The comparison on resistance performance and running attitude of asymmetric catamaran changing shape of tunnel stern exit region

Kim, Sangwon; Lee, Gyeong-Woo; Seo, Kwang-Cheol

doi:10.1088/1757-899x/383/1/012047

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…the total resistance coefficient, 𝐶𝐶 𝑡𝑡 = 𝐶𝐶 𝑓𝑓 + 𝐶𝐶 𝑟𝑟 + ∆𝐶𝐶 𝐹𝐹 ; 𝐶𝐶 𝑓𝑓 is the frictional resistance 𝐶𝐶 𝑟𝑟 is the residual resistance coefficient; ∆𝐶𝐶 𝐹𝐹 is the correction coefficient, which is s the density of seawater, 𝑘𝑘𝑘𝑘 𝑚𝑚 3 ⁄ ; 𝜌𝜌 is the wet surface area of the hull, 𝑚𝑚 2 ; 𝑉𝑉 is the 𝑠𝑠 ⁄ . nal resistance coefficient 𝐶𝐶 𝑓𝑓 is obtained based on the equivalent plank assumption, etermined by the International Towing Tank Conference (ITTC) [30], that is: where C t is the total resistance coefficient, C t = C f + C r + ΔC F ; C f is the frictional resistance coefficient; C r is the residual resistance coefficient; ΔC F is the correction coefficient, which is 0.0004; ρ is the density of seawater, kg/m 3 ; S is the wet surface area of the hull, m 2 ; V is the hull speed, m/s⁄ .…”

Section: Calculation Results and Analysismentioning

confidence: 99%

“…where 𝐶𝐶 𝑡𝑡 is the total resistance coefficient, 𝐶𝐶 𝑡𝑡 = 𝐶𝐶 𝑓𝑓 + 𝐶𝐶 𝑟𝑟 + ∆𝐶𝐶 𝐹𝐹 ; 𝐶𝐶 𝑓𝑓 is the fric coefficient; 𝐶𝐶 𝑟𝑟 is the residual resistance coefficient; ∆𝐶𝐶 𝐹𝐹 is the correction coef 0.0004; 𝜌𝜌 is the density of seawater, 𝑘𝑘𝑘𝑘 𝑚𝑚 3 ⁄ ; 𝜌𝜌 is the wet surface area of the hu hull speed, 𝑚𝑚 𝑠𝑠 ⁄ . The frictional resistance coefficient 𝐶𝐶 𝑓𝑓 is obtained based on the equivalent p which was determined by the International Towing Tank Conference (ITTC) [30],…”

Section: Calculation Results and Analysismentioning

confidence: 99%

“…In recent years, multi-hulls have been widely studied by a large number of researchers because of their wide deck area, excellent speed, and seakeeping performance. The catamaran is one of the most widely studied and applied hull forms, with relatively variable designs, including the small waterline catamaran (SWATH), wave-piercing catamaran, partial air cushion support catamaran (PACSCAT) [1][2], asymmetric catamaran [3][4][5], supercritical catamaran [6], etc. Trimarans and pentamarans mostly use the form of a large main hull in the middle and small demihulls distributed on both sides of the main hull, while the hull forms are mostly slender or small waterline hulls.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Resistance Characteristics of a Novel High-Speed Quadramaran

