Numerical and Experimental Study on Seakeeping Performance of a High-Speed Trimaran with T-foil in Head Waves

Li, Ang; Li, Yunbo

doi:10.2478/pomr-2019-0047

Cited by 15 publications

(3 citation statements)

References 25 publications

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“…Ebrahimi et al [16] proposed a planing catamaran with transverse steps, analysed the aero-hydrodynamic effect in calm water at different displacements, and numerically calculated the resistance, the results of which agreed well with the experimental data. Li et al [17] investigated the seakeeping characteristics of a slender trimaran equipped with and without a T-foil near the bow by experimental and numerical methods. The numerical simulations were validated by comparisons with the experimental tests.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Liu

Yang

et al. 2023

Polish Maritime Research

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“…The effect of radical hull shape changes can be analysed using computer simulations (strip or panel methods, CFD) [45]. The obtained research data can be used to increase the ship propulsion efficiency, and improve the safety and comfort of ship operation [26], [52], [53], [54], [55], [56]. However, bearing in mind enormous cost of shipbuilding, the predicted seakeeping characteristics obtained from numerical analyses for the ship to be built should be finally verified using experimental methods (in the towing tank, for instance).…”

Section: Introductionmentioning

confidence: 99%

Determination of Seakeeping Performance for a Case Study Vessel by the Strip Theory Method

Niklas

Karczewski

2020

Polish Maritime Research

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The increase of seakeeping performance is of particular importance for car and passenger ferries, service ships in the gas and oil extraction industry and offshore wind power farm industry, as well as for special purpose ships (including military applications). In the water areas of the Baltic Sea, North Sea, and Mediterranean Sea, which are characterised by a short and steep wave, the hull shape has a substantial impact on the operational capacity and propulsion efficiency of the ship, as well as on comfort and safety of navigation. The article analyses selected aspects of seakeeping for four variants of a selected case study vessel, indicating practical limitations of the strip method. The analysed aspects included hull heaving and pitching, added resistance, Motion Thickness Indicator (MSI), and Subjective Magnitude (SM). Experimental tests were also performed in the towing tank. Their comparison with the numerical results has indicated high inaccuracy of the strip method. What is more, the simplified representation of hull shape used in the strip method makes it impossible to analyse the effect of hull shape changes on the predicted seakeeping characteristics. Especially for the case of head wave, neglecting highly non-linear phenomena, such as slamming or head wave breaking, in strip method-based computer simulations will significantly decrease the reliability of the obtained results. When using the strip method, the seakeeping analysis should be complemented with model tests in a towing tank, or by another more complex numerical analysis, such as CFD for instance.

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“…[2][3][4] Likewise, in the vertical motion reduction of a ship, the appendages were generally selected as fin, T-foil, flapping foil, and trim tab. [5][6][7][8][9] Due to the particularity of the structure and the requirement to reduce vertical motion, some commonly used appendages, such as antiroll tank and fin stabilizer, are not suitable for a trimaran. To reduce the vertical motion, it is more suitable to install appendages at the bow and aft because a trimaran is relatively long and slender.…”

Section: Introductionmentioning

confidence: 99%

Study on vertical motion reduction of a trimaran based on collaborative controlled appendages

Liu

Zheng

Guo-sheng

et al. 2020

International Journal of Advanced Robotic Systems

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In recent years, the trimaran as a novel ship has been greatly developed. The subsequent large vertical motion needs to be studied and resolved. In this article, an experimental study for a trimaran vertical stabilization control is carried out. Three modes including the bare trimaran (the trimaran without appendages, the trimaran with fixed appendages, and the trimaran with controlled appendages) are performed through model tests in a towing tank. The model tests are performed in regular waves. The range of wave period is 2.0–4.0 s, and the speed of the carriage is 2.93 and 6.51 m/s. The results of the three modes show the fixed appendages and the actively controlled appendages are all effective for the vertical motion reduction of the trimaran. Moreover, the controlled appendages are more effective for the vertical stability performance of the trimaran.

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Numerical and Experimental Study on Seakeeping Performance of a High-Speed Trimaran with T-foil in Head Waves

Cited by 15 publications

References 25 publications

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

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

Determination of Seakeeping Performance for a Case Study Vessel by the Strip Theory Method

Study on vertical motion reduction of a trimaran based on collaborative controlled appendages

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