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1、二维三通管内流体的流动分析一、实例概述在实际输水、输油、输气的管路工程中，经常会遇到分支或交叉的管路，三通管就是其中最为常见的一种。下图所示为水平放置的输水管路中的三通管，干管为100mm勺钢管，管段中间位置接入50mm的支管，干管水流方向为水平方向从左至右，流速2m/s。支管的水流速度为1m/s.那么，支管水流汇入后对干管水流产生多大影响，交会后在下游的流动情况如何。oShowlabels_IShowcolors边界类型定义完成后，需要将网格文件输出。7、输出为liuye.msh,并选中Export2-D(X-Y)Mesh,表示输出的为二维模型网格文件。四、求解计算1、打开FLUENT6.3
2、.26,选择2d计算器。2、读入“liuye.msh”文件并检测，如图：Readingl,C:UsersadriinDesktopliuye.nsh,.2208nodes.305nixedwallFaces,zonp3.17nixedoutflowFaces,zone4.5nixedvelocity-inletFaces,zone5.17nixeduelocity-inletfaces,zone6.3898nixedinteriorfaces,zone8.2035quadrilateralcells,zone2,Building.grid.materials,interface,donains
3、,zones,default-interiorin1in2outwallfluidshellconductionzones,Done.GridCheckDomainExtents:x-coordinate:min(n)=O.OBMQfe*OOOvmax(n)=1.OBBO0te*SO1y-coordinate:nin(m)=-5_000000e+0O0,max(n)=5_0000B9e-002Uolumestatistics:minimumvolume(m3):9.999772e-006maximumvolume(m3):9.9O0248e-i0O4totalvolume(m3):1.2475
4、61e+000Faceareastatistics:nininunfacearea(m2):1.0O9OO2e-0O3maximumFacearea(m2):9.950D66e-0O2Checkingnumbprofnodespercell.CheckingnumbproFfacespercell.Checkingthreadpointers.CheckingnumberofcellsperFace.CheckingFacecells.Checkingbridgefacps.Checkingright-handedcells-CheckingFacehandedness.Checkingfac
5、enodeorder.Checkingelementtypeconsistency.Checkingboundarytyps:CheckingFacepairs.Checkingperiodicboundaries.Checkingnodecount.Checkingnosoluecellcount-ChpckingnosolueFacecount.CheckingFacechildren.Checkingcellchildren.Checkingstorage.Done.3、执行Grid-Scale命令，查看个方向尺寸范围。4、执行Define-Models-Solver命令，进行模型设置。
6、5、本例水流速度为1-2m/s，管内为湍流流动，故选择epsilon2eqn模型。6、定义流动材料为水JFluentDatabaseMaterials7、设置环境为1大气压，且不考虑重力8、边界数据定义，如图：2BoundaryConditionsVelocityInletZoneNameIin1MomentumThermalRadiationSpecies|DPMMultiphase|UDS|AbsoluteVelocitySpecificationMethod|Magnitude,NormaltoBoundaryReferenceFrameconstantVelocityMagnitude
7、(m/s)阻TurbulenceSpecificationMethodintensityandHydraulicDiameterTurbulentIntensity(%)1一HydraulicDiameter(m).厂imVelocityInletZoneNamein2MomentumThermalRadialionSpeciesDPMMulliphaseUDSVelocitySpecif!cationMethodhdagnhude.NormaltoBoundaryReferenceFrarne:VelocityMagnitudem/s2constantTurbulenceSpecificat
8、ionMethodintensityandHydraulicDiameter，TurbulentIntensity(%|HydraulicDiameter(m)OKCancelHelp9、选择需要计算的方程，定义方程的松弛因子以及方程解算的算法,如图:Under-RelaxationFactorsPressure-VelocityCouplingDicrflizatiDnSIMPLEPressureSolutionControlsStandardJFirstOrderUpwindFirstOrderUpwindFirstOrderUpwindMomentumTurbulentDissipati
9、onRate10、对流场进行初始化，如图:Z!Soli.tiarJni：ezationComputeFromReferenceFrameall-zones，eRelativetoCellZoneAbsoluteInitialValuesGaugePressurepascalgXVelocitym/sqYVelocity(m/s)gTurbulentKineticEnergy(m2/s2。.讪。6InitIRrEtIApplyICloseHelp|11、打开残差曲线图，设置个参数的收敛精度要求。12、设置迭代次数为1000并开始解算，如图:IterateIterationIterate|Appl
10、y|Close|Helpj1曹FLUENT0：FluentInc=回密13、解算结果显示，本例在计算到第68步后达到了收敛14、压强等值线图，如图：QContourstlpliOOSPPprFilledNodeVahidsGlab-alRangeAutoRanEClip*luDrawProfilesrawGridCafifoursolPres&urCu.S切tkPressureMlinpjgscalMatchLeveltSetup网司广5SurlsccNamePatternSurfacesI=defauhIvuteriorfinlfin?outwallSurlccTypesiaxiscllpY
11、Wcxhwusl-hhlarn-7675,652DisplayComputeClose-IMax(p-ascaQ15、压强云图，如图:FLUENTOFluHtInI.n回空FFinedRUodleValuesFGlabalRomgc目AutoHongcPressure.SialicPircEsureUlnpnscnqMax-ICliptoFDirawProllllesFDrawGridLewisSetupSurfaceNamePslfftrn-7C75,fi52卜71.0847Suriaccs_=_兰dcfaulk-inlEriariniin2outwallOpllansConitnursMS
12、urfaceTypes火li-axisahMatdfe|clip-surfexhami-lsniJIanHePpDisplayComputeICloseIg!eac1!I-IlMME_1fl9h4D-ai?waTjUMIJ-SiEaftnIseioaIHdftirI-dlIMDI-f199V-OESk-OI恤tSOnijmaj顿16、速度云图，如图:皆FLUEJMTDaiFluentIncpjpliaiisr7n?IMoile!VnIuesGlobalRingsAuloRangeClip1jRun日七AulcScbIcDraurGridStyleflirawSenile厄SkipdCustuinVedlurs.-.VEdturE；i1|VelDciiyCfilqiFhiyVelocity.VclocilyMgmltudKrMin|mfs：JM-eikn*胜刁19.542101Snriewsder-&ullt-iiMedorifllin2outwall3.8W13fITWSuriNamePacirnDE邛沽y|CcimpiitgFiijrllBERTypesaxl-scilp-surftrxIlus