Liu

Yang

et al. 2023

Polish Maritime Research

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This paper utilised computational fluid dynamics (CFD) technology to calculate the resistance of a novel high-speed quadramaran in calm water using the Navier‒Stokes (N‒S) equation, analysed the total resistance, frictional resistance, and residual resistance characteristics of this novel high-speed quadramaran at different length Froude numbers, and compared them with the results of a conventional high-speed catamaran with the same displacement. The results showed that the total resistance of the quadramaran had a significant hump at the Froude number of 0.6, due to the complexity of the wave interference among the four demihulls, and the hump value was about 1.6 times that of the catamaran. Above the hump speed, the total resistance of the quadramaran decreased with the increase of the Froude number, until reaching the Froude number of 1.06, when the curve became flat, and it showed a maximum resistance reduction of 40% at the Froude number of 1.66 compared with the catamaran, where the total resistance curve was steep. The frictional resistance of the quadramaran increased gradually with the growth of the Froude number, which was basically consistent with the change trend of the catamaran. The residual resistance of the quadramaran first rose and then reduced with the rising Froude number, the curve showed a large hump due to the adverse wave interference, and the hump value was about 1.7 times that of the catamaran. Above the Froude number of 1.06, as the wave interference changed from adverse to favourable, the quadramaran had lower residual resistance than the catamaran. The bow and stern demihulls of the quadramaran were also analysed for their resistance characteristics. The total resistance of the bow demihulls increased gradually with the increase of the Froude number, the curve had a small hump at the Froude number of 0.7, and above the hump speed, the curve was steep. The total resistance of the stern demihulls first increased and then decreased with the growth of the Froude number, the hump value at the Froude number of 0.85 was significant and was about 2 times that of the bow demihulls, and the curve became flat above the Froude number of 1.51.

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Section: Calculation Results and Analysismentioning

confidence: 99%

Section: Calculation Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Analysis of Resistance Characteristics of a Novel High-Speed Quadramaran

Liu

Yang

et al. 2023

Polish Maritime Research

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Numerical Prediction of Hydrodynamic Performance of Planing Trimaran with a Wave-Piercing Bow

Shen

2020

JMSE

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The central hull is the most important structure in the planing trimaran. In order to gain insight into the relationship between hydrodynamic performance and main hull shape, experimental tests and numerical simulations were carried out for volume Froude Number (FrΔ) ranging from 1.31 to 4.98. Dynamic sinkage and trim in the Dynamic Fluid Body Interaction (DFBI) six-degree-of-freedom model were considered. A validation study carried out by comparison of experimental test results with numerical results showed good consistency. To analyze the process of tunnel penetration and pressure change at the bottom of the boat, numerical simulation results for free surface, bottom streamline, and pressure distribution around the hull are given. A large triangular high-pressure area was observed in the front of the main hull for all volume Froude numbers. Consequently, the central drainage body, in reference to the profile of single planing craft with distinctive resistance performance, was redesigned into a wave-piercing shape. Total resistance, sinkage, and trim angle of the new model were then predicted by numerical method. The results show that the central drainage body has a significant impact on the hydrodynamic performance of the planing trimaran. Furthermore, the wave-piercing shaped main hull has a drag reduction effect.

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Transformer: A Multifunctional Fast Unmanned Aerial Vehicles–Unmanned Surface Vehicles Coupling System

et al. 2021

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With the continuous development of the maritime economy, the maritime unmanned surface vehicles (USVs) and unmanned aerial vehicles (UAVs) have become important parts of the maritime transportation system. Unmanned vehicles play a pivotal role in water safety management, offshore patrol and maritime rescue. Consequently, this article researches and develops an unmanned aerial vehicle–unmanned surface vehicle (UAV-USV) coupling system with multiple functions. The ship body module, the deformation module and the UAV module are designed by using the modular analysis method, then volume of fluid (VOF) technology and STAR-CCM+ software are applied to analyze the ship resistance before and after deformation and optimize it. The results show that the Transformer has high speed before deformation and stable navigation ability after deformation, and it can navigate in high winds and waves. It has a large reconnaissance range and some radar stealth capability, which can fulfill different tasks, such as maritime patrol, military strike and maritime rescue.

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The comparison on resistance performance and running attitude of asymmetric catamaran changing shape of tunnel stern exit region

Cited by 3 publications

References 4 publications

Numerical Analysis of Resistance Characteristics of a Novel High-Speed Quadramaran

Numerical Analysis of Resistance Characteristics of a Novel High-Speed Quadramaran

Numerical Prediction of Hydrodynamic Performance of Planing Trimaran with a Wave-Piercing Bow

Transformer: A Multifunctional Fast Unmanned Aerial Vehicles–Unmanned Surface Vehicles Coupling System

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