Icepak Introductory Training

©2009ANSYS,Inc.Allrightsreserved.1ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.1ANSYS,Inc.ProprietaryIcepakIntroductoryTrainingTrudiShortisPrincipalCFDEngineer©2009ANSYS,Inc.Allrightsreserved.2ANSYS,Inc.ProprietaryChapter1)Overview+Gettingstarted2)Interface3)Geometricmodelling4)Physicalmodelling5)Meshing6)Non-conformalmeshing7)Problemdefinition+Solving8)ParametricsandOptimization9)Aspectsofheattransfer+physicalmodels10)Post-processingandReporting11)MCADandECADimportandexportTrainingNotes-Contents©2009ANSYS,Inc.Allrightsreserved.3ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.3ANSYS,Inc.ProprietaryOverview©2009ANSYS,Inc.Allrightsreserved.4ANSYS,Inc.ProprietaryATESSFIAavid-TaiwanFluentIndiaCFD-RESFluentEurope-Sheffield,EnglandFluentGermanyFluentSwedenFluentFranceFluentItaly+networkof11distributorsFluentInc.-Lebanon,NH-Evanston,IL-AnnArbor,MI-Morgantown,WV-SantaClara,CAFluentAsia-PacificFluentInc.missionistoprovideflowandthermalanalysissoftwareandservicesthatgiveourcustomersasignificantcompetitiveadvantagebydramaticallyimprovingtheirdesignsanddesignprocessesFluentWorld-wide©2009ANSYS,Inc.Allrightsreserved.5ANSYS,Inc.ProprietaryFLUENT6GeneralpurposefinitevolumebasedCFDpackagesuitableforincompressible/compressibleandlaminar/turbulentflows,includingreactingflowsandmultiphaseflows.FIDAPGeneralpurposefiniteelementbasedCFDpackagesuitableforincompressiblelaminar/turbulentflowsinvolvingNewtonian/Non-Newtonianfluids,freesurfacesandfluid-structureinteraction.POLYFLOWFiniteelementbasedCFDpackagesuitableformodelinghighlyviscousflows(asinrheology)andsurfaceflows.MixSimSpecializedCFDsoftwareformodelingmixingprocesses.IcepakSpecializedCFDsoftwaredesignedforthermalmanagementofelectronicpackages.AirpakSpecializedCFDsoftwaredesignedforHVAC.Fluent’sSoftware©2009ANSYS,Inc.Allrightsreserved.6ANSYS,Inc.ProprietaryWhatisCFD?•ComputationalFluidDynamics:Scienceofpredictingfluidflowandheattransfercharacteristicsofasystembyusingnumericalmethodstosolvethegoverningequations.•ImportanceofCFD:•Analysisanddesigntool•Complimentsexperimentation–Lowcost,highspeedalternativetolabsimulations.Reducesdependenceonlaboratoryexperiment,andspeedsupthedesigncycle.•Comprehensiveoutput–Measurementsinlabexperimentsarefeasibleonlyatselectpointsinthedomain.CFDcanquicklygiveflowandheattransfercharacteristicsanywhereinthedomain.©2009ANSYS,Inc.Allrightsreserved.7ANSYS,Inc.ProprietaryAimofthemodelModelbuildingMeshingNumericmodelSolveAnalyzeresultsNextstep!Aim:Thegoalofthemodelmustbeclearlydefined.Thisoftengivesdirectiontothesubsequentsteps.Someexamplesofaims:•Optimizethermalviasinsideapackagetominimizedietemperature•Boardlayoutdesigntogetthetargetpackages’dietemperatureunderaspecifiedvalue•Selectionandpositioningoffanstomaintaintherequiredflowinthetelecombox-tobecompletedinthenext6workinghours.StepsinaCFDproject©2009ANSYS,Inc.Allrightsreserved.8ANSYS,Inc.ProprietaryStep1:ModelBuilding•Theprojectaimdeterminestheextentsoftheregionofinterest,andwhatlevelofdetailisrequired.•Themodelcontains–Geometricdetailofthecomponents–Physicaldetail•Thermalproperties•Materialproperties•Boundaryconditions•Initialconditions–Importantforunsteadymodels©2009ANSYS,Inc.Allrightsreserved.9ANSYS,Inc.ProprietaryStep1:Geometricmodelling•PossiblewaysofgeometricmodelinginIcepak:•Icepakprimitives:•Objects:blocks,plates,fans,grilles,powersources,etc.•Shapes:Prism,cylinder,rectangular,polygon,etc.•Locateobjectsandspecifyshape/dimensioninIcepakGUI•OtherCADpackages:•MechanicalCADIGESformatIcepakCADimport•ElectricCADIDFformatIcepakIDFimport•SpreadsheetsIcepakCSVfileimport•ProEIcepak:Directinterface©2009ANSYS,Inc.Allrightsreserved.10ANSYS,Inc.ProprietaryStep1:Physicalmodelling•Icepak’sobjectphilosophyGovernedbythermo-fluidpropertiesoftheobject•Materials:•Defaultlibraryofengineeringmaterials•Userdefinedmaterials•Temperaturedependentmaterialproperties•Boundaryconditions:•Fixedb.c.’s•Spatiallyvaryingprofiles•Temperaturedependentb.c.’s•Transientb.c.’s,andambientconditions•Multi-fluidcapability•Genericnetworkmodelingcapability:•Madeofinternal/boundarynodesinter-connectedbyflow/thermallinks•Userdeterminesnumber/typeofnodesandnetworktopology©2009ANSYS,Inc.Allrightsreserved.11ANSYS,Inc.ProprietaryStep1:Built-inComponents•DefaultIcepaklibrarycontainsdatabankof:•Commercialfans•Filters•ICpackages•Macrosmenucontains•Packagelevelmodels:ICpackages,JEDECtestchambers,Networkpackagemodels•Thermo-electriccooler•Others:Solarfluxcalculator,Networkheatexchanger,ATXchassis•Periodicallyupdated-downloadablefromIcepakUserServiceCenteratnocharge•Compositeobjecttypes•Heatsinks•PCBs•ImpellersandBlowers•Enclosures©2009ANSYS,Inc.Allrightsreserved.12ANSYS,Inc.ProprietaryStep2:Meshingthemodel•Powerfulgridgenerator•Typeofmeshelements•Unstructuredhexagonal•Cartesianhexagonal•Tetrahedral•Flexiblemeshrefinement•Domainlevelcontrols–applicabletoallobjects•Individualobjectlevelcontrols•Recursiveembeddedmeshing•Arrestmeshbleedingduetomodelingdetails•Enableslocalizedmeshrefinement•Captureessentialdetailswithoutsacri