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Estimation method for life-cycle fuel consumption of merchant ships

商船全生命周期油耗估算方法

基本信息

批准号：
16360432
负责人：
MIYATA Hideaki
金额：
$ 6.98万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

In recent years, the importance has been recognizing for the rigorous predictions of life-cycle (LC) fuel consumption of ships to evaluate the life-cycle value (LCV) of ships. From a ship design point of view, it is of crucial importance to establish reliable methods for the accurate prediction of ship performance in the realistic wave environment as a design analysis tool. To achieve this objective, a new prediction procedure based on CFD ship motion simulation is developed for predicting ship performance in a seaway in the present study. This has been intended for the establishment of the evaluation method of LC fuel consumption.Two versions of the CFD ship-motion simulation code named WISDAM-X and WISDAM-XI are described with a number of application examples. Since the non-linear free-surface and body-surface conditions are satisfied exactly on the moving ship body surface in the framework of overlapping grid system (WISDAM-X) or multi-block grid system (WISDAM-XI), both codes cope with arbitrary ship motions in arbitrary wave conditions. The WISDAM-X code is especially used for the design of conventional type ships. The simulation results demonstrate that the computed pressure on the surface of the bow-part shows fairly good agreement with the measured data in a wide range of wave conditions. The simulations of the cases in the oblique waves elucidate the formation of unsteady free-surface- shock-wave which plays an important role for the added resistance. The WISDAM-XI code is used for the prediction of hydrodynamic performance of multihull vessels. Resistance and seakeeping performance of monohull, catamaran and trimaran vessels is estimated by the CFD code and they are validated through comparison with experiments.

近年来，对船舶全寿命燃油消耗量进行严格的预测，以评估船舶的全寿命价值的重要性日益受到重视。从船舶设计的角度来看，建立可靠的方法来准确预测船舶在现实波浪环境中的性能，作为设计分析工具是至关重要的。为了实现这一目标，一个新的预测程序的基础上CFD船舶运动模拟预测船舶性能在本研究中。介绍了CFD船舶运动模拟软件WISDAM-X和WISDAM-XI的两个版本，并给出了应用实例。由于在重叠网格系统（WISDAM-X）和多块网格系统（WISDAM-XI）框架下，运动船体表面上的自由面和体面条件均严格满足，因此这两种程序都科普任意波浪条件下的任意船舶运动。WISDAM-X程序主要用于常规船型的设计。模拟结果表明，在较宽的波浪条件下，船首部分表面压力的计算值与实测值吻合较好。通过对斜波情况的数值模拟，阐明了非定常自由表面激波的形成，它对附加阻力起着重要的作用。WISDAM-XI程序用于预报多体船的水动力性能。利用CFD程序计算了单体、双体船和三体船的阻力和耐波性，并与试验结果进行了比较。