欢迎来到天天文库
浏览记录
ID:39459234
大小:2.10 MB
页数:51页
时间:2019-07-03
《Hydrodynamic stability-Jan》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、HydrodynamicstabilityJanPralitsDepartmentofCivil,ArchitecturalandEnvironmentalEngineeringUniversityofGenoa,Italyjan.pralits@unige.itGiugno13-15,2012CorsodidottoratoinScienzeeTecnologieperl'Ingegneria(STI):FluidodinamicaeProcessidell'IngegneriaAmbientale(FPIA)JanPralits(UniversityofGenoa)Hydro
2、dynamicstabilityGiugno13-15,20121/51OutlineCourseoutlineTopic:Hydrodynamicstability(Linear,temporal,parallelshear ows)Hours:10Lectures:AulaA12(Ex-DISEG)Wednesday13/069-11&14-16Thursday14/069-11&14-16Friday15/069-11&11-13(Exerciseoptional)PleasebringyourlaptopforthenumericalanalysisCredits:2Co
3、ntent:1Introduction2Denitions3Inviscidanalysis4Viscousanalysis5Exercises:analytical&numericalBook:SchmidP.J.&HenningsonD.S.,StabilityandTransitioninShearFlows,SpringerJanPralits(UniversityofGenoa)HydrodynamicstabilityGiugno13-15,20122/51IntroductionHydrodynamicstabilityHydrodynamicstabilityt
4、heoryisconcernedwiththeresponsoflaminar owtoadisturbanceofsmallormoderateamplitude.The owisgenerallydenedasStable:Ifthe owreturnstoitsoriginallaminarstate.Unstable:Ifthedisturbancegrowsandcausesthelaminar owtochangeintoadierentstate.Stabilitytheorydealswiththemathematicalanalysisoftheevolut
5、ionofdisturbancessuperposedtoalaminarbase ow.Inmanycasesoneassumesthedisturbancestobesmallsothatfurthersimplicationscanbejustied.Inparticular,alinearequationgoverningtheevolutionofdisturbancesisdesirable.Asthedisturbancevelocitiesgrowaboveafew%ofthebase ow,nonlineareectsbecomeimportantandl
6、inearequationsnolongeraccuratelypredictthedisturbanceevolution.Althoughthelinearequationshavealimitedregionofvaliditytheyareimportantindetectingphysicalgrowthmechanismsandidentifyingdominantdisturbancetypes.JanPralits(UniversityofGenoa)HydrodynamicstabilityGiugno13-15,20123/51IntroductionReyn
7、oldspipe owexperiment(1883)Original1883appartusDyeintocenterofpipeCriticalRe=13:000LowertodayduetotracJanPralits(UniversityofGenoa)HydrodynamicstabilityGiugno13-15,20124/51IntroductionHistoryofshear owstabilityandtransitionReynoldspipe owexp
此文档下载收益归作者所有