三维弯管的气泡流动能环学院热能工程汇报人：陈正浩 汇报时间：6月6日目录1 •意义 22. 物理模型 33. 操作步骤 33.1 1 •划分网格 33.1.2 General 设置3.1.3选择模型 53.1.4设置材料 63.1.5相态选择 73.1.6边界条件的设置 73.1.7求解控制参数的设置 93.1.8求解松弛因子的设置3.1.9收敛临界值的设置10320流场初始化设置 114. 结果后处理 121 •意义自然界和工程问题中会遇到大量的多相流动，如含沙水流、 各种喷雾冷却、气泡流动等正确的理解多相流动规律，才能合 理利用其流场特性来设置多相流装置并使用多相流实现各种目 的Fluent软件是多相流建模方面的领导者，它具有丰富的物理模 型、先进的数值方法以及强大的前后处理功能其丰富的模拟能 力可以帮助设计者洞察设备内那些难以探测的的现象2. 物理模型本次作业所模拟的是三维弯管内的气泡流动下图是模型示 意图，利用ANSYS进行系统建模，大管管径定位0.5m,小管管 径定位0.1m,大管长度分别为4m和2m,小管长度为lmo小 管与大管之间联通0.750 2.2503. 操作步骤3.1 1 •划分网格首先设置入口出口和壁面。
设置完后，依次点击Mesh选项的Sizing和Method,将网格大小设为0.05m,并选用6面体网格Hex Dominant,最后运行Generateo网格如图所示1.250 3.7503.1.2 General 设置在General选项中选择Steady稳态情况，选择下方的Gravity重力选项，将Y轴设为・9.8•如图所示MeshingMesh GenerationSolution SetupeneralModelsMaterialsPhasesCell Zone ConditionsBoundary Conditions Mesh In terfaces Dyn amic Mesh Reference ValuesSolutionSolution MethodsSolution ControlsMonitorsSolution InitializationCalculation ActivitiesRun CalculationResultsGraphics and Animations PlotsReportsGeneralScale...Check Report QualityDisplay...MeshSolverType(•)Pressure-Based ODe nsity 七 asedTime'•：( SteadyC〕Transien t0 GravityVelocity Formulation⑥ Absolute:」RelativeUnits...Gravitati onal Accelerationppp3.1.3选择模型双击Viscous Model,选择k-epsilon模型，所有数值选择默认值。
再双击Multiphase,选择VOF模型，勾选下方的Implicit Body Force,其他数值选择默认值，点击ok既可MeshingMesh GenerationSolution SetupGeneralModelsModelsMater>als Phases Cell Zone BoundaryMultiphase ModelMesh Interfeces Dynamic Mesh Reference ValueSolutionSokjt>on Method Sokjbon Control MonitorsSokjbon Inibaliza Calculation Activ Run Calculatx>nResultsGraphics PlotsReportsand AmEnergy ・ OffViscous - Standard k-e. Standard Wai Fn Radiation - OffHeat Exchanger - OffModelOoff Volume of AuidCD Mixture C)EuierianWet SteamCoupled Level Set + VOF I I Level SetVolume Fraction ParametersSchemeC2)Explicit (§) ImpSotOptions I 1 Open Channel Flow1 ] Open Channel Wave BC[]Zonal DiscretizationBody Force FormuiabonImpliot Body ForceCancelHelp3.1.4设置材料双击Materials,点击下方的Creat新建，点击右侧的FluentDatabase, 选择 water (h2o), copy 后点击下方 change/creat, 添加出water-liquid,材料添加完毕。
MeshingMesb GenerationMaterialsMaterialsFksdSobd atuminumOrder Materials by©NameCKermcal Formula^water-bqMidKiateriai t ype fluidChetmcai FormulaPteh2o<1>rTuefiv rnma r^averieNS water-liquid (h2o)xz 1NameFluent Database...User-Defined Database...ChariQe/CreateDeleteHelp3.1.5相态选择点击phase选项，将water设为第一相态，air设为第二相态，之后点击下方Interaction,设置表面张力Surface Tension,将表面张力设为0.023,点击ok既可oMeshingMesh GenerationSolution SetupGeneralModelsMaterialshaseslCell Zone Conditions Boundary Conditions Mesh Interface £ Dynamic Mesh Reference ValuesSolutionSolution MethodsSolution ControlsMonitorsSolution Initialization Calculation Activities Run CalculationResultsPhasesPhaseswater - PrimaryPhaseair ・ Secondary PhaseEdit...Interaction...ID23.1.6边界条件的设置点击 Boundary Conditions, 下方 phase 选择 mixture, type 选择velocity-inlet速度进口，点击下方Edit,将进口速度设为0.5, 下方 turbulenee 中白勺 Spec讦ication Method 选为 Intensity and Hydraulic Diameter,将下方的直径选为入口一直径0・2m,点击 oko In2入口设法如同Ini入口设法，进口速度设为0.8。
Out出 口设置时，选择压力出口 pressure outlet既可fl Pressure Outlet1 Zone NamePhaseXout|irafcjreMeshngMesh GenerabonSolution SetLpGeneralModelsMaterialsPhasesCel Zone ConditionsMesh InterfacesDynamic MeshReference ValuesSolutonSolution MethodsSolution ControlsMonitorsSolution InitializatonCalculation ActivitiesRun CalculabonResultsGraphics and AnimationsPlotsReportsBoundary ConditionsZonePhaseTypeIDEdit...Copy... Profits...Parameters...Operatng Conditions...Display Mesh...Penodc Conditjons...v velodty-inletmixture0 Highlight Zonefl Velocity InletZone Namenxttfe时5 MM|RKfation|speoes| DPR | fW»se| UDSSpec細ionMdhod into醐喇帕狀阳曲；如血 眩胡 Speoes| DPM , Mulbphdse| UDS |Gauge Presa/e (pascal)。
1 1constant vl 丨Bdddbrt Drectnn Spedfication Method rM to BoundaryVC Rddal Equttrum Pressure Distrt)ution TurWenceSpeofcabonMebod intenstyandHydraukDawterBackflw Turbdent Intensity (%)Backflow HydraukDan«tef(m)(X Caned Help3.1.7求解控制参数的设置选择Solution Methods命令，在Scheme下拉列表中选择PISO 算法，Gradient 下拉列表中选择 Green-Gauss Cell Bassed, Pressure 下拉列表中选择Body Force Weight,其他保持默认设置MeshingMesh GenerationSolution SetupGeneralModelsMaterialsPhasesCell Zoni ConditionsBoundary Conditions Mesh InterfacesDynamic MeshReference ValuesSolutionolution MethodsSolutio仃 ControlsMonitorsSolutio n In itializatio nCalculatio n ActivitiesRun CalculationResultsGraphics and Animations PlotsReportsSolution MethodsPressure-Velocity Coupli ng。