CFD investigation on the hydrodynamic loads and motions when ship maneuvers in regular and irregular waves

Ma Chengqian; Hino Takanori; Ma NingTakagi Youhei

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CFD investigation on the hydrodynamic loads and motions when ship maneuvers in regular and irregular waves

机译：CFD investigation on the hydrodynamic loads and motions when ship maneuvers in regular and irregular waves

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摘要

To explore and predict the ship maneuverability in the regular and irregular waves, the zigzag tests, the turning tests, and the course-keeping tests for the model-scale S175 containership under various wave conditions are simulated. The simulations are performed using a structured overset Unsteady Reynolds Averaged Navier-Stokes (URANS) solver with a moving grid. A body force method is adopted to predict the propeller forces. The simulation results are validated by the free-running experiments with satisfactory accuracy, which indicates that the present simulation strategy is effective and reliable. The hydrodynamic loads on the hull and the rudder together with the ship motion characteristics during the maneuvers in waves are obtained. It is concluded that the ship motions and hydrodynamic loads increase with the increase of the wavelength when the wave height is kept constant. The variation trends and magnitudes for low-frequency components of the self-propulsion factors in waves are similar to those in the calm water condition except obvious high-frequency fluctuations due to the wave effect. For the zigzag tests under the long-crested and short-crested irregular waves, the time histories of the yaw and rudder angle are similar. For the turning tests, the amplitude of roll motion in waves is much larger compared with that of the zigzag tests under the same wave condition, and the drift of the trajectory due to the wave is obvious. The current course keeping simulation can be an alternative tool to predict course keeping maneuvers in waves. Furthermore, flow visualizations are presented for providing a better understanding of the wave effect on free-running ship maneuvers.

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来源
《Ocean engineering》 |2022年第4期|113040.1-113040.17|共17页
作者
Ma Chengqian; Hino Takanori; Ma NingTakagi Youhei;
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作者单位

Shanghai Jiao Tong Univ||Yokohama Natl Univ;

Yokohama Natl Univ;

Shanghai Jiao Tong Univ;

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原文格式 PDF
正文语种英语
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关键词
Computational fluid dynamics (CFD); Free-running tests in waves; Long-crested irregular waves; Short-crested irregular waves; Self-propulsion factors in waves;

CFD investigation on the hydrodynamic loads and motions when ship maneuvers in regular and irregular waves

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