流场模拟和流固耦合问题的网格新方法

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1、上海交通大学硕士学位论文流场模拟和流固耦合问题的网格新方法姓名：李磊申请学位级别：硕士专业：结构工程指导教师：周岱20090101NOVELMETHODSFORMESHTECHNOLOGYINFLOWFIELDSIMULATIONANDFLUID-SOLIDINTERACTIONSTUDYABSTRACTFlowfieldsimulationisanessentialpremiseoftheflowmovementstudywiththeComputationalFluidDynamics(CFD).Fl

2、uid-SolidInteraction(FSI)isaninterdisciplinebranchofHydromechanicsandSolidmechanics.Asanimportantwaytostudytheinteractionbetweentheflowdomainandsoliddomain,NumericalsimulationofFluid-SolidInteractionisdrawingmoreandmoreattentionnow.Meshtechnologyisoneofth

3、ekeyproblemsinflowfieldsimulationandthefluid-solidinteractionsolution.Meshquality,adaptabilityandcomputationalefficiencyareveryimportantfactorsinsuccessfullyconstitutingandsolvingtheFSImodeling.Somekeyproblemsofmeshtechnologyinnumericalsimulationoffluid-s

4、olidinteractionwereresearchedinthisdissertation.Withalargenumberofdocumentsandmaterials,acomprehensivesummarizeaboutmeshgeneration,updatetechnologywaspresented.Then,basedonthefamilyofmappingfunctions,structuredmeshsystemfor2D/3Dflowfieldwasgenerated.Inord

5、ertoadapttothechangesoffieldfunctiondensityinthepracticalstudies,theinterpolationformulawhichcancontrolthemeshdensitywasderived,andthenthemeshmodelingfortheairflowfieldbytheseformulawasconstitutedtoverifytheeffectivenessofthepresentinterpolationformula.Mo

6、reover,anewtechniquewasproposedtoimprovethequalityofmeshmodelinginbothcirculardomainandcylindricaldomainbyintroducingtheembeddedblock,andtheminimumangledistributionofthemeshsystembasedonthepresenttechniquewasstatisticallyanalyzedandsomecomparisonwiththere

7、sultbyothermethodwasmade,inordertoverifytheimprovement.Withtheprogrambasedonthepresentmethod,theflowfieldsoftwospacestructuresweremeshed.Itisconfirmedthatthismethodhasagoodadaptiontothestructureswithcomplicatedshapesandthecalculationwiththemeshsystemgener

8、atedbythemethodisvalid.Thoughthecomparisonbetweendifferentmeshmodels,itwasindicatedthattheuseofvariabledensitymeshmodelcangreatlyimprovetheefficiencyofmeshgenerationandtheiterativecalculationwithahigh-precisionsimul