Simulation strategy of the full-scale ship resistance and propulsion performance

Guo, Chunyu; Sun, Cong; Wang, Chao; Gong, Jie; Li, Ping; Wang, Lianzhou

doi:10.1080/19942060.2021.1974091

Cited by 17 publications

(7 citation statements)

References 37 publications

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“…The sensitivity analysis to mitigate the effects of domain boundaries on the flow near the hull confirmed that a computational domain with dimensions of 180 m (y-direction), 30 m (x-direction) and 45 m (z-direction) is suitable. The upstream and downstream of the ship are assumed to be 1 and 2 times the length of the ship (L Ship ), respectively, which is consistent with the previous studies [21]. The water depth is determined by adding 30 m to the ship's draught (30 m + h Draught ).…”

Section: Problem Statementmentioning

confidence: 98%

Computational analysis of air bubble-induced frictional drag reduction on ship hulls

Mohammadpour,

Salehi,

Garaniya

et al. 2024

J Mar Sci Technol

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About 60% of marine vessels’ power is consumed to overcome friction resistance between the hull and water. Air lubrication can effectively reduce this resistance and lower fuel consumption, and consequently emissions. This study aims to analyze the use of a gas-injected liquid lubrication system (GILLS) to reduce friction resistance in a real-world scenario. A 3D computational fluid dynamics model is adopted to analyse how a full-scale ship (the Sea Transport Solutions Designed Catamaran ROPAX ferry) with a length of 44.9 m and a width of 16.5 m is affected by its speed and draught. The computational model is based on a volume of fluid model using the k-ꞷ shear stress transport turbulence model. Results show that at a 1.5 m draught and 20 knots cruising speed, injecting 0.05 kg/s of compressed air into each GILLS unit reduces friction resistance by 10.45%. A hybrid model of natural air suction and force-compressed air shows a friction resistance reduction of 10.41%, which is a promising solution with less required external power. The proposed technique offers improved fuel efficiency and can help to meet environmental regulations without engine modifications.

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Section: Problem Statementmentioning

confidence: 98%

Computational analysis of air bubble-induced frictional drag reduction on ship hulls

Mohammadpour,

Salehi,

Garaniya

et al. 2024

J Mar Sci Technol

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“…In this study, the average wall y+ value was set to below 2.5 for the model-scale simulations, according to the ITTC recommendations [10], and to 100-200 for the full-scale simulations (this range of values has been proven to be suiTable for full-scale simulations in many studies [11] [12] [13] [14]). The time step for the URANS simulations depends on the properties of the flow [15].…”

Section: Numerical Setupmentioning

confidence: 99%

Investigation of the Scale Effects on Roll Motion for The Ship Bettica Using Numerical Simulation

Phuong,

Yoshida,

Taniguchi

et al. 2024

Polish Maritime Research

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In this paper, we focus on analysing scale effects on the roll motion of the Italian ship Bettica using a numerical method. First, the roll decay motion of the ship is simulated at both the model scale and full scale, and the predicted results are compared with experimental data to validate the numerical strategy. The results show that there are scale effects that cause the difference in roll amplitudes between the model and the full-scale ship. To investigate the viscous effects on the roll damping components, forced roll simulations are carried out at the model scale and full scale, and the roll damping components (frictional, wave-making, eddy-making, bilge keel and lift components) are obtained. An analysis of these roll damping components indicates that the frictional component is influenced by scale effects, especially in the case of zero or low forward speed. We also show that the bilge keel component is affected by scale effects when the height of the bilge keels is reduced to a certain value below the boundary layer thickness. The velocity fields around the bilge keels are analysed to better understand the scale effects.

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“…It is used to ensure the closure equation and has been proven in numerous studies on the hydrodynamic predictions of RDT [16][17][18] and traditional propellers. [19][20][21][22] The transport equations for k and x are as follows:…”

Section: Numerical Details a Governing Equations And Turbulence Modelmentioning

confidence: 99%

Improved efficiency with concave cavities on S3 surface of a rim-driven thruster

Li,

Yao,

Wang

et al. 2023

Physics of Fluids

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Rim-driven thrusters (RDT) are of great interest for the development of integrated electric motors for underwater vehicles. Gap flow is one of the most prominent flow characteristics and plays an important role in the hydrodynamic performance of RDT. In this study, the rim in a carefully designed RDT was modified with several concave cavities defined by four parameters, and their influence on hydrodynamics was carefully calculated and analyzed. The simulations were performed using the k-ω shear stress transport turbulence model by solving the unsteady Reynolds-averaged Navier–Stokes equations. The numerical method was verified using a popular combination. The numerical results showed that the concave cavities on the rim improve the propulsive efficiency of RDT by a maximum of 3.52%. The increase in the propulsive efficiency is directly associated with the parameters of the concave cavities. Nevertheless, the flow in the gap has a negligible effect on the main flow field through the RDT. According to the numerical analysis, the different pressure integrals at the front and back surfaces of the concave cavities are the main reason for the improvement of the propulsive efficiency. The modification of the rim is helpful and practical for the hydrodynamic optimization of the RDT.

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Simulation strategy of the full-scale ship resistance and propulsion performance

Cited by 17 publications

References 37 publications

Computational analysis of air bubble-induced frictional drag reduction on ship hulls

Computational analysis of air bubble-induced frictional drag reduction on ship hulls

Investigation of the Scale Effects on Roll Motion for The Ship Bettica Using Numerical Simulation

Improved efficiency with concave cavities on S3 surface of a rim-driven thruster

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