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大小:3.10 MB
页数:8页
时间:2019-05-21
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1、第13卷第2期中国舰船研究Vol.13No.2第20182期年4月ChineseJournalofShipResearchApr.2018引用格式:王晓聪,桂洪斌,刘洋.三维有限长圆柱绕流数值模拟[J].中国舰船研究,2018,13(2):27-34.WANGXC,GUIHB,LIUY.Numericalsimulationofthree-dimensionalflowaroundacircularcylinderoffinitelength[J].ChineseJournalofShipResearch,2018,
2、13(2):27-34.三维有限长圆柱绕流数值模拟王晓聪,桂洪斌,刘洋哈尔滨工业大学(威海)船舶与海洋工程学院,山东威海264209摘要:[目的]为探究有限长圆柱绕流的流动机理和特性,[方法]采用大涡模拟(LES)数值模型并结合涡识别方法,对三维有限长圆柱绕流进行数值模拟,并对有限长圆柱绕流进行验证和分析。[结果]模拟结果表明,有限长圆柱回流区相对较短,自由端的下洗作用会扰乱卡门涡街,导致阻力系数损失;相对于固定壁面,自由端面对顺流向速度影响更大;自由端面“蘑菇”涡成对出现,且存在2个流动源点;有限长圆柱流场存在更明
3、显的三维特性,阻力系数更小;圆柱自由端后存在梢涡,圆柱与固定壁面交界处存在“马蹄”涡。[结论]所得结果可对有限长圆柱的流动特性进行相对全面的描述,对于理解和研究有限长圆柱绕流机理具有一定的参考价值。关键词:有限长;圆柱绕流;下洗;自由端;大涡模拟中图分类号:U664.33文献标志码:ADOI:10.3969/j.issn.1673-3185.2018.02.004NumericalSimulationofthree-dimensionalflowaroundacircularcylinderoffinitelengt
4、hWANGXiaocong,GUIHongbin,LIUYangSchoolofNavalArchitecture,HarbinInstituteofTechnology,Weihai264209,ChinaAbstract:[Objectives]Inthispaper,inordertostudytheflowcharacteristicsandmechanismofthree-dimensionalflowaroundacircularcylinderoffinitelength,[Methods]anumer
5、icalsimulationusingaLargeEddySimulation(LES)andvortexstructuralclassificationtechnologyiscarriedout,andtheaccuracyofthesimulationisproven.[Results]Whenanalyzingtheflowfield,itisfoundthatthelengthoftherecirculationzoneissmallerforacircularcylinderoffinitelength.
6、Inaddition,thedownstreamfromthefreeendcansuppressthecommonphenomenonofKarman-Vortex-Streetwhichleadstoalossofdrag-coefficient.Comparedwiththefixedwallatthebottom,thefreeendsurfacehasahigherinfluenceontheonstream-wisevelocity.The'mushroom'vortexappearsinpairsand
7、twooriginalpointsexistonthefreeend.Thecircularcylinderoffinitelengthappearstobestronglythree-dimensionalwithalowerdrag-coefficient.Moreover,thereisatipvortexbehindthefreeendandahorseshoevortexinthecylinder-walljunction.[Conclusions]Theresultsofthispapergivearel
8、ativelycomprehensivedescriptionoftheflowcharacteristicsofacircularcylinderoffinitelength,andcanprovideusefulreferencesforrelevantresearch。Keywords:finitelength;flowaroundcir
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