流固耦合计算实例文档格式.docx
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流固耦合计算实例文档格式.docx
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Unlessyouplanonrunningasessionfile,youshouldcopythesamplefilesusedinthistutorialfromtheinstallationfolderforyoursoftware(<
CFXROOT>
/examples/)toyourworkingdirectory.Thispreventsyoufromoverwritingsourcefilesprovidedwithyourinstallation.Ifyouplantouseasessionfile,pleaserefertoPlayingaSessionFile.
Samplefilesreferencedbythistutorialinclude:
∙OscillatingPlate.pre
∙OscillatingPlate.agdb
∙OscillatingPlate.gtm
∙OscillatingPlate.inp
1.Features
ThistutorialaddressesthefollowingfeaturesofANSYSCFX.
Component
Feature
Details
ANSYSCFX-Pre
UserMode
GeneralMode
SimulationType
Transient
ANSYSMulti-field
FluidType
GeneralFluid
DomainType
SingleDomain
TurbulenceModel
Laminar
HeatTransfer
None
OutputControl
MonitorPoints
TransientResultsFile
BoundaryDetails
Wall:
MeshMotion=ANSYSMultiField
NoSlip
Adiabatic
Timestep
ANSYSCFX-Post
Plots
Animation
Contour
Vector
Inthistutorialyouwilllearnabout:
∙Movingmesh
∙Fluid-solidinteraction(includingmodelingsoliddeformationusingANSYS)
∙RunninganANSYSMulti-field(MFX)simulation
∙Post-processingtworesultsfilessimultaneously.
2.OverviewoftheProblemtoSolve
Thistutorialusesasimpleoscillatingplateexampletodemonstratehowtosetupandrunasimulationinvolvingtwo-wayFluid-StructureInteraction,wherethefluidphysicsissolvedinANSYSCFXandthesolidphysicsissolvedintheFEApackageANSYS.Couplingbetweenthetwosolversisrequiredthroughoutthesolutiontomodeltheinteractionbetweenfluidandsolidastimeprogresses,andtheframeworkforthecouplingisprovidedbytheANSYSMulti-fieldsolver,usingtheMFXsetup.
Thegeometryconsistsofa2Dclosedcavity.Athinplateisanchoredtothebottomofthecavityasshownbelow:
Aninitialpressureof100Paisappliedtoonesideofthethinplatefor0.5secondsinordertodistortit.Oncethispressureisreleased,theplateoscillatesbackwardsandforwardsasitattemptstoregainitsequilibrium(vertical)position.Thesurroundingfluiddampstheoscillations,whichthereforehaveanamplitudethatdecreasesintime.TheCFXSolvercalculateshowthefluidrespondstothemotionoftheplate,andtheANSYSSolvercalculateshowtheplatedeformsasaresultofboththeinitialappliedpressureandthepressureresultingfromthepresenceofthefluid.Couplingbetweenthetwosolversisrequiredsincethesoliddeformationaffectsthefluidsolution,andthefluidsolutionaffectsthesoliddeformation.
ThetutorialdescribesthesetupandexecutionofthecalculationincludingthesetupofthesolidphysicsinSimulation(withinANSYSWorkbench)andthesetupofthefluidphysicsandANSYSMulti-fieldsettingsinANSYSCFX-Pre.IfyoudonothaveANSYSWorkbench,thenyoucanusetheprovidedANSYSinputfiletoavoidtheneedforSimulation.
3.SettinguptheSolidPhysicsinSimulation(ANSYSWorkbench)
Thissectiondescribesthestep-by-stepdefinitionofthesolidphysicsinSimulationwithinANSYSWorkbenchthatwillresultinthecreationofanANSYSinputfileOscillatingPlate.inp.Ifyouprefer,youcaninsteadusetheprovidedOscillatingPlate.inpfileandcontinuefromSettinguptheFluidPhysicsandANSYSMulti-fieldSettingsinANSYSCFX-Pre.
CreatingaNewSimulation
1.Ifrequired,launchANSYSWorkbench.
2.ClickEmptyProject.TheProjectpageappearsdisplayinganunsavedproject.
3.SelectFile>
SaveorclickSavebutton.
4.Ifrequired,setthepathlocationtoadifferentfolder.Thedefaultlocationisyourworkingdirectory.However,ifyouhaveaspecificfolderthatyouwanttousetostorefilescreatedduringthistutorial,changethepath.
5.UnderFilename,typeOscillatingPlate.
6.ClickSave.
7.UnderLinktoGeometryFileonthelefthandtaskbarclickBrowse.SelecttheprovidedfileOscillatingPlate.agdbandclickOpen.
8.MakesurethatOscillatingPlate.agdbishighlightedandclickNewsimulationfromtheleft-handtaskbar.
CreatingtheSolidMaterial
1.WhenSimulationopens,expandGeometryintheprojecttreeatthelefthandsideoftheSimulationwindow.
2.SelectSolid,andintheDetailsviewbelow,selectMaterial.
3.UsethearrowthatappearsnexttothematerialnameStructuralSteeltoselectNewMaterial.
4.WhentheEngineeringDatawindowopens,right-clickNewMaterialfromthetreeviewandrenameittoPlate.
