ansysworkbench流固耦合计算实例.docx

ansysworkbench流固耦合计算实例.docx

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ansysworkbench流固耦合计算实例

OscillatingPlatewithTwo-WayFluid-StructureInteraction

Introduction

Thistutorialincludes:

∙Features

∙OverviewoftheProblemtoSolve

∙SettinguptheSolidPhysicsinSimulation（ANSYSWorkbench）

∙SettinguptheFluidPhysicsandANSYSMulti-fieldSettingsinANSYSCFX-Pre

∙ObtainingaSolutionusingANSYSCFX-SolverManager

∙ViewingResultsinANSYSCFX-Post

Ifthisisthefirsttutorialyouareworkingwith,itisimportanttoreviewthefollowingtopicsbeforebeginning:

∙SettingtheWorkingDirectory

∙ChangingtheDisplayColors

Unlessyouplanonrunningasessionfile,youshouldcopythesamplefilesusedinthistutorialfromtheinstallationfolderforyoursoftware（/examples/）toyourworkingdirectory.Thispreventsyoufromoverwritingsourcefilesprovidedwithyourinstallation.Ifyouplantouseasessionfile,pleaserefertoPlayingaSessionFile.

Samplefilesreferencedbythistutorialinclude:

∙

∙

∙

∙

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

Wall:

NoSlip

Wall:

Adiabatic

Timestep

Transient

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:

Aninitialpressureof100Paisappliedtoonesideofthethinplateforsecondsinordertodistortit.Oncethispressureisreleased,theplateoscillatesbackwardsandforwardsasitattemptstoregainitsequilibrium（vertical）position.Thesurroundingfluiddampstheoscillations,whichthereforehaveanamplitudethatdecreasesintime.TheCFXSolvercalculateshowthefluidrespondstothemotionoftheplate,andtheANSYSSolvercalculateshowtheplatedeformsasaresultofboththeinitialappliedpressureandthepressureresultingfromthepresenceofthefluid.Couplingbetweenthetwosolversisrequiredsincethesoliddeformationaffectsthefluidsolution,andthefluidsolutionaffectsthesoliddeformation.

ThetutorialdescribesthesetupandexecutionofthecalculationincludingthesetupofthesolidphysicsinSimulation（withinANSYSWorkbench）andthesetupofthefluidphysicsandANSYSMulti-fieldsettingsinANSYSCFX-Pre.IfyoudonothaveANSYSWorkbench,thenyoucanusetheprovidedANSYSinputfiletoavoidtheneedforSimulation.

3.SettinguptheSolidPhysicsinSimulation（ANSYSWorkbench）

Thissectiondescribesthestep-by-stepdefinitionofthesolidphysicsinSimulationwithinANSYSWorkbenchthatwillresultinthecreationofanANSYSinputfile.Ifyouprefer,youcaninsteadusetheprovidedfileandcontinuefromSettinguptheFluidPhysicsandANSYSMulti-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.SelecttheprovidedfileandclickOpen.

8.MakesurethatishighlightedandclickNewsimulationfromtheleft-handtaskbar.

CreatingtheSolidMaterial

1.WhenSimulationopens,expandGeometryintheprojecttreeatthelefthandsideoftheSimulationwindow.

2.SelectSolid,andintheDetailsviewbelow,selectMaterial.

3.UsethearrowthatappearsnexttothematerialnameStructuralSteeltoselectNewMaterial.

4.WhentheEngineeringDatawindowopens,right-clickNewMaterialfromthetreeviewandrenameittoPlate.

5.EnterforYoung'sModulus,forPoisson'sRatioand2550forDensity.

Notethattheotherpropertiesarenotusedforthissimulation,andthattheunitsforthesevaluesareimpliedbytheglobalunitsinSimulation.

6.ClicktheSimulationtabnearthetopoftheWorkbenchwindowtoreturntothesimulation.

BasicAnalysisSettings

TheANSYSMulti-fieldsimulationisatransientmechanicalanalysis,withatimestepofsandatimedurationof5s.

1.SelectNewAnalysis>FlexibleDynamicfromthetoolbar.

2.SelectAnalysisSettingsfromthetreeviewandintheDetailsviewbelow,setAutoTimeSteppingtoOff.

3.SetTimeStepto.

4.UnderTabularDataatthebottomrightofthewindow,setEndTimetofortheSteps=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.

1.Right-clickFlexibleDynamicinthetreeandselectInsert>FluidSolidInterfacefromtheshortcutmenu.

2.Usingthesameface-selectionproceduredescribedearlier,selectthethreefacesofthegeometrythatformtheinterfacebetweenthesolidandthefluid（low-x,high-yandhigh-xfaces）byholdingdowntoselectmultiplefaces.Notethatthisloadisautomaticallygivenaninterfacenumberof1.

PressureLoad

Thepressureloadprovidestheinitialadditionalpressureof100[Pa]forthefirstsecondsofthesimulation.Itisdefinedusingastepfunction.

1.Right-clickFlexibleDynamicinthetreeandselectInsert>Pressurefromtheshortcutmenu.

2.Selectthelow-xfaceforGeometry.

3.IntheDetailsview,selectMagnitude,andusingthearrowthatappears,selectTabular（Time）.

4.UnderTabularData,setapressureof100inthetablerowcorrespondingtoatimeof0.

Note:

Theunitsfortimeandpressureinthistablearetheglobalunitsof[s]and[Pa],respectively.

5.Younowneedtoaddtwonewrowstothetable.Thiscanbedonebytypingthenewtimeandpressuredataintotheemptyrowatthebottomofthetable,andSimulationwillautomaticallyre-orderthetableinorderoftimevalue.Enterapressureof100foratimevalueof,andapressureof0foratimevalueof.

Thisgivesastepfunctionforpressurethatcanbeseeninthecharttotheleftofthetable.

WritingtheANSYSInputFile

TheSimulationsettingsarenowcomplete.AnANSYSMulti-fieldruncannotbelaunchedfromwithinSimulation,sotheSolvebuttonscannotbeusedtoobtainasolution.

1.Instead,highlightSolutioninthetree,selectTools>WriteANSYSInputFileandchoosetowritethesolutionsetuptothefile.

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:

.AfteryouhaveplayedthesessionfileasdescribedinearliertutorialsunderPlayingtheSessionFileandStartingANSYSCFX-SolverManager,proceedtoObtainingaSolutionusingANSYSCFX-SolverManager.

CreatingaNewSimulation

1.StartANSYSCFX-Pre.

2.SelectFile>NewSimulation.

3.SelectGeneralandclickOK.

4.SelectFile>SaveSimulationAs.

5.UnderFilename,typeOscillatingPlate.

6.ClickSave.

ImportingtheMesh

1.Right-clickMeshandselectImportMesh.

2.Selecttheprovidedmeshfile,andclickOpen.

Note：

ThefilethatwasjustcreatedinSimulation,,willbeusedasaninputfilefortheANSYSSolver.

Settingthe