Trim Optimization of Ship by a Potential-Based Panel Method

Xujian Lv,Jianglong Sun,Xiaoguang Wu,Haiwen Tu

doi:10.1155/2013/378140

Xujian Lv, Jianglong Sun + Show 2 more

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https://doi.org/10.1155/2013/378140

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Abstract

A surface panel method for a boundary-value problem with the free surface is proposed to predict ship wave resistance under different trim conditions based on a so-called double-model solution. The free surface boundary condition is linearized with respect to the oncoming flow and computed by a four-point finite difference scheme. Sample computation for Wigley hull is carried out to demonstrate the effectiveness and the robustness of the method. A hull model is taken into account at two different displacements with respect to trim conditions of lower wave resistance. It is demonstrated by calculation and experiment that the wave resistance under the trim conditions provided by the proposed method is lower than that under the initial conditions.

Highlights

With respect to green shipping, the main challenge for the hydrodynamics community is to help reduce the ship resistance
For the purpose of reducing the wave-making resistance, a surface panel method involving linearized free surface condition and double model solution proposed by Dawson is developed to optimize ship trim condition
After being verified by the Wigley hull calculation, the method is applied to optimize trim condition of the HUST hull, and the wave resistance is used as the objective function

Summary

Introduction

With respect to green shipping, the main challenge for the hydrodynamics community is to help reduce the ship resistance. Ship resistance has often been taken into account by employing excellent hull forms or hull lines optimization in ship design stage [1,2,3]. Another option to optimize the resistance of ships without modifying the vessel is to consider the operational efficiency of the hull, including the trim operation. Model tests or CFD simulations have been used to assess the best trim and the effect of different trim conditions [6, 7]. Model tests are too costly and further efforts are required to improve the reliability and effectiveness of CFD simulations. A new method is developed to explore better trim conditions for a certain hull with typical wave making being taken into account

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