流固耦合计算实例资料.docx

流固耦合计算实例资料.docx

《流固耦合计算实例资料.docx》由会员分享，可在线阅读，更多相关《流固耦合计算实例资料.docx（21页珍藏版）》请在冰点文库上搜索。

流固耦合计算实例资料

OscillatingPlatewithTwo-WayFluid-StructureInteraction

ANSYS-China

Introduction

Thistutorialincludes:

«Features

*OverviewoftheProblemtoSolve

«SettinguptheSolidPhysicsinSimulation（ANSYSWorkbench）

«SettinguptheFluidPhysicsandANSYSMulti-fieldSettingsinANSYSCFX-Pre

«ObtainingaSolutionusingANSYSCFX-SolverManager

«ViewingResultsinANSYSCFX-Post

Ifthisisthefirsttutorialyouareworkingwith,itisimportanttoreviewthefollowingtopicsbeforebeginning:

*SettingtheWorkingDirectory

*ChangingtheDisplayColors

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

Samplefilesrefereneedbythistutorialinclude:

*OscillatingPlate.pre

*OscillatingPlate.agdb

*OscillatingPlate.gtm

*OscillatingPlate.inp

1.Features

ThistutorialaddressesthefollowingfeaturesofANSYSCFX.

Component

Feature

Details

|aNSYSCFX-Pre

UserMode

GeneralMode||

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,andtheANSYSSolvercalculateshowtheplatedeformsasaresultofboththeinitialappliedpressureandthepressureresultingfromthepreseneeofthefluid.Couplingbetweenthetwosolversisrequiredsineethesoliddeformationaffectsthefluidsolution,andthefluidsolutionaffectsthesoliddeformation.

ThetutorialdescribesthesetupandexecutionofthecalculationincludingthesetupofthesolidphysicsinSimulation（withinANSYSWorkbench）andthesetupofthefluidphysicsand

ANSYSMulti-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-clickNewMaterialfromthetreeview

andrenameittoPlate.

Milfit

.（j•，,會更平皓时■白hCm»

■jlaWjHrrtefip*m

ThMmMr^rciLH：

lrv«y

.11

0CJ||"H1in

5.Enter2.5e06forYoung'sModulus,0.35forPoisson'sRatioand2550forDensity.

Notethattheotherpropertiesarenotusedforthissimulation,andthattheunitsforthesevaluesareimpliedbytheglobalunitsinSimulation.

6.ClicktheSimulationtabnearthetopoftheWorkbenchwindowtoreturntothe

simulation.

BasicAnalysisSettings

TheANSYSMulti-fieldsimulationisatransientmechanicalanalysis,withatimestepof0.1sandatimedurationof5s.

1.SelectNewAnalysis>FlexibleDynamicfromthetoolbar.

2.SelectAnalysisSettingsfromthetreeviewandintheDetailsviewbelow,setAutoTimeSteppingtoOff.

3.SetTimeStepto0.1.

4.UnderTabularDataatthebottomrightofthewindow,setEndTimeto5.0fortheSteps=1setting.

InsertingLoads

LoadsareappliedtoanFEAanalysisastheequivalentofboundaryconditionsinANSYS

CFX.Inthissection,youwillsetafixedsupport,afluid-solidinterface,andapressureload.

FixedSupport

Thefixedsupportisrequiredtoholdthebottomofthethinplateinplace.

1.Right-clickFlexibleDynamicinthetreeandselectInsert>FixedSupportfromtheshortcutmenu.

2.RotatethegeometryusingtheRotate丄buttonsothatthebottom（low-y）faceofthesolidisvisible,thenselectFace卜】andclickthelow-yface.

Thatfaceshouldbehighlightedtoindicateselection.

3.EnsureFixedSupportisselectedintheOutlineview,then,intheDetailsview,selectGeometryandclick1FacetomaketheApplybuttonappear（ifnecessary）.ClickApplytosetthefixedsupport.

Fluid-SolidInterface

ItisnecessarytodefinetheregioninthesolidthatdefinestheinterfacebetweenthefluidinCFXandthesolidinANSYS.Dataisexchangedacrossthisinterfaceduringtheexecutionofthesimulation.

1.Right-clickFlexibleDynamicinthetreeandselectInsert>FluidSolidInterfacefromtheshortcutmenu.

2.Usingthesameface-selectionproceduredescribedearlier,selectthethreefacesofthe

geometrythatformtheinterfacebetweenthesolidandthefluid（low-x,high-yandhigh-xfaces）byholdingdowntoselectmultiplefaces.Notethatthisloadisautomaticallygivenaninterfacenumberof1.

PressureLoad

Thepressureloadprovidestheinitialadditionalpressureof100[Pa]forthefirst0.5secondsofthesimulation.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.Thiscanbedonebytypingthenewtime

andpressuredataintotheemptyrowatthebottomofthetable,andSimulationwillautomaticallyre-orderthetableinorderoftimevalue.Enterapressureof100foratimevalueof0.499,andapressureof0foratimevalueof0.5.

TabularData

Steps

Time

FPe?

sur亡

1

1

0

100

2

1

0499

100

3

1

05

0.

4

1

0-

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.

5.UnderFilename,typeOscillatingPlate.

6.ClickSave.

ImportingtheMesh

1.Right-clickMeshandselectImportMesh