5.Enter2.5e06forYoung'
sModulus,0.35forPoisson'
sRatioand2550forDensity.
Notethattheotherpropertiesarenotusedforthissimulation,andthattheunitsforthesevaluesareimpliedbytheglobalunitsinSimulation.
6.ClicktheSimulationtabnearthetopoftheWorkbenchwindowtoreturntothesimulation.
BasicAnalysisSettings
TheANSYSMulti-fieldsimulationisatransientmechanicalanalysis,withatimestepof0.1sandatimedurationof5s.
1.SelectNewAnalysis>
FlexibleDynamicfromthetoolbar.
2.SelectAnalysisSettingsfromthetreeviewandintheDetailsviewbelow,setAutoTimeSteppingtoOff.
3.SetTimeStepto0.1.
4.UnderTabularDataatthebottomrightofthewindow,setEndTimeto5.0fortheSteps=1setting.
InsertingLoads
LoadsareappliedtoanFEAanalysisastheequivalentofboundaryconditionsinANSYSCFX.Inthissection,youwillsetafixedsupport,afluid-solidinterface,andapressureload.
FixedSupport
Thefixedsupportisrequiredtoholdthebottomofthethinplateinplace.
1.Right-clickFlexibleDynamicinthetreeandselectInsert>
FixedSupportfromtheshortcutmenu.
2.RotatethegeometryusingtheRotate
buttonsothatthebottom(low-y)faceofthesolidisvisible,thenselectFace
andclickthelow-yface.
Thatfaceshouldbehighlightedtoindicateselection.
3.EnsureFixedSupportisselectedintheOutlineview,then,intheDetailsview,selectGeometryandclick1FacetomaketheApplybuttonappear(ifnecessary).ClickApplytosetthefixedsupport.
Fluid-SolidInterface
ItisnecessarytodefinetheregioninthesolidthatdefinestheinterfacebetweenthefluidinCFXandthesolidinANSYS.Dataisexchangedacrossthisinterfaceduringtheexecutionofthesimulation.
FluidSolidInterfacefromtheshortcutmenu.
2.Usingthesameface-selectionproceduredescribedearlier,selectthethreefacesofthegeometrythatformtheinterfacebetweenthesolidandthefluid(low-x,high-yandhigh-xfaces)byholdingdown<
Ctrl>
toselectmultiplefaces.Notethatthisloadisautomaticallygivenaninterfacenumberof1.
PressureLoad
Thepressureloadprovidestheinitialadditionalpressureof100[Pa]forthefirst0.5secondsofthesimulation.Itisdefinedusingastepfunction.
Pressurefromtheshortcutmenu.
2.Selectthelow-xfaceforGeometry.
3.IntheDetailsview,selectMagnitude,andusingthearrowthatappears,selectTabular(Time).
4.UnderTabularData,setapressureof100inthetablerowcorrespondingtoatimeof0.
Note:
Theunitsfortimeandpressureinthistablearetheglobalunitsof[s]and[Pa],respectively.
5.Younowneedtoaddtwonewrowstothetable.Thiscanbedonebytypingthenewtimeandpressuredataintotheemptyrowatthebottomofthetable,andSimulationwillautomaticallyre-orderthetableinorderoftimevalue.Enterapressureof100foratimevalueof0.499,andapressureof0foratimevalueof0.5.
Thisgivesastepfunctionforpressurethatcanbeseeninthecharttotheleftofthetable.
WritingtheANSYSInputFile
TheSimulationsettingsarenowcomplete.AnANSYSMulti-fieldruncannotbelaunchedfromwithinSimulation,sotheSolvebuttonscannotbeusedtoobtainasolution.
1.Instead,highlightSolutioninthetree,selectTools>
WriteANSYSInputFileandchoosetowritethesolutionsetuptothefileOscillatingPlate.inp.
2.Themeshisautomaticallygeneratedaspartofthisprocess.Ifyouwanttoexamineit,selectMeshfromthetree.
3.SavetheSimulationdatabase,usethetabnearthetopoftheWorkbenchwindowtoreturntotheOscillatingPlate[Project]tab,andsavetheprojectitself.
4.SettinguptheFluidPhysicsandANSYSMulti-fieldSettingsinANSYSCFX-Pre
Thissectiondescribesthestep-by-stepdefinitionoftheflowphysicsandANSYSMulti-fieldsettingsinANSYSCFX-Pre.
PlayingaSessionFile
IfyouwanttoskippasttheseinstructionsandtohaveANSYSCFX-Presetupthesimulationautomatically,youcanselectSession>
PlayTutorialfromthemenuinANSYSCFX-Pre,thenrunthesessionfile:
OscillatingPlate.pre.AfteryouhaveplayedthesessionfileasdescribedinearliertutorialsunderPlayingtheSessionFileandStartingANSYSCFX-SolverManager,proceedtoObtainingaSolutionusingANSYSCFX-SolverManager.
CreatingaNewSimulation
1.StartANSYSCFX-Pre.
2.SelectFile>
NewSimulation.
3.SelectGeneralandclickOK.
4.SelectFile>
SaveSimulationAs.
6.Click
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