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Abstract
A small sphere fixed at various drafts was subjected to unidirectional broad-banded surface gravity wave groups to investigate nonlinear exciting forces. Testing several incident wave phases and amplitudes permitted the separation of nonlinear terms using phase-based harmonic separation methods and amplitude scaling arguments, which identified third-order forces within the wave frequency range, i.e. third-order first-harmonic forces. A small-body approximation with instantaneous volumetric corrections reproduced the third-order first-harmonic heave forces very well in long waves, and at every tested draft. Further analysis of the numerical model shows these effects are primarily due to instantaneous buoyancy changes, which for a spherical geometry possess a cubic relationship with the wave elevation. These third-order effects may be important for applications such as heaving point absorber wave energy converters, where they reduce the first-harmonic exciting force by ~10% in energetic operational conditions, an important consideration for power capture.
Original language | English |
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Article number | A62 |
Number of pages | 14 |
Journal | Journal of Fluid Mechanics |
Volume | 1009 |
Early online date | 24 Apr 2025 |
DOIs | |
Publication status | Published - 24 Apr 2025 |
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Dive into the research topics of 'Third-order first-harmonic heave exciting forces on a small partially immersed sphere in long waves'. Together they form a unique fingerprint.Projects
- 1 Finished
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Efficiently unlocking full-scale WEC dynamics for industry cost reduction
Draper, S. (Investigator 01), Kurniawan, A. (Investigator 02) & Wolgamot, H. (Investigator 03)
ARC Australian Research Council
1/11/21 → 31/12/24
Project: Research