A Study on Trim Optimization for a Container Ship Based on Effects due to Resistance

Sun, Jichao; Tu, Haiwen; Chen, Yongnian; Xie, De; Zhou, Jiajian

doi:10.5957/josr.60.1.150022

“…trim condition, Froude number) and a response variable (i.e. wave resistance), the response surface methodology is introduced to conduct trim optimization [16,22]. Instead of using a seconddegree polynomial model to approximate the surface, the Lagrange interpolation function is applied to make sure that the effective points from calculation is included in the response sutrface.…”

Section: Trim Optimizationmentioning

confidence: 99%

“…In addition, Sherbaz and Duan assessed the influence of trim on ship resistance with CFD as well [15]. More recently, Sun et al [16] developed a response surface based program with database from experiment and CFD to perform trim optimization. The optimized results had been validated by real ship test as well.…”

Section: Introductionmentioning

confidence: 99%

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2018

brod

0

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The paper aims at conducting trim optimization for a hull to reveal the influence of trim on wave resistance by a potential-based panel method coupled with a response surface method. First, a numerical program for solving the linear free-surface flow problem of a hull moving with a uniform speed in calm water is built by the panel method. The S60 hull model is used to validate the numerical procedure. Next, calculation for hull is performed with two different trims at a wide range of Froude number; resistance test is conducted to validate the numerical method in demonstrating the influence of trim on wave resistance. Finally, a response surface of wave resistance is constructed with respect to variations of trim and Froude number, using the database of wave resistance calculated by the surface method. In this way, a framework is developed to perform trim optimization. The optimum trim point for the present hull shows a significant improvement in both wave resistance and total resistance, compared with that of even keel and the worst trim point. The optimization framework is proved to be effective in energy saving due to resistance reduction.

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“…The principle dimension of the towing tank is 175 × 6 × 4m [16]. According to the ITTC guidelines, the wave resistance coefficient of HUST hull from model test can be written as…”

Section: Sample Calculation and Validationmentioning

confidence: 99%

On Resistance Reduction of a Hull by Trim Optimization

Lyu

¹

,

Tu

²

,

Xie

³

et al. 2017

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Self Cite

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The paper aims at conducting trim optimization for a hull to reveal the influence of trim on wave resistance by a potential-based panel method coupled with a response surface method. First, a numerical program for solving the linear free-surface flow problem of a hull moving with a uniform speed in calm water is built by the panel method. The S60 hull model is used to validate the numerical procedure. Next, calculation for hull is performed with two different trims at a wide range of Froude number; resistance test is conducted to validate the numerical method in demonstrating the influence of trim on wave resistance. Finally, a response surface of wave resistance is constructed with respect to variations of trim and Froude number, using the database of wave resistance calculated by the surface method. In this way, a framework is developed to perform trim optimization. The optimum trim point for the present hull shows a significant improvement in both wave resistance and total resistance, compared with that of even keel and the worst trim point. The optimization framework is proved to be effective in energy saving due to resistance reduction.

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“…The variation in the ship's attitude is one of the factors that can directly affect the resistance performance [7][8][9]. As the resistance acting on the ship can increase or decrease according to the ship's attitude, an analysis that considers the superstructure is required for an accurate estimation of resistance performance.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Air Resistance with and without a Superstructure on a Container Ship Using Numerical Simulation

Seok

¹

,

Park

²

2020

JMSE

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This study investigated the resistance performance of ships, using the air resistance correction method. In general, air resistance is calculated using an empirical formula rather than a direct calculation, as the effect of air resistance on the total resistance of ships is relatively smaller than that of water. However, for ships with large superstructures, such as container ships, LNG (liquefied natural gas) carriers, and car-ferries, the wind-induced effects might influence the air resistance acting on the superstructure, as well as cause attitude (trim and sinkage) changes of the ship. Therefore, this study performed numerical simulations to compare the total resistance, trim, and sinkage of an 8000 TEU-class container, ship with and without superstructures. The numerical simulation conditions were verified by comparing them with the study results of the KCS (KRISO Container Ship) hull form. In addition, the differences in the above values between the two cases were compared using the coefficients calculated by the empirical formula to identify the effects on the air resistance coefficient.

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A Study on Trim Optimization for a Container Ship Based on Effects due to Resistance

Cited by 22 publications

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On Resistance Reduction of a Hull by Trim Optimization

Comparative Study of Air Resistance with and without a Superstructure on a Container Ship Using Numerical Simulation

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