Flat Plate Boundary LayerWord文件下载.docx
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Flat Plate Boundary LayerWord文件下载.docx
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FLUENT6.3.26
Select2ddp(2D,double-precisionversion)fromthelistofoptionsandclickRun.
ImportFile
MainMenu>
File>
Read>
Case...
NavigatetoyourworkingdirectoryandselecttheplateBL.mshfile.ClickOK.
Checkthatthedisplayedinformationisconsistentwithourexpectations.
AnalyzeGrid
First,wecheckthegridtomakesurethattherearenoerrors.
Grid>
Check
Anyerrorsinthegridwouldbereportedatthistime.Checktheoutputandmakesurethattherearenoerrorsreported.
Grid>
Info>
Size
Howmanycellsandnodesdoesthegridhave?
Display>
Grid
DefineProperties
Define>
Models>
Solver...
Usethedefaultsetting.ClickOK.
Viscous
SelectLaminarunderModel.
ClickOK.
Energy
UsethedefaultandclickOK.
Materials
MakesureairisselectedunderFluidMaterials.SetDensityto1.00andViscosityto1e-4sothatwecangetReof1e4.
ClickChange/Create.
OperatingConditions
Usethedefaultvalue.ClickOK.
BoundaryConditions
Setinlettovelocity-inletboundarytype.ThenclickSet...Setthevelocitymagnitudeto1m/s.Setoutlettopressure-outletboundary.Usegagepressureof0Pa.Usethedefaultvalueofwallfortheplate.Setthetoptosymmetryboundarytype.Symmetryboundaryconditionmeansthatthecomponentnormaltothewalliszero.
Step5:
Solve!
Solve>
Control>
Solution
We'
lluseasecond-orderdiscretizationscheme.UnderDiscretization,setMomentumtoSecondOrderUpwind.
Initialize>
Initialize...
Usetheinletconditionsasourintialguessvalue.SelectinletunderComputeFrom.
ClickInit.
lliteratethesolutionuntiltheresidualforeachequationfallsbelow1e-6.
Monitors>
Residual...
SetAbsoluteCriteriaforallequationsto1e-6.
Also,underOptions,selectPlot.Thiswillplottheresidualsinthegraphicswindowastheyarecalculated,givingyouavisualfeelforif/howtheiterationsareproceedingtoconvergence.
Write>
Case...
ThiswillsaveyourFLUENTsettingsandthemeshtoa"
case"
file.TypeinplateBL.casforCaseFile.ClickOK.
Iterate
SettheNumberofIterationsto1000.ClickIterate.
Theresidualsforeachiterationareprintedoutaswellasplottedinthegraphicswindowastheyarecalculated.
Savethesolutiontoadatafileaftersolutionisconverged:
Data...
EnterplateBL.datforDataFileandclickOK.Checkthatthefilehasbeencreatedinyourworkingdirectory.Youcanretrievethecurrentsolutionfromthisdatafileatanytime.
Step6:
AnalyzeResults
PlotVelocityVectors
Let'
splotthevelocityvectorsobtainedfromtheFLUENTsolution.
Vectors
Zoominalittleusingthemiddlemousebuttontopeermorecloselyatthevelocityvectors.
Remembertosavetheimageusing
Hardcopy
Nowwewilldisplaythepressurecoefficientcontour.Firstsetthereferencevelocity.
Report>
ReferenceValues
SelectinletunderComputeFrom
Contours...
SelectPressure...andStaticPressurefromunderContoursOf.ThenselectPressureCoeffient.CheckFilledboxandsetLevelsto90.
Zoominattheleadingedge.
Whyisthepressurenotconstantattheleadingedgeoftheplate?
Nowwewillplottheskinfrictioncoefficientalongtheflatplate.
Plot>
XYPlot
ChangePressuretoWallFluxes.AfterthatchangeWallShearStresstoSkinFrictionCoefficient.UnderSurfaces,selectplate.ClickPlot.
(Clickpictureforlargerimage)
ComparewithskinfrictionwiththeBlasiussolution.Loadthefileandplot.
Also,youcanchangethesymbolintolinesbygoingtoCurves...andclickonthecurrespondingpatternthatyoulike.IncreasetheWeightto3forreadability.Bothresultsshouldbefairlysimilar.
Nowwewilllookatthevelocityalongtheplateatoutlet.
XYPlot
UncheckedPositiononXAxisandcheckPositiononYAxis.UnderPlotDirection,setXto0andYto1.UnderXAxisFunction,selectVelocity...AfterthatchangeVelocityMagnitudetoXVelocity.Finallyundersurface,clickoutlet.Beforewearereadytoplot,clickontheAxes...andrescaleyaxisfrom0to0.12.Also,checkedtheMajorRulesandMinorRulesforxandy.
ClickApplyandPlot.
TocomparewiththeBlasiussolution,clickLoadFile...andselectthecorrectfile(title"
SkinFrictionCoefficient"
)
(labels"
Position"
"
((xy/key/label"
Blasius"
0.02000.04695189
0.04000.03320000
0.06000.02710769
0.08000.02347595
0.10000.02099752
0.12000.01916803
0.14000.01774615
0.16000.01660000
0.18000.01565063
0.20000.01484749
0.22000.01415653
0.24000.01355384
0.26000.01302211
0.28000.01254842
0.30000.01212293
0.32000.01173797
0.34000.01138751
0.36000.01106667
0.38000.01077150
0.40000.01049876
0.42000.01024574
0.44000.01001018
0.46000.00979015
0.48000.00958401
0.50000.00939038
0.52000.00920802
0.54000.00903590
0.56000.00887307
0.58000.00871875
0.60000.00857220
0.62000.00843281
0.64000.00830000
0.66000.00817328
0.68000.00805218
0.70000.00793632
0.72000.00782532
0.74000.00771884
0.76000.00761660
0.78000.00751832
0.80000.00742375
0.82000.00733265
0.84000.00724483
0.86000.00716010
0.88000.00707826
0.90000.00699917
0.92000.00692268
0.94000.00684864
0.96000.00677692
0.98000.00670741
1.00000.00664000
Whatisthenoticeablydifferentbetweentwosolutions?
Whyisthevelocityovershoot1forFLUENT'
ssolution?
Nowwewillcomparethevelocityprofileattwosections.Createanothersectioninthemiddleoftheplate.
Surface>
Line/Rake
Checkthelinetoolsboxandsettheinitialcoordinateof(0.5,0)tofinalcoordinateof(0.5,0.5).UnderNewSurfaceName,typeinx_0.5.
Wecannowplotcancomparethevelocityprofileatthemidpointandtheoutletoftheflow.
UnderSurfaces,selectoutletandx_0.5andPlot.
Step7:
VerifyResults
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- 关 键 词:
- Flat Plate Boundary Layer