封閉腔內(nèi)高瑞利數(shù)（Ra）層流與湍流自然對流數(shù)值模擬.pdf

1、華中科技大學(xué)碩士學(xué)位論文封閉腔內(nèi)高瑞利數(shù)（Ra）層流與湍流自然對流數(shù)值模擬姓名：馬洪林申請學(xué)位級別：碩士專業(yè)：流體力學(xué)指導(dǎo)教師：李光正20040401AbstractTheproblemofnaturalconvectionflowheattransferinacavityhasextensiveapplicativebackgroundinapplicationengineeringsuchasheatshieldofbuilding

2、safedesignofnuclearreactmicroelectronicdevicecoolingetcsoitisnoticedmemewidely.AlotofhereoverseasscholarsdomuchwkinexperimentstudynumericalsimulationInthispaperThemethodfsolvingtheunsteadyequationsofstreamfunctionvticity

3、hasbeenusedtothecaseofnonunifmgridanalysisThecalculationsisstable.DetailedcomputationisconductedfthiscasesathighRayleighnumbers(8610~10=Ra)theirstreamlinesisothermsarepresented.Withthecomputationresultstherelationbetween

4、aveNugridnumbergriddensityhasbeengiven.ComparisonwiththepaperofthepastunderthehighRayleighnumbertheastringencytheaccuracyofthecomputationresultsarecloselyrelatedwithgridnumbergriddensityrelaxationfacttimestepwidthBecause

5、therestrictofinsidesavestheprecisionofcomputerunderthesituationof810=Raalongwithincreasingofthegridnumberthecomputationresultsdeviatesthetruevalueonthecontrary.IndertocalculatethehigherRayleighnumbertheturbulencemodelmus

6、tbejoinedInthispaperwiththeε?kmodel.usetheturbulenceviscositycoefficientmethodtostudytwodimensionalturbulentboundarylayerbynumericalsimulationWiththecomputationresultsthecurveofkutνnearbyboundarylayeraregivenmatchwiththe