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大型或超大型耙吸挖泥船采用优选的双尾鳍线型,同时与带折角线的前体线型有机结合,可有效降低总阻力,提高推进效率。文中结合38 000 m^3耙吸挖泥船带双尾鳍的浅吃水肥大船型的船型特征,利用CFD分析技术对该船的艏艉线型进行设计与优化,模型试验结果表明,优化线型船的航速超过了设计指标,达到设计要求。 相似文献
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基于CFD的KCS船舶艏部型线优化研究 总被引:2,自引:1,他引:1
《江苏船舶》2016,(6):1-6
为实现基于CFD船体型线优化设计,开发了船体型线优化平台,并以KCS船为初始船型,对其艏部型线进行了优化。首先,重点介绍了径向基函数插值的基本原理及其在船体曲面变形中的应用;其次,将该方法与CFD软件及优化算法结合,开发了基于CFD的船体型线优化平台;最后,将该平台应用于KCS船的艏部型线优化设计,获得给定约束条件下阻力性能最优的船体外形。研究结果表明:基于径向基函数船体曲面修改方法是可行的,建立的船型优化平台具有一定的工程应用价值。 相似文献
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基于计算流体动力学(CFD)理论,利用i SIGHT优化设计平台构建一种船型自动优化方法。该方法集成船型变换及自动生成技术、CFD技术及优化算法。优化过程中,编制船型参数化融合模块实现船型变换与SHIPFLOW软件输入数据间的自动连接;采用遗传算法与二次序列规划法相结合的组合优化方法实现从全局探索再到局部空间寻优的整个流程。以某双艉集装箱船为例,优化后船体兴波阻力明显下降,总阻力也得到显著的改善,获得了设计航速下总阻力最小的船艏与船艉线型组合,表明了该方法的可行性与有效性。研究显示,所提出的方法可以获得阻力性能优良的船体型线供设计者参考,具有较强的工程适用性,在基于CFD的船型自动优化方面具有广阔的应用前景。 相似文献
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《江苏科技大学学报(社会科学版)》2017,(5)
我国海洋形势日益严峻,研发公务船有利于增强远海执法能力.选取某型公务船,基于先进的CFD技术,对其原型方案进行数值模拟并与模型试验结果进行对比分析,基于原型,通过对横剖面面积纵向分布,舵、呆木、支架、尾鳍、尾封板和球艏进行优化,获得不同组合的优化线型.CFD数值模拟结果显示:在设计吃水,设计航速工况下,原型方案的CFD数值模拟结果与试验值吻合良好;优化线型的阻力性能较原型降低显著,最大达到25.4%. 相似文献
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选取某近海小型渔政船典型船型,研究艏艉线型和附体对船舶阻力性能的影响。通过对线型、船型系数以及舭龙骨、压浪板、呆木等常规附体对小型渔政船航行性能的影响进行数值模拟分析,优化船舶线型,针对小型渔政船的功能需求选取合适的附体组合形式,并通过实船运行验证优化后的渔政船航行性能有所改善,达到预期目标,可为同型船舶设计提供参考依据。 相似文献
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采用遗传算法进行球鼻艏优化的流体动力计算(英文) 总被引:1,自引:0,他引:1
Computational fluid dynamics(CFD) plays a major role in predicting the flow behavior of a ship.With the development of fast computers and robust CFD software,CFD has become an important tool for designers and engineers in the ship industry.In this paper,the hull form of a ship was optimized for total resistance using CFD as a calculation tool and a genetic algorithm as an optimization tool.CFD based optimization consists of major steps involving automatic generation of geometry based on design parameters,automatic generation of mesh,automatic analysis of fluid flow to calculate the required objective/cost function,and finally an optimization tool to evaluate the cost for optimization.In this paper,integration of a genetic algorithm program,written in MATLAB,was carried out with the geometry and meshing software GAMBIT and CFD analysis software FLUENT.Different geometries of additive bulbous bow were incorporated in the original hull based on design parameters.These design variables were optimized to achieve a minimum cost function of "total resistance".Integration of a genetic algorithm with CFD tools proves to be effective for hull form optimization. 相似文献
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In this research,a commercial CFD code "Fluent" was applied to optimization of bulbous bow shape for a non ballast water ships(NBS).The ship was developed at the Laboratory of the authors in Osaka Prefecture University,Japan.At first,accuracy of the CFD code was validated by comparing the CFD results with experimental results at towing tank of Osaka Prefecture University.In the optimizing process,the resistances acting on ships in calm water and in regular head waves were defined as the object function.Following features of bulbous bow shapes were considered as design parameters: volume of bulbous bow,height of its volume center,angle of bow bottom,and length of bulbous bow.When referring to the computed results given by the CFD like resistance,pressure and wave pattern made by ships in calm water and in waves,an optimal bow shape for ships was discovered by comparing the results in the series of bow shapes.In the computation on waves,the ship is in fully captured condition because shorter waves,λ/Lpp 0.6,are assumed. 相似文献
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