权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Research on Propulsive Performance of Ships by Means of Computational Fluid Dynamics

计算流体动力学研究船舶推进性能

基本信息

批准号：
07455395
负责人：
IKEHATA Mitsuhisa
金额：
$ 4.22万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

The computer program cade by the surface vortex lettice method has been employed to analyze hydrodynamic characteistics of a propeller in the laboratory of maretime by hydrodynamics of Yokohama National University, However, the code is too heavy for a computer and consumes too much time. In this year two tasks has been carried out in this research project, One is the evelopment of the computer program code by the sarface panel method as the altenative cade to analyze the hydrodynamic characteristics of peopellers. The other is the development of the conputer program cade by Raukine source method to calculate theoretically the waves and wave making resistance of a multi-hulls ship, such as a catsmeran or a trimear. The surface panel method and Rankine sowce method both belong to the category of the boundary element method mathematically. They have advantage of availability to not only non-lifting bodies but also lifting bodies. Furthermore, since their algorisms are relatively simyple and easy to understand, the labow of programiing is fairly less and the computing time is also shorter than thesurface vortex lettics method. In this year three important results have been obtained by such new computer cades. One is the solution of the velocity field around a merine propeller by application of Dirichlet's principle, such as the cross flows on the face side and teh back side of the blade. The secondis the development of computer design mehod of a 3-dimensional wing, the section of which is able to realize the previously given prssure distributioin as the object function. The final is the computation generated waves and wave making resistance of a trimaran first all over the world.

在日本横滨国立大学水动力学实验室，用表面涡纹法编制的计算机程序，对螺旋桨的水动力特性进行了分析。本研究项目在今年内完成了两项工作：一是开发了以面元法为替代手段的计算程序，用于分析人船的水动力特性;二是用Raukine源法编制了计算多体船（如双体船、三体船）兴波阻力的计算机程序cade。面元法和朗肯索法在数学上都属于边界元法的范畴。它们不仅对非升力体而且对升力体都具有可用性的优点。而且由于它们的算法比较简单易懂，所以计算工作量和计算时间都比表面涡量法要少得多。这类新的计算机科学家今年已取得三项重要成果。一种是应用狄利克雷原理求解船用螺旋桨的速度场，如桨叶正面和背面的横流。二是发展了以给定压力分布为目标函数的三维机翼截面的计算机设计方法。最后，在世界上首次计算了三体船的兴波和兴波阻力。