串列方柱渦致振動的數(shù)值模擬.pdf

1、同濟大學(xué)理學(xué)院數(shù)學(xué)系碩士學(xué)位論文串列方柱渦致振動的數(shù)值模擬姓名：趙世海申請學(xué)位級別：碩士專業(yè)：計算數(shù)學(xué)指導(dǎo)教師：陳素琴20090301英文摘要AbstractDuetoitsspecialshape，squarecylinderhasunsteadyvortexsheddinginitswakeflowwhichinspiresvortex—inducedvibrationItisatypicalaerodynamicsphenomen

2、onofflowaroundbluffbodyNumericalsimulationisgiventounsteadyflowarounda2DsquarecylinderwithtwoRANSturbulencemodelsseparatelyTherangeofReynoldsnumberisbetween3000and9000Theresultsalealmostthesameasthosefromexperimentsandot

3、hernumericalattemptsAstothecaseofvortexinducedvibration，afluidstructureinteractionsoftplatform(FSI)WasappliedItisbasedonlooselycouplingpartitionedmethodwhichhasbeendevelopedintheenvironmentofCompaqVisualFortran65Theprogr

4、amhasthecharacteristicsofmodularization，inwhichCFDmodule，CSDmoduleandthemeshinterpolationmodulekeepindependenteach，andallofthemareintegratedintotheprogramasthesubroutinesonbackgroundDuringtheprocess，thevelocityofthewindi

5、ncreases，whilethedisplacementofthesquarecylin—derchanges，whichcoincideswithwhathappenedintheexperimentVortexinducedresonanceandlockinphenomenonarealsocapturedAmorecomplicatedcaseofunsteadyflowaroundtWOfixedsquarecylinder

6、sintandemarrangementsisstudiedwithseveraltandemdistancesTheresultsprovethatthereisessentiallydifferenceinliftcoefficientsofthedownstreamcylinderbetweenthecasewhenthetandemdistanceislargerthanthecriticaldistanceandthecase

7、whenthetandemdistanceissmallerthanthecriticaldistanceNumericalsimulationisconducted011vortex—inducedvibrationofasquarecylinderwithinterferenceThesimulationindicatesthatasasingle—degreeoffreedomsystem，thesquarecylinder’Sd

8、isplacementalterswithdifferenttandemdistancesThedisplacedistancefigureiscoincidentwiththeresultsacquiredinGowda’SexperimentKeyWords：aerodynamic，vortex—inducedvibration，fluid—structureinteraction，lockinphenomenon，Strouhal