FLOTHERM tutorial.docx

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