An experimental investigation of nonlinear wave loading on a vertical cylinder – Stokes type expansion and secondary load cycle

Tang, Tianning and Ding, Haoyu and Dai, Saishuai and Taylor, Paul H. and Zang, Jun and Adcock, Thomas (2023) An experimental investigation of nonlinear wave loading on a vertical cylinder – Stokes type expansion and secondary load cycle. In: 38th International Workshop on Water Waves and Floating Bodies, 2023-05-07 - 2023-05-10.

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Abstract

Offshore structures, including offshore wind turbine foundations, marine renewable energy device support structures, bridge piers, and floating vessels, are routinely exposed to harsh environmental loads. These frequently drive the design. The physics and statistics of wave-structure interaction are complex and still not fully understood for non-linear loads as experienced in the most severe conditions. This paper analyses loads in focused waves and random sea-states on a bottom-mounted vertical cylinder in the regime relevant to fixed offshore wind turbines. We compare high-quality wave tank measurements, fully nonlinear viscous model simulations, and novel Gaussian Process model predictions based on previous experiments. We consider the Stokes-type force including high-order harmonics. In addition, the secondary load cycle plays a role in the ringing response of the cylinder (e.g. [1, 2, 3]). We also investigate the physics with a novel three-phase decomposition and wavelet analysis.

ORCID iDs

Tang, Tianning, Ding, Haoyu, Dai, Saishuai ORCID logoORCID: https://orcid.org/0000-0002-9666-6346, Taylor, Paul H., Zang, Jun and Adcock, Thomas;
CORE (COnnecting REpositories)