1、有两种检查有两种检查Free edges Free edges 和和non-manifold edgesnon-manifold edges的方法的方法1.1.Feature curve new feature curve Feature curve new feature curve mark edgesmark edges2.2.Derived parts new parts Derived parts new parts thresholdthreshold 2.检查,修补面网格(续)Zip the free edges3.设定边界名称及类型原名称原名称重命名重命名设定类型设定类型Bou
2、ndary 2 Boundary 2 car_mirrorcar_mirrorWallWallBoundary 24Boundary 24car_wheelcar_wheels sWallWallBoundary 25Boundary 25car_bottocar_bottommWallWallBoundary 35Boundary 35car_covercar_coverWallWallBoundary 36Boundary 36car_rearcar_rearWallWallBoundary 37 Boundary 37 Symm_plaSymm_planeneSymmetry plane
3、Symmetry planeBoundary 37 Boundary 37 2 2groundgroundWallWallBoundary 37 Boundary 37 3 3inletinletVelocity inletVelocity inletBoundary 37 Boundary 37 4 4outletoutletPressure outletPressure outletBoundary 37 Boundary 37 5 5Side_wallSide_wallWallWallBoundary 37 Boundary 37 6 6Upper_walUpper_wall lWall
4、Wall(Boundary 37 was split into 6 boundaries)4.抽取特征线以Sharp edge angle(31)来抽取特征线.4.抽取特征线(续)删除不需要的特征删除不需要的特征线线4.抽取特征线(续)增加想要的特征线5.选择网格模型(meshing model)Continua new mesh continuum,Continua new mesh continuum,选择选择Surface Surface RemesherRemesher 和和Polyhedral Polyhedral meshermesher,Prism,Prism layer lay
5、er meshermesher.Note:Note:当不想重新生成面网格时,可不选择当不想重新生成面网格时,可不选择surface surface meshermesher。6.设定网格尺度boundariboundariesesSurface sizeSurface sizePrism meshPrism meshcar_mirrcar_mirrororDisabledDisabledDefaultDefaultcar_whecar_wheelselsDisabledDisabledDefaultDefaultcar_bottcar_bottomomDisabledDisabledDefau
6、ltDefaultcar_covecar_cover rDisabledDisabledDefaultDefaultcar_rearcar_rearDisabledDisabledDefaultDefaultSymm_pSymm_planelaneDefaultDefaultDefaultDefaultgroundgroundDefaultDefaultDefaultDefaultinletinletDefaultDefaultDefaultDefaultoutletoutletDefaultDefaultDefaultDefaultSide_walSide_wall lDefaultDefa
7、ultDisabledDisabledUpper_wUpper_wallallDefaultDefaultDisabledDisabledGlobal Global settingssettingsLocal Local settingssettingsBase sizeBase size180 mm180 mmPrism layer Prism layer thicknessthickness5.5 mm5.5 mmNumber of Prism Number of Prism layerlayer4 4Prism layer Prism layer stretchingstretching
8、1.31.3Surface growth Surface growth raterate1.21.2Surface relative Surface relative target sizetarget size100%100%Surface minimumSurface minimum25%25%Volume source Volume source sizesize40mm40mm6.设定网格尺度(续)为加密车体周围尤其是尾部区域,可创建一个为加密车体周围尤其是尾部区域,可创建一个volume source.volume source.(Tools volume shapes new sh
9、ape brick)Tools volume shapes new shape brick)7.生成新的面网格(可选)面网格面网格:19.6:19.6万万 (两分钟两分钟左右左右)8.生成体网格体网格体网格:86.7:86.7万万 (两十分钟左两十分钟左右右)8.生成体网格(续):车身表面网格8.生成体网格(续):截面图(1)8.生成体网格(续):截面图(2)8.生成体网格(续):边界层网格9.选择物理模型依次选择如下物理模型:依次选择如下物理模型:SpaceSpaceThree Three dimentionaldimentionalMaterialMaterialGasGasMotionM
10、otionStationaryStationaryFlowFlowSegregated Segregated flowflowEquation of Equation of statestateConstant Constant densitydensityTimeTimeSteadySteadyViscous Viscous regimeregimeTurbulentTurbulentturbulenceturbulenceK-E turbulenceK-E turbulence10.设定边界条件BoundaBoundariesries类型类型物理条件物理条件car_mirrcar_mirr
11、ororWallWallWall(default)Wall(default)car_whecar_wheelselsWallWallWall(default)Wall(default)car_bottcar_bottomomWallWallWall(default)Wall(default)car_covcar_covererWallWallWall(default)Wall(default)car_rearcar_rearWallWallWall(default)Wall(default)Symm_Symm_planeplaneSymmetrSymmetry planey planeSymm
12、etry Symmetry plane(default)plane(default)groundgroundWallWallWall(Wall(切向速度切向速度40m/s)40m/s)inletinletVelocity Velocity inletinlet速度大小速度大小40m/s 40m/s(湍流:湍流:I=0.01I=0.01,l=0.18m)l=0.18m)outletoutletPressure Pressure outletoutlet表压为表压为0 0(湍流:I=0.01I=0.01,l=0.18m)l=0.18m)Side_waSide_wall llWallWallWall
13、(Slip)Wall(Slip)Upper_Upper_wallwallWallWallWall(Slip)Wall(Slip)boundary boundary conditionsconditionsNoteNote:l=0.07L=0.07*2ab/(a+l=0.07L=0.07*2ab/(a+b)b)11.设定初始条件Initial Initial conditionsconditions变量变量初始设定初始设定PressurePressure0(gauge)0(gauge)velocity components velocity components 40,0,0(40,0,0(m/
14、sm/s)Turbulent intensityTurbulent intensity0.010.01Turbulent length scaleTurbulent length scale0.18(m)0.18(m)NoteNote:可以先计算层流解作:可以先计算层流解作为初场为初场12.开始计算 使用缺省的使用缺省的solversolver参数,设定最大迭代步数,点击参数,设定最大迭代步数,点击“Run”Run”12.开始计算(续)监视阻力系数监视阻力系数13.后处理:速度矢量Scenes new scene vectorScenes new scene vector13.后处理(续):w
15、all y+13.后处理(续):压力分布Scenes new scene scalarScenes new scene scalar13.后处理(续):流线Derived parts new part streamlineDerived parts new part streamline13.后处理(续):阻力系数,升力系数 计算投影面积计算投影面积(Report new report (Report new report frontal area)frontal area)Report ValueReport Value:1.0361.036 计算阻力