Lecture 1 - Introduction ――FloEFD的培训教程(三天)李中云

.BasicIntroductiontoEFDforElectronicsCoolingCalculationsTrainingCourse3-DayVersionVersion0.91©FlomericsLtd.&NIKAGmbH20081.Day1BasicIntroduction•WhatisEFD?–7KeyTechnologies•Introduction–Wizard–Grid–Boundaryconditions–Goals–Solving–Postprocessing•Practice:Tutorial2•WorkingwithProjects–Cloning–Templates–ParameterEditor•ClosingtheDaywithExperiments–Tutorial2–Internal-externalflow–Modifications:gridding,b.c.,goals–Modifications:geometricparameters2.3•ElectronicsCooling–Modellingadvice–EL-Module–Otherissues•ImportingCADGeometry–Remarks–Necessaryactions–Geometrychecks–Do‘sandDont‘s•WorkshopwithUser-ProvidedModels•ComputationalDomainandCalculation–FluidSubdomain–BatchMode–SolutionControl•Postprocessing–MoreFeatures•Meshing–InitialandLocalMesh–RecommendationsDay2AdvancedInformation.4•ModellingwithEFD.lab(optional)–NewPart–Sketches–Mates–Assembly–Geometryrepair–Ownlibrary•TroubleshootingDay3Workshop.5Lecture1Introduction.6WhatisEFD?•EngineeringFluidDynamics(EFD)•Theadvancedandsophisticatedapproachforfluidflowandheattransferanalysissoftware.•EFD.Lab:Generalpurposefluidflowandheattransferanalysissoftware•EFD.Pro:FullyintegratedversionofEFDrunninginsidePro/ENGINEER•EFD.V5:FullyintegratedversionofEFDrunninginsideCATIAV5.7TheSevenEFD-KeyTechnologiesDC3–DirectCAD-to-CFDConceptionRAM–RectangularAdaptiveMeshMWF–ModifiedWallFunctionsLTTM–Laminar-Transitional-TurbulentModelingACC–AutomaticConvergenceControlDVA–DesignVariantsAnalysisEUI–EngineeringUserInterface.81.DirectCADtoCFDFoundation–DirectuseofMCADgeometry–Automaticdetectionoffluidregion.92.RectangularAdaptiveMeshing–Automaticmeshingforfluidandsolidregions‣includingautomaticmeshrefinement/unrefinementduetogeometricaland/orphysical(solutionadaptive)requirements–Fullaccesstomeshcontrols.103.ModifiedWallFunction–Grid-independentnear-wallmodelingusingPartialCellstechnology–Physicallycorrectsimulationofboundarylayerphenomenaforfluidflowandheattransfer.114.Laminar–Transitional–TurbulentModelling–Automaticlaminarturbulentmodelingwithuniversal,gridindependentModifiedWallFunctions–Laminar,transitional,andturbulentflowregimesinonemodel--noneedtospecifyflowcharacteristics.125.AutomaticConvergenceControl–Veryrobustconvergencebehavior–Firstrunconvergeswithoutadditionalnumericaldiffusion.136.DesignVariantAnalysis–Cloningfeaturefor“what-if?”analysiswithoutfurtherdefinitionofmodeldata–Fullsupportofproductconfigurationconcepts.147.EngineeringUserInterface–Easy-to-usegraphicaluserinterface–Speaksthelanguageoftheengineer--veryeasytolearn–Comprehensiveresultanalysisandvisualizationcapabilities–MSOfficebasedresultpresentation.15AnalysisTypes•Internalflowsareconfinedinsidethegeometrysuchasflowsinsidepipes,tanks,buildings,etc.•Externalflowsoccuroveroraroundamodelsuchasflowsoveraircraft,automobiles,buildings,etc..•Conductionthroughasolidorastationaryfluid•Materialsk=f(T)HeatFlowT1T2T1T2Q=kA(DT/Dx)HeatTransfer16.MovingFluidT2SurfaceT1HeatFlowT1T2Q=hADTHeatTransfer•Convectionfromasurfacetoamovingfluid17.•Radiationexchangebetweentwosurfaces•Greybodyapproximationforinfraredradiation•Non-absorbingmedium•Automaticcalculationofviewfactors•Far-fieldsolarradiationSurfaceT1SurfaceT2Q=sAT4HeatTransfer18.19Steady-state&TransientAnalysis•Thetime-dependentformofthegoverningequationsaresolved•Forsteadyflowproblemsthesolveriteratesuntilthereisnochangeinvariables•Fortransient(time-dependent)flowsthesolveriteratesfromtheinitialconditionswhichmustbepreciseandconsistent.20Turbulence•Turbulenceisnormallyfoundinthebulkoftheflowfieldandalsointheboundarylayersnearwalls.•IfyouhavenotspecifiedLaminarOnlyorTurbulentOnlyflow,theflowcanbeeitherlaminarorturbulentorwithtransitionfromonetypetoanother(dependingontheflowcharacteristics)..21GravitationalEffects•Includebuoyancyfornaturalconvectionproblems.TVXVY.22Andmanymorecapabilities…..–External&internalflows–Steady-stateandtransientanalysis–Compressiblegas,liquid&incompressiblefluid–Free,forced,andmixedconvection–Boundarylayers,includingwallroughnesseffects–Laminar&turbulentflows–Multi-speciesfluids&multi-componentsolids–Heattransferinfluid,solid&porousmedia–Isotropic,unidirectional,biaxial/axisymmetricalandorthotropicthermalconductivities–Non-Newtonianliquids–Realgases–Two-phaseflow(fluid&particles)–Relativehumidity–Moving/rotatingsurfacesand/orparts–Cavitationinincompressiblewaterflows–Linearperiodicboundaryconditions–Equilibriumvolumecondensationofwaterfromsteamanditsinfluenceonfluidflowandheattransfer.23•Automotive•Aerospace•Electronics•Machines•Food•Oil&Gas•Energy•HVAC•Valves&Regulators•Environment•Medical•ElectronicsCooling…andmuchmore!EFDintheIndustry