船舶cfd网格自动生成技术的开发与其应用

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1、上海交通大学工程硕士学位论文摘要启动Gambit自动运行批处理文件并更新点线面信息，根据船体曲面形状特性、计算要求等条件，软件通过参数化来控制并完成计算区域的划分、网格生成及边界条件的设置。以KVLCC2M、TEU3100和另一艘集装箱船船模IGES文件校验程序。针对KVLCC2M就CFD阻力性能预报和操纵性能预报的网格依赖性做了研究；对TEU3100，深入讨论了船体尾部变形对船舶阻力性能、操纵性能，特别是对推进性能的影响；对另一集装箱船，就混合型网格和结构化网格在自由面预报方面的优缺点进行了对比。结果表明，软件HIGOT和SUGOT能实现普通船舶CFD计算用网格的自

2、动生成，可以极大地节省船舶CFD计算时网格生成的时间，为最终实现系统地数值优化船型奠定了基础。关键词：CFD；网格自动生成；船舶粘性流场；自由面第II页万方数据上海交通大学工程硕士学位论文ABSTRACTGridAuto-GenerationTechniqueandItsApplicationontheNumericalPredictionofShipHydrodynamicPerformanceABSTRACTInrecentyears,withtherapiddevelopmentofcomputerscienceandnumericalmathematics,r

3、esearchesonproblemsoffluidmechanicshavesteppedintotheComputationalFluidDynamics(CFD)era,especiallywhenthecommercialCFDpackagesaregettingmaturenow.Asanimportantbranchofhydrodynamics,moreandmoreattentionispaidtoCFDmethodology.Inthefieldofnavalarchitecture,itmakesgreatsensetoimprovethecalc

4、ulationaccuracyandefficiencyofCFDtechnique.AndadefinitetrendistoapplyCFDmethodologyinshiphulloptimizationandnovelhullformdevelopment,namelytodeveloptheoptimalhullformonthebasisofnumericalsimulationsfromtheviewpointofhydrodynamicperformance.Gridgenerationisoneofthemostsignificantaspectsf

5、ornumericalcomputation,andgridqualityplaysanessentialroleinthecalculationprecisionoffinalresults.Itneedsmuchprofessionalknowledgeandexpertisetogeneratethehigh-qualitycomputationalgrids.Generally,ittakesashipCFDengineeralotoftimeandefforttogenerateasetofhigh-qualitycomputinggrids,whichhi

6、ndersfurtherapplicationofCFDinshipengineering.Furthermore,intheprocessofintroducingCFDmethodintothefieldofshapeoptimizationandnovelhullformdevelopment,alargeamountoftimeisspentingeneratingmeshesforhullformsthataresimilaringeometry,whichdecreasesefficiencygreatly.Inordertoimprovetheeffic

7、iencyofnavalCFDcomputationandnumericalshipformoptimization,hybridgridauto-generationsoftwareHIGOTandstructuredgridauto-generationsoftwareSUGOTaredeveloped第III页万方数据上海交通大学工程硕士学位论文ABSTRACTonthebasisofthegeneralCFDpreprocessorGambit.Theapplications,HIGOTandSUGOT,startingwiththeIGES