FLOTHERM tutorial.docx
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FLOTHERM tutorial.docx
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FLOTHERMtutorial
FLOTHERM(5.1)
WhatisFLOTHERM?
FLOTHERMisapowerful3Dcomputationalfluiddynamicssoftwarethatpredictsairflowandheattransferinandaroundelectronicequipment,includingthecoupledeffectsofconduction,convectionandradiation.
FLOTHERMispowerful3Dsimulationsoftwareforthermaldesignofelectroniccomponentsandsystems.Itenablesengineerstocreatevirtualmodelsofelectronicequipment,performthermalanalysisandtestdesignmodificationsquicklyandeasilyintheearlystagesofthedesignprocesswellbeforeanyphysicalprototypesarebuilt.FLOTHERMusesadvancedCFD(computationalfluiddynamics)techniquestopredictairflow,temperatureandheattransferincomponents,boardsandcompletesystems.
Unlikeotherthermalsimulationsoftware,FLOTHERMisaDesign-Classorindustry-specificanalysistoolspeciallydesignedforawiderangeofelectronicapplicationsthatinclude:
∙computersanddataprocessing,
∙telecommunicationsequipmentandnetworksystems
∙semiconductordevices,ICsandcomponents
∙aerospaceanddefensesystems
∙automotiveandtransportationsystems
∙consumerelectronics
AsaDesign-Classtool,FLOTHERMfeaturesspecialization,built-inintelligenceandautomationnotfoundintraditionalanalysissoftware.Thisfunctionalitymaximizesproductivityforthermaldesignexperts,minimizesthelearningcurveformechanicaldesignengineersandprovidesthehighestlevelsofreturnoninvestmentavailablefromanalysissoftware.
Inasmalltomedium-sizedcompany,FLOTHERMcanpayforitselfseveraltimesoverinjustoneyearandevenfasterasthesizeofthecompanyincreases.ExperiencethebenefitsofusingFLOTHERMforthermaldesignofelectronics,thatinclude:
∙solvingthermalproblemsbeforehardwareisbuilt
∙reducingdesignre-spinsandproductunitcosts
∙improvingreliabilityandoverallengineeringdesign
HowtoRunFLOTHERM?
FLOTHERMisnormallyruninteractively,soproblemsetup,flowcalculationandresultsanalysiscanbecompletedinthesameprogramsession.
ToStartanInteractiveSession
OnNT/Windows2000/XPPlatforms
IntheFlotherm51groupusethefollowingmenusequence:
Start->Programs->Flomerics->FLOTHERM->FLOTHERM 5.1
ExitingFLOTHERM:
ToexitfromFLOTHERM,intheProjectManagerchooseExitfromtheProjectmenu.
FLOTHERMthenchecksforprojectchangesbeforeexitingtheprogram.
Ifchangesaredetected,youaregiventhechancetosavethemusingaquerydialog.Therearethreeoptions:
a.[Yes]savestheprojectandsolutiondatabeforeexiting.
Ifsavinganewproject,theSaveProjectDialog,appearssoyoucangiveitaname,titleandclass.Anexistingprojectisoverwritten.
b.[No]doesnotsavetheprojectbeforeexiting.
c.[Cancel]cancelstheexitrequest.
GettingStarted:
-
1.CreatingaNewProject:
-
∙CreateanewprojectusingtheDefaultSItemplate.
∙NametheNewProject:
ChooseSaveAs...fromtheProjectmenu.
Name=Basics
Title=FundamentalsofFLOTHERM
∙AddReminders:
Clickon[Notes]tocallthenotepadeditordialog.UsingtheEditNotesdialogyoucanaddnotestoaccompanytheproject.Forexampleachangelogcouldbeincludedtoidentifythemodelingprocessfollowed.
Forthepurposesofthisexercisejusttype"LearningthefundamentalsofFLOTHERM"andappendthedatetothetextbyclickingon[Date]andclick[OK]intheEditNotesdialog.
2.HowtoSettheSizeoftheSolutionDomain:
-
∙DisplaytheSystemMenu:
MovethemouseovertheSystemnodeandright-clicktodisplaytheSystemmenu.
∙OpentheOverallSolutionDomaindialog:
ChooseLocation...fromtheSystemmenu.
∙SetSizeofSolutionDomain:
LeavethePositionsettingsatzero,butdefinetheSizeas:
X=0.07m,Y=0.40m,Z=0.30m.
3.CreatingaLargePlate:
-
∙CreatetheGeometry
Representalargeplateintheprojectbyaddingacuboidmadeofmildsteel.
∙OpentheNewObjectPalette
∙ClickontheRootAssemblytoselectitandclickthepaletteicon
atthetopoftheProjectManagertoopentheNewObject
∙AddaCuboid
IntheNewObjectPalette,selectacuboid
.
Anewcuboidisaddedtothedatatree.
Thisnewcuboidis10%thesizeofthesolutiondomain.
∙CalltheEditPrimitiveDialogtochangetheCuboidDefaults:
Right-clickthenewcuboidandchooseLocation...fromthepop-upmenutocalltheEditPrimitiveDialog.
∙DefinetheLargePlate:
IntheEditPrimitivedialog,change
NametoLargePlate
andsetpositionto:
X=0.03m,Y=0.10mandZ=0.10m
andsetsizeto:
X=0.005m,Y=0.1m0,Z=0.15m
Click[Apply]toconfirmthesettings.
Notethatthenumbersenteredareconvertedtoscientificnotation,however,theycanbeenteredinanyformat.Click[OK]todismissthedialogandthecuboidcanbeseenrenamedinthetree.
