摘要Ⅰ摘要Ⅰ摘要當(dāng)流體流過相對(duì)靜態(tài)的鈍性結(jié)構(gòu)或物體時(shí)，鈍性的物體或主體將承受由于流體和渦流的分離而產(chǎn)生的連續(xù)脈動(dòng)流動(dòng)力的作用。因此，該結(jié)構(gòu)必須足夠堅(jiān)固以承受沖擊。鈍體繞流的工程應(yīng)用非常多樣，例如飛機(jī)機(jī)翼之間的立柱，潛水器的通風(fēng)管，高壓管線，發(fā)電廠的冷卻塔，橋梁，高層建筑，熱交換器的管。熱量和更多。在生產(chǎn)的實(shí)際生活中，普遍存在的普遍問題是需要盡可能降低流體的阻力。因此，長(zhǎng)期以來一直尋求在涉及粘性流體運(yùn)動(dòng)的所有區(qū)域中減小從水下運(yùn)動(dòng)物體到航天飛機(jī)的流體阻力。本文使用Fluent軟件的RNGk-e模型對(duì)具有亞臨界雷諾數(shù)的粘彈性流體的圓柱和方柱周圍的旋轉(zhuǎn)問題進(jìn)行了數(shù)值研究。通常，Re數(shù)越高，方柱的電阻越大，而圓柱體則不是這種情況。Re越高，兩個(gè)氣缸的升程越高。對(duì)于圓柱體，在相同條件下，方柱的阻力更大；相反，方柱渦旋頻率較低。Re越高，串聯(lián)的氣缸的Sr值與單個(gè)氣缸的Sr值越接近。關(guān)鍵詞：圓柱繞流；升力系數(shù)；阻力系數(shù)；斯特勞哈爾數(shù)AbstractⅡAbstractⅢTitle NumericalsimulationofflowaroundacylinderofviscoelasticfluidAbstractWhenthefluidflowsthrougharelativelystaticstructureorbluntbody,thestructureorbluntbodywillbesubjectedtocontinuousandpulsatingflowforceduetofluidseparationandvortexshedding.Sothestructuremustbestrongenoughtowithstandtheimpact.Theengineeringapplicationofbluntbodyflowaroundisveryextensive,suchasaircraftwingpillar,snorkellingpipeofsubmersibleboat,highvoltagetransmissionline,coolingtowerinpowerplant,bridge,high-risebuilding,pipeinheatexchangerandsoon.However,thecommonprobleminreallifeistoreducethefluidresistanceasmuchaspossible.Therefore,foralongtime,peoplehavebeenlookingforwaystoreducefluidresistanceinareasinvolvingviscousfluidmotion,fromunderwaterobjectstoaerospacevehicles.Inthispaper,RNGK-modelinFluentsoftwarewasusedtonumericallystudytheflowaroundacylinderandasquarecylinderofviscoelasticfluidunderasubcriticalReynoldsnumber.Bycomparingtheresults,theeffectsofReynoldsnumberandcylindershapeontheflowaroundthecylinder,liftandvortexfrequencywereanalyzed.Generallyspeaking,thegreatertheRenumberis,thegreatertheresistanceofthesquarecolumnwillbe,butnotthecylinder.ThelargerReis,thelargertheliftforceofbothcylindersis.Comparedwiththecylinder,theresistanceofthesquarecolumnisgreaterunderthesamecondition.Onthecontrary,thevortexsheddingfrequencyofsquarecolumnissmaller.ThelargerReis,themoretheSrnumberofacolumninaseriesisclosetothatofasinglecylinder.Keywords:Cylinderflowaround;Liftcoefficient;Resistancecoefficient;Strouhal'snumber目錄 目錄 TOC\o"1-3"\h\u20310第1章緒論 -結(jié)論本文使用商業(yè)軟件Fluent，使用RNGk-e模型對(duì)具有亞臨界雷諾數(shù)的圓柱和方柱中粘彈性流體流動(dòng)的輪廓問題進(jìn)行了數(shù)值研究。首先，驗(yàn)證所用網(wǎng)格的獨(dú)立性，然后計(jì)算出具有不同間距的串聯(lián)氣缸的Sr數(shù)量，并將其與文獻(xiàn)中的數(shù)據(jù)進(jìn)行比較，從而驗(yàn)證該方法和應(yīng)用的準(zhǔn)確性。從程序。然后，文章分析了雷諾數(shù)和圓柱體形狀對(duì)圓柱體繞流阻力，渦旋高