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An experimental study in a wind tunnel is presented to explore the wake of afloating wind turbine subjected to harmonic side-to-side and fore-aft motionsunder laminar inflow conditions. The wake recovery is analysed as a function ofthe frequency of motion, measured by the Strouhal number, St. Our findingsindicate that both directions of motion accelerate the transition to thefar-wake compared to the fixed turbine. The experimental outcomes confirm theCFD results of Li et al. (2022) showing that sideways motions lead to fasterwake recovery, especially for St in [0.3, 0.6]. Additionally, we find thatfore-aft motions also lead to better recovery for St in [0.3, 0.9]. Moreover,we see that the recovery is closely linked to non-linear spatio-temporaldynamics. Special nonlinear dynamical effects are found in the shear layerregion of the wake (y = R). For both directions of motion and St in [0.25,0.55], the noisy wake dynamics synchronise to the frequency of the motion. Forfore-aft motions and St in [0.55, 0.9], the wake shows more complexquasi-periodic phenomena. In fact, the driven frequency and a selfgeneratedmeandering mode emerge and interact non-linearly, as proved by occurring mixingcomponents. Sideways motions result in large spatial structures of meandering.Fore-aft motions induce pulsing of the wake. Both modes are linked to thesynchronisation effect. The quasi-periodic phenomena of fore-aft motions areconnected to meandering mode. Overall, the spatio-temporal phenomena lead tofaster recovery likely due to an increase of momentum transport towards wakecentre.

Enhanced recovery and non-linear dynamics in the wake of a model floating offshore wind turbine submitted to side-to-side and fore-aft motion