Abstract

There is a need for new numerical tools to capture the physics of floating wind platforms more accurately to refine engineering designs and reduce costs. The conventional measurements apparatus in tank tests, including wave probs, velocity and current profiler, as well as doppler sensors, are unable to give a full 3D picture of velocity, pressure, and turbulence. In tank testing, the use of the underwater stereoscopic PIV method to fully characterise the 3D flow field around floating platforms can provide a rich source of validation data and overcome some of the limitations associated with more classical measurement techniques. This optical technique can be used to accurately measure the random and chaotic structure of turbulent flows around the floater. Moreover, the main characteristics of turbulence of the flow around the floater, such as rotationality, diffusivity, irregularity, as well as dissipation, can be extracted and studied. The underwater S-PIV method has been widely used for marine and offshore applications, including studies on ship and propeller wakes and tidal stream turbines; however, to date, this technology has not seen widespread use for the hydrodynamic study of floating offshore wind turbines. Therefore, in the current study, the key considerations for using S-PIV for this purpose are discussed; meanwhile, the related studies in the field of quantitative flow measurements are reviewed.

Highlights

  • The use of the underwater stereoscopic PIV method to fully characterise the 3D flow field around floating platforms can provide a rich source of validation data and overcome some of the limitations associated with more classical measurement techniques

  • This paper has presented a review of the use of stereoscopic particle image velocimetry (S-PIV) in tank testing campaigns

  • It is discussed that Underwater S-PIV has been used for the hydrodynamical study of other marine and offshore applications, including ship models, tidal stream turbines and propellers

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Summary

Introduction

Considering the 30 MW Hywind Scotland, the 24 MW WindFloat project in Portugal and upcoming projects including 30 MW EFGL in France and 88 MW Hywind Tampen (WindEurope, 2020), Europe is on course to become a world leader in floating offshore wind. Some researchers use the S-PIV technique to study other marine renewable technologies (Day et al, 2015); the use of underwater S-PIV for FOWT’s tank testing is an emerging field This method can be used to fully characterise the 3D flow field around floating platforms in the laboratory environment, provide a rich source of validation data and overcome some of the limitations associated with conventional measuring equipment of fluid flow (Chen et al, 2020). This technique has not seen widespread use in FOWT tank test campaigns to date. The cross-correlation method enables us to locate the particles groups in each time step; so that having the time step and particles group displacement results in having the velocity vectors and 150 contours

State of the art of Particle Image
Particle seeds
Illumination Lasers are one of the integral components of PIV tests
CCD cameras and image processing
Vortex induced vibration and motion
Nonlinear wave loads The S-PIV result could be used to study of the
Short-crested waves In comparison to slender members of
Marine growth influence on loads
Breaking/steep wave loads
Viscous load model 495
Multi-body flow interaction 510
Findings
Conclusions
Full Text
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