槽道壁面多障碍物绕流的数值模拟

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1、AbstractLargeeddysimulations(LEs)wereperformedonachannelflowwithtworectanglecylinderlnountedonitsbotomwall.OurresultsagreeweUwithrelativeex详rimental朋dnumericalsimulation邝sults，whichvalidatethepossibilityofLEStosimu1atethe3一DcomPressiblenowpassovermultivlecylinders.B歇祀donthePractlcalb朗kg

2、旧und，theinfluencesofthecslinderheightonthechanndflo、vhavebeensimu』ated.0址。u幻nencalresultssbowedthat初th由eincre别记ofcylinderheight，thecylinderwakebecomesinstable，阳dresultsinacomPlexflowlleld，thevortexdifilslonandsePaJ旧tionincre歇记.从币entheheightofthecylinderlargethimati廿esholdva】ue，no】argevo

3、rtexoccurs.Moreover，Whenthedistane忱t叭七en七份0cy1indersissmalcomParedtotheirheigh丸thewakeoftheuPstreaJ的crlinder币nshedevnbeforeitgrowing即.Ontheother压川d，thedragcoeficientofuPstre别mCylinderispositiveand而哭squicklywiththeincreaseofitshei纵however，thedragof~ndcylinderisnegativeanditsoscinationamP

4、】而deaugnlentswiththeincreaseofitsheight.To1mProvethedragforceofsecondCylinder，itmaykePthe即stre别旧cylinderheightcons。口tandincre出记thebeightofthesecondole.Ourcalco】aledresultsdisPlaythatwiththelOcre别记ofits址ight，thedr昭coeficieni而ses目50，即dwhentheheightbecomehZ月柑6，itsaverageval加幻uctuatesataroU

5、nd一0.05，山erefore，itispossibletolinpr0vetheirdragcoeficient幼山theadjustoftheheightof朋condcylinder.hithistheiss，theinflucenesofavanationofdi劝anCebetweentwocylindors、vereaisosimula宜ednu〔。encally，andourresultsdiscl。义dthat，withasmaldis。叮ce印mParedtotheheightofthecylinderhei纵由e比isnoobviousvodex

6、sheddingattherearoftheupstreamcylinder.However，with1he1na限田姆ofthedlstance，avortexsheddingo(￡.rs，即dthev0rtexshedswhenitssizebecomc1别笔e.T五eshededvo川Lexjnteracts俪lhthedownstreamvortexes云omthe别沈ondcylinder，whichmakethenow印mPlex.从七即thedis栩盯cebecomelarge，thevortexlnteractlonbetween。刃ocylinder

7、sdecre别犯5，butthenowisstillcomPlicated.TbedmgcoeficientofuPstre田刀cylinder而seslowlywiththeincreaseof阮distan沈即dthedragcoe伍cientofthesecondcyllnderdecrea‘e‘·Keywords:Large一Ed勿一Simulation(LES)，3一Dturbulentchanelflow，rectanglecylinde毛comPressibleflow声明本学位论文是我在导师的指导下取得的研究成果，尽我所知，在本学位论