Vortex-induced vibration effect of extreme sea states over the structural dynamics of a scaled monopile offshore wind turbine

Rotating cylinders submerged in the fluid have many practical applications such as offshore wind turbines and drilling pipes. These rotating cylinders are usually subjected to vortex-induced vibrations, and heat transfer has a great effect on their efficiency. Therefore, it is very important to investigate the heat transfer from the rotating cylinder undergoing vortex-induced vibrations. The present study investigates the flow-induced vibration (FIV) of a rotating circular cylinder, along with the related convective heat transfer, for various mass ratios (mr), rotating rates (α), and a range of reduced velocity (3.0 ≤ ur ≤ 15). The cylinder is modeled as a two-degree-of-freedom system, whereby it is free to oscillate both in the streamwise and transverse directions. The results indicate that the rotational motion of the cylinder significantly enhances the cylinder's displacements in both directions. Furthermore, the displacement amplitude in both directions decreases with an increase in mr. For higher reduced velocities, the displacement amplitude becomes constant. Also, it is observed that increasing mr leads to an improvement in heat transfer for high reduced velocities. Also, the maximum value of the Nusselt number is 15.25 for the non-rotating cylinder and 14 for the rotating cylinder with α=1. The FIV of a rotating circular cylinder exhibits several vortex patterns, including 2S, 2P, P + S, and 2T.

show abstract

Simulation of Ship Berthing Operation at Luojing Container Terminal Under Extreme Sea Conditions

Zhan,

Zhu,

et al. 2024

AJTTE

View full text Add to dashboard Cite

The Luojing Port Area of the Port of Shanghai, specifically the coal terminal and ore terminal, used to be the main port area for coal and ore bulk cargo transportation services in the Port of Shanghai.To enhance the container handling capacity at Shanghai port, this study conducted a series of simulation tests at Luojing Container Terminal. The tests were designed according to the terminal's specifications, taking into account the limit berthing wind direction and wind speed (levels 6 and 7). This study selected an appropriate representative ship type for the comprehensive simulation tests, and it thoroughly tested the berthing limits under various extreme conditions using an advanced navigation simulator. The experiment obtained the motion parameters and trajectory of the simulated ship. Based on these results, this study analyzed and evaluated the safety of the rotary waters and berthing operations, ensuring they met the safety assessment requirements for wharf engineering. The study examined the berthing time window, berthing mode, boundary conditions, and safety guarantee measures under extreme sea conditions at Luojing Container Terminal. Finally, By analyzing the berthing simulation trajectory diagrams, tugboat usage, and vessel maneuvering data under the eight extreme berthing conditions, this study formulated a safe berthing plan for ships.

show abstract

Vortex-induced vibration effect of extreme sea states over the structural dynamics of a scaled monopile offshore wind turbine

Cited by 3 publications

References 58 publications

Effect of Operational Wind-Turbine Vibration on Surface-Dwelling Invertebrates

Effect of Operational Wind-Turbine Vibration on Surface-Dwelling Invertebrates

Effects of mass ratio and rotation speed on flow induced vibration of a rotating cylinder with two degrees of freedom

Simulation of Ship Berthing Operation at Luojing Container Terminal Under Extreme Sea Conditions

Contact Info

Product

Resources

About