A Numerical Study on the Performance of the 66k DWT Bulk Carrier in Regular and Irregular Waves

Kim, Gu-Hyeon; Hwang, Seunghyun; Lee, Soon-Hyun; Lee, Jun-Hee; Hwangbo, Jun; Kim, Kwang-Soo; Paik, Kwang-Jun

doi:10.3390/jmse11101913

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…In complex sea conditions, the environmental loads, such as wind, waves, and currents, inevitably lead to the roll and pitch motion responses of ships and floating platforms [1][2][3], affecting the regular operation of equipment and causing safety risks to personnel. Therefore, it is necessary to choose appropriate anti-roll methods to ensure the motion stability of ships and platforms under load disturbances.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flow Instability and Mechanical Energy Loss of Fluid Field in Fluid Momentum Wheel

Zhang,

Wang,

Liu

et al. 2024

JMSE

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A new type of anti-rolling device denoted as a fluid momentum wheel (FMW) is proposed to address the limitations of traditional gyrostabilizers in reducing the roll responses of floating platforms in waves. The proposed device is based on the same gyroscope theorem, which differs from a rigid gyrostabilizer in that the internal fluid generates secondary flow in the cross-section under the combined effects of inertial centrifugal force and a radial pressure gradient, and the streamwise velocity exhibits a non-uniform distribution. These instability phenomena may cause mechanical energy loss in the flow field, which is critical for selecting the driving device and the anti-roll control performance of offshore platforms. In the study, different turbulence models are compared with the results of a Direct Numerical Simulation (DNS) and experiments to ensure the accuracy of the numerical method, and the spatiotemporal distribution characteristics of the flow field in FMW are analyzed. Therein, the SST k-ω model accurately verifies the flow instability phenomenon of the FMW observed in the Particle Image Velocimetry (PIV) experiment. Next, this paper proposes corresponding evaluation parameters to assess the impact of typical parameters on the flow field instability. The results show that the flow instability increases with an increase in the typical parameters of FMWs (such as the pipe diameter, curvature radius, and velocity). Furthermore, the paper discusses the relationship between dimensionless mechanical factors (Reynolds number, curvature ratio) and the spatiotemporal instability of the flow field, revealing the essential effects of the curvature ratio and Reynolds number on the loss coefficient.

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Section: Introductionmentioning

confidence: 99%