increases in thrust of 38% when compared with the sum of two isolated single foils.
Subjects
Oscillating hydrofoils
Wave propulsion
Tandem foil
Hydrofoil modelling
CFD
DDC Class
620: Engineering
Publication version
publishedVersion
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Name
Lopes-AnInvestigationOfFreesurfaceEffectsOnTheDynamicsOfTwodimensional-1166-1-final.pdf
Type
Main Article
Size
1.74 MB
Format
Adobe PDF