Numerical study on bank effects for a ship sailing in shallow channel

Yao, Jianxi; Zou, Zao‐jian; Wang, Huaming

doi:10.1007/s12204-011-1100-0

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…They distributed free and wall surface panels onto which Rankine sources of constant strength are mapped. Yao et al (2011) validated their results with experimental data which showed good agreement.…”

Section: Introductionmentioning

confidence: 53%

“…Alderf et al (2008) developed their approach to validate the stability model as an extension of the method proposed by Janssen and Schijf (1953), who predicted the unstable squat positions for ships. Yao et al (2011) produced and tested their theory for a Series 60 hull (CB = 0.6). They calculated the shallow water effects in terms of sinkage, trim, resistance and wave patterns for sub-and supercritical speeds on a ship by discretising the hull by a panel method.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental study on hydrodynamic performance of ships advancing through different canals

et al. 2020

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In international shipping, there are several waterways that are widely viewed as bottlenecks. Among these is the Suez Canal, where recent expansions have taken place. Although the Suez Canal has a high importance in international shipping, little research has been carried out in maximising the number of ships capable of traversing for a set period of time. The present study aims to examine hydrodynamic phenomena of ships advancing through the Suez Canal in the allowed speed range to determine the relative effects of the canal depth and /or width restrictions on the overall ship sailing performance. A rectangular canal is also included as a reference to gauge the effects of varying canal cross-section. The present study combines experimental, numerical, analytical and empirical methods for a holistic approach in calm water. As a case-study, the KCS hullform is adopted, and analysed experimentally, via Computational Fluid Dynamics, using the slender body theory, and empirical formulae. The results reveal strong coupling between the canal's cross section and all examined parameters.

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Section: Introductionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on hydrodynamic performance of ships advancing through different canals

et al. 2020

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“…However, they are very close. The existence of wavemaking phenomenon will produce a result similar to the bank effect 25 of inshore voyages. The ''bank effect'' refers to the tendency of the stern of a ship to swing toward the near bank when operating in a river or constricted waterway.…”

Section: Results Analysis Of Near-surface Motionmentioning

confidence: 97%

Stability and economy analysis based on computational fluid dynamics and field testing of hybrid-driven underwater glider with the water quality sensor in Danjiangkou Reservoir

Wang

2015

Advances in Mechanical Engineering

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Hybrid-driven underwater glider is a new kind of unmanned platform for water quality monitoring. It has advantages such as high controllability and maneuverability, low cost, easy operation, and ability to carry multiple sensors. This article develops a hybrid-driven underwater glider, PETRELII, and integrates a water quality monitoring sensor. Considering stability and economy, an optimal layout scheme is selected from four candidates by simulation using computational fluid dynamics method. Trials were carried out in Danjiangkou Reservoir-important headwaters of the Middle Route of the South-to-North Water Diversion Project. In the trials, a monitoring strategy with polygonal mixed-motion was adopted to make full use of the advantages of the unmanned platform. The measuring data, including temperature, dissolved oxygen, conductivity, pH, turbidity, chlorophyll, and ammonia nitrogen, are obtained. These data validate the practicability of the theoretical layout obtained using computational fluid dynamics method and the practical performance of PETRELII with sensor.

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“…Unmanned ships are widely used in marine exploration and development, island reef resupply, marine environmental monitoring, improving the energy efficiency and environmental performance of ports and terminals [1]. In unmanned ships, miniaturization, intelligent direction of development [2,3], lack of dock dynamic berthing are pursued; Berthing is affected by the shallow water effect, the shore wall effect, as well as by navigation, speed, speed reduction, wind speed, and wind direction, and other factors [4][5][6][7][8]. Automatic berthing is not an easy task because of various factors, such as the non-linearity of the low-speed maneuvering model, danger of collision with the berth, etc.…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation of the Safety of Unmanned Ship Berthing under the Influence of Various Factors

et al. 2021

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The safety of unmanned ship berthing is of paramount importance. In order to explore the influence of wind and wave coupling, a berthing computational fluid dynamics (CFD) model was established, and the characteristics of speed field, pressure field, and vortex have been obtained under different speed, wind direction, and the quay wall distances. The results show that the total resistance of the hull against the current can be about 1.60 times higher compared to the downstream resistance, water flow resistance is the dominant factor, accounting for more than 80% of the total resistance. When changing the distance between ship and shore at fixed speed, the results found that the torque is small, but the growth rate is very large when driving below 2 m/s, and the torque growth rate is stable above 2 m/s. Based on the established coupling model, a multi-factor berthing safety study is carried out on an actual unmanned ship. The results show that when the speed increases from 4 m/s to 12 m/s, the curve slope is small, the resistance increases from 3666 N to 18,056 N, and the rear slope increases. The pressure increases with the speed, and when the speed is 24 m/s, the maximum pressure is up to 238,869 Pa. When the wind speed is fixed, the vertical force of the unmanned ship increases first and then decreases to zero and then reverses the same law change, and the maximum resistance is about 425 N at the wind angle of about 45 degrees; At 90 degrees, the maximum lateral force on an unmanned boat is about 638 N. The above results can provide control strategy for unmanned ship berthing safety, and provide theoretical basis for unmanned ship route planning and obstacle avoidance, safety design, etc.

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Numerical study on bank effects for a ship sailing in shallow channel

Cited by 8 publications

References 1 publication

Numerical and experimental study on hydrodynamic performance of ships advancing through different canals

Numerical and experimental study on hydrodynamic performance of ships advancing through different canals

Stability and economy analysis based on computational fluid dynamics and field testing of hybrid-driven underwater glider with the water quality sensor in Danjiangkou Reservoir

CFD Simulation of the Safety of Unmanned Ship Berthing under the Influence of Various Factors

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