Airpak3.0-经典实例教程

Tutorial1.OfficeVentilationIntroduction:Thistutorialdemonstrateshowtomodelanofficesharedbytwopeopleworkingatcomputers,usingAirpak.Inthistutorial,youwilllearnhowto:•Openanewjob•Includeeffectsofrelativehumiditydistributioninthesimulation•Createblocks,openings,vents,partitionsandwalls•Modeltheeffectsofradiation•Changethenumberofsolveriterations•Calculateasolution•Examinecontoursandvectorsonobjectfacesandcross-sectionsofthemodel•Traceparticlestreamsfromairinlets•Examinethecomfortlevelintheroombycalculatingthepredictedmeanvote(PMV)andpredictedpercentagedissatisfied(PPD)Prerequisites:ThistutorialassumesthatyouhavelittleexperiencewithAirpak,butthatyouaregenerallyfamiliarwiththeinterface.Ifyouarenot,pleasereviewthesamplesessioninChapter1oftheUser’sGuide.ProblemDescription:Theofficeispartitionedintotwosections,eachcontainingonepersonworkingatacomputer,asshowninFigure1.1.Theofficealsoincludessixfluorescentlights,abaseboardheater,aninletdiffuser,aventilationreturn,andawindow.Surfacetemperaturesandairvelocityprofilesaresoughtinordertodeterminetheoverallcomfortoftheroomforitsoccupants.Table1.0.1:Geometrical,Thermal,andFlowBoundaryConditionsfortheDiffuserandWindowSizeTemperatureVelocityInletDiffuser0.2m×0.3m13.5◦C0.85m/sWindow3.65m×1.16m30.9◦C—–cFluentInc.May16,20071-1OfficeVentilationTable1.0.2:SizeandCapacityoftheHeatSourcesHeatSourceSizePowerBaseboardHeater1.2m×0.1m×0.2m1500WPerson0.4m×0.35m×1.1m75WComputer10.4m×0.4m×0.4m108WComputer20.4m×0.4m×0.4m173WLamp0.2m×1.2m×0.15m34WFigure1.1:GeometryoftheOfficeVentilationProblem1-2cFluentInc.May16,2007OfficeVentilationStep1:OpenandDefineaNewJob1.StartAirpak,asdescribedinSection1.5oftheUser’sGuide.WhenAirpakstarts,theNew/existingpanelwillopenautomatically.2.ClickNewintheNew/existingpaneltostartanewAirpakproject.TheNewprojectpanelwillappear.(a)SpecifyanameforyourprojectintheProjecttextbox.Youcanenterthenameoffice.(b)ClickCreate.Airpakwillcreateadefaultroomwithdimensions10m×3m×10m,anddisplaytheroominthegraphicsdisplaywindow.Youcanrotatetheroomaroundacentralpointusingtheleftmousebutton,oryoucantranslateittoanypointonthescreenusingthemiddlemousebutton.Youcanzoomintoandoutfromtheroomusingtherightmousebutton.Torestoretheroomtoitsdefaultorientation,clickontheOrientmenuandselectHomeposition.3.Modifytheoverallproblemdefinitiontoincludetheeffectsofchemicalspeciesmixingandturnontheidealgaslas.Problemsetup−→BasicparameterscFluentInc.May16,20071-3OfficeVentilation(a)IntheBasicparameterspanel,selectOnnexttoSpeciesandclickEdit.AirpakwillopentheSpeciesdefinitionspanel.i.SelecttheInitialconcentrationofh2oto50.ii.SelectRHfromthemenutotherightoftheInitialconcentrationfieldforh2o.RHistherelativehumidityoftheairintheroomspecifiedasapercentage.iii.ClickAccept(b)IntheBasicparameterspanel,clicktheAdvancedtab.i.TurnontheIdealgaslawoptionandtheOperatingdensityoperationandkeepthedefaultvaluesfortheoperatingpressureanddensity.ii.ClickAccept1-4cFluentInc.May16,2007OfficeVentilation(c)KeepthedefaultsettingsforallotherparametersintheBasicparameterspanel.(d)ClickAccepttosavethenewsettings.cFluentInc.May16,20071-5OfficeVentilationStep2:BuildtheModelTobuildthemodel,youwillfirstresizetheroomtoitspropersize.Thenyouwillcreatethefeaturesoftheroom,includingpeople(2),computers(2),lights(6),tables(2),aventilationreturnandinputdiffuser,aradiator,apartition,andwalls.1.Resizethedefaultroom.Model−→Room(a)IntheRoompanel,enterthecoordinatesasshowninthefollowingfigure.(b)ClickDonetoresizetheroom.(c)ClickfromtheOrienttoolbartoshowanisometricviewoftheroomscaledtofitthegraphicswindow.Note:Thewallsoftheroomareadiabaticanddonotparticipateinradiation,bydefault.Toincluderadiationeffectsattheboundariesoftheroom,youwilldefinewallobjectsattheboundarieslaterinthisstep.2.Createthefirstpersonintheworkspace.1-6cFluentInc.May16,2007OfficeVentilationNote:ThereisaPersonobjectinAirpak;however,forthissimulation,therepre-sentationofthepeoplewillbesimplified,i.e.,thepeoplewillberepresentedbyhollowblocksthatareenergysources.Tutorials2and3willmakeuseofthePersonobject.(a)Clickintheobjecttoolbar.Airpakwillcreateanewhollowprismblockinthecenteroftheroom.Youwillneedtochangeboththesizeoftheblockanditslocationwithintheroom.(b)DisplaytheBlockseditpanelbydoingoneofthefollowing:•Doubleclickblock.1intheModelmanagerwindow.•Selectblock.1intheModelmanagerwindowandrightmouseclicktodisplaythecontextmenu.SelectEditobject.(c)EnterthefollowingcoordinatesforthefirstpersonintheGeometrytab:xS1.4xE1.8yS0yE1.1zS-0.6zE-0.95(d)InthePropertiestab,settheTotalpowerunderThermalspecificationtobe75W.(e)IntheInfotab,enterthenameperson1intheNamefield.(f)ClickUpdatetomodifytheblock.ClickDonetoclosethepanel.3.Createthesecondperson.(a)Clickintheobjecttoolbar.(b)Doubleclickblock.1intheModelmanagerwindowtodisplaytheBlockseditpanel.(c)IntheGeometrytab,enterthefollowingcoordinatesforthesecondperson:xS3.6xE4.0yS0yE1.1zS-3.05zE-3.40(d)InthePropertiestab,settheTotalpowerunderThermalSpecificationtobe75W.(e)IntheInfotab,enterthenameperson2intheNamefield.(f)ClickDonetoupdatetheblockandclosethepanel.4.Createthefirstcomputer.Thecom