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1、第13卷第2期中國艦船研究Vol.13No.2第20182期年4月ChineseJournalofShipResearchApr.2018引用格式:王曉聰,桂洪斌,劉洋.三維有限長圓柱繞流數(shù)值模擬[J].中國艦船研究,2018,13(2):27-34.WANGXC,GUIHB,LIUY.Numericalsimulationofthree-dimensionalflowaroundacircularcylinderoffinitelength[J].ChineseJournalofShipResearch,2018,
2、13(2):27-34.三維有限長圓柱繞流數(shù)值模擬王曉聰,桂洪斌,劉洋哈爾濱工業(yè)大學(xué)(威海)船舶與海洋工程學(xué)院,山東威海264209摘要:[目的]為探究有限長圓柱繞流的流動機(jī)理和特性,[方法]采用大渦模擬(LES)數(shù)值模型并結(jié)合渦識別方法,對三維有限長圓柱繞流進(jìn)行數(shù)值模擬,并對有限長圓柱繞流進(jìn)行驗(yàn)證和分析。[結(jié)果]模擬結(jié)果表明,有限長圓柱回流區(qū)相對較短,自由端的下洗作用會擾亂卡門渦街,導(dǎo)致阻力系數(shù)損失;相對于固定壁面,自由端面對順流向速度影響更大;自由端面“蘑菇”渦成對出現(xiàn),且存在2個流動源點(diǎn);有限長圓柱流場存在更明
3、顯的三維特性,阻力系數(shù)更??;圓柱自由端后存在梢渦,圓柱與固定壁面交界處存在“馬蹄”渦。[結(jié)論]所得結(jié)果可對有限長圓柱的流動特性進(jìn)行相對全面的描述,對于理解和研究有限長圓柱繞流機(jī)理具有一定的參考價(jià)值。關(guān)鍵詞:有限長;圓柱繞流;下洗;自由端;大渦模擬中圖分類號:U664.33文獻(xiàn)標(biāo)志碼: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