30 Jun 2023
 | 30 Jun 2023
Status: a revised version of this preprint is currently under review for the journal WES.

Realistic turbulent inflow conditions for estimating the performances of a floating wind turbine

Cedric Raibaudo, Jean-Christophe Gilloteaux, and Laurent Perret

Abstract. A novel method for generating turbulent inflow boundary conditions for aeroelastic computations is proposed, based on interfacing hybrid hot-wire and particle image velocimetry measurements performed in a wind tunnel to a full-scale load simulation conducted with FAST. This approach is based on the use of the proper orthogonal decomposition (POD) to interpolate and extrapolate the experimental data onto the numerical grid. The temporal dynamics of the temporal POD coefficients is driven by the high-frequency hot-wire measurements used as inputs of lower-order model built using a multi time-delay linear stochastic estimation (LSE) approach. Being directly extracted from the data, the generated 3-component velocity fields later used as inlet conditions present correct one- and two-point spatial statistics and realistic temporal dynamics. Wind tunnel measurements are performed at a scale of 1:750, using a properly scaled porous disc as a wind turbine model. The POD analysis of the flow, with or without taking into account the presence of the surge motion of the model, shows that a few modes are able to capture the characteristics of the most energetic flow structures and the main features of the wind turbine wake such as its meandering and the influence of the surge motion. The interfacing method is first tested to estimate the performance of a wind turbine in an offshore boundary layer and then those of a wind turbine immersed in the wake of an upstream wind turbine subjected to a sinusoidal surge motion. Results are also compared to those obtained using the standard inflow generation method provided by TurbSim available in FAST.

Cedric Raibaudo et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2023-60', Anonymous Referee #1, 10 Jul 2023
    • AC1: 'Reply on RC1', Cedric Raibaudo, 27 Jul 2023
  • RC2: 'Comment on wes-2023-60', Anonymous Referee #2, 10 Jul 2023
    • AC2: 'Reply on RC2', Cedric Raibaudo, 27 Jul 2023
  • AC3: 'Tracked changes of the manuscript from the first review', Cedric Raibaudo, 28 Jul 2023

Cedric Raibaudo et al.

Cedric Raibaudo et al.


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Short summary
The methodology presented here proposes to interface experimental measurements performed in a wind tunnel to simulations conducted with the aeroelastic code FAST, applied for a floating wind turbine model under wave-induced motion. FAST simulations using experiments matches well with those obtained using the inflow generation method provided by TurbSim. Highest surge-motion frequencies show a significant decrease on the mean power produced by the turbine, with a mitigation of the flow dynamics.