∙AttachaMaterialusingtheLibrary:
OpentheLibraryManagerOpentheLibraryManagerbyeitherclickingagainonthe
palettebutton,orthe
LibraryManagerbutton
∙AccesstheAlloyMaterials:
ExpandtheLibrariesnodedownto:
Libraries->Flomerics_Libraries->Materials->Alloys
∙AttachAttribute:
Leftclick-dragSteel(Mild)ontotheLargePlate.
4.HowtoCreateaHeatedBlock:
AddacuboidwithanattachedAluminaceramicpropertytorepresentaheatedblock.
∙CreatetheGeometry.
∙AddaCuboid.SelecttheRootAssemblyandaddanothercuboid.
∙OpenEditPrimitivedialog.Right-clickthenewcuboidandchooseLocation...fromthepop-upmenu.
∙ChangetheCuboidDefinition.
MakethefollowingsettingsintheEditPrimitivedialog:
RenametheobjecttoHeatedBlock
SetPositionto:
X=0.035m,Y=0.12m,Z=0.14mSetSizeto:
X=0.005m,Y=0.04m,Z=0.04mandclick[OK].
∙AttachaPropertyusingtheLibrary.
∙AttachaMaterialPropertytotheHeatedBlock
ExpandtheLibrariesnodedownto:
Libraries->Flomerics_Libraries->Materials->Ceramics
Leftclick-dragAlumina(Typical)ontotheHeatedBlock.
∙
∙ClosetheLibraryManager:
∙Closethelibrarybyclickingonthe
doublearrow,the
paletteiconortheF7functionkey.
∙AttachaThermalAttributeusingtheDialogs:
Becausethethermalattributenowrequiredisnotinthelibrary,nowcreateanewattribute.
∙CalltheThermalSelectionDialog:
Right-clicktheHeatedBlockcuboid
andchooseThermalfromthepop-upmenu
tocalltheThermalselectiondialog.
∙CreateaNewThermalAttribute:
Click[New...]intheThermalDialogtodisplay
theThermalAttribute.
Nowmakethefollowingsettings:
Name=BlockHeat
ThermalModelkeptasConduction
TotalPower=8W
Click[OK]toreturntotheThermalselectiondialog.
∙AttachtheNewThermal:
WithBlockHeathighlightedintheThermallist,clickon[Attach].
NotethattheCurrentlyAttachedfieldupdateswhentheattributeissuccessfullyattached.
[Dismiss]thedialog.
∙SavetheProject:
ChooseSavefromtheProjectmenuorclickthe
savebutton.
Note:
Duringmodelsetupitisaverygoodideatosavetheprojectatregularintervals.
5.HowtoSettheGrid:
-
TheDrawingBoardcanbeusedtoviewthegridaswellasthegeometrystructure.
∙DisplaytheDrawingBoard
Clickthe
buttonintheProjectManagertolaunchtheDrawingBoard.
IntheDrawingBoardwecanseethetwoblockswehavejustcreatedin2Dor3Dviews.
∙DisplaytheGrid
Pressgonthekeyboardtodisplaythegrid.
Notethat,atpresent,thegridiscreatedbythegeometryboundariesalone(i.e.thekeypointgrid).Thiswillnotbesufficienttoachieveasolution,somoregridmustbeadded.
∙AddingGrid:
∙DisplaytheSystemGridDialog
Thereareanumberofmethodsavailable,butherewewilluseapre-setsystemgrid.IntheDrawingBoard,chooseSystemGrid...fromtheGridmenutodisplaytheSystemGriddialog.
∙AddaFineGrid
IntheSystemGriddialogactivatetheDynamicUpdateandclickon[Fine].ThegriddisplayintheDrawingBoardupdates.
Theprogramdefinespositionsfortheminimumandmaximumcellsizesusingasmoothingalgorithm.
6.SolvingtheProject:
-
∙Thesolverrequireslessthan35iterationsforthesolutiontoconverge.
∙StarttheSolution
∙Click
ineithertheDrawingBoardorProjectManagertostartthesolution.Asanitycheckisperformedfirstandthemessagewindowappearsindicatinganopenexternalboundarydoesnothaveanambientattached.
Fornow,ignorethissincethedefaultambient(setintheGlobalSystemSettingsdialog)willbesufficientforourpurposes.
∙Afterthesanitycheckhasbeenperformed,thesolutioncontinuesandtheProfileswindowopensandtheprogressbardisplayed.
∙Thesolutioncompletestoshowaconvergedplot.
7.VisualizingtheResults:
-
FLOMOTIONcanbeusedtodisplayplotsofresultssuperimposedoverthemodel.
∙DisplayFLOMOTION
Click
tolaunchFLOMOTION.
A2Dviewofthegeometryisshown.
∙
Changetoa3DView:
Press"i"inthekeyboardtochangetoa3Disometricview.
∙AddaPlanePlot
InthePlanePlotPanel,changethedirectiontoZ.
andclickthe
CreatePlanebutton
∙Atemperaturecontourfillplotisdisplayed.
∙ChangeGeometrytoWireframe
∙
Press"w"inthekeyboardtomakethe
geometrywireframe.
∙Thegeometrybecomestransparentallowing
thehiddenresultstobeseen.Warning:
undersomeconditions,the
resultswillalsobecomewireframe,soyoucan’tseethem.
8.TabulatingtheResults:
-
Inadditiontoviewingagraphicalrepresentationoftheresults,wecanlookattabulationsofdatausingtheTableswindow.Forexample,wecaninvestigatetheamountofheatconductedfromtheheatedblock,or,theamountofheatco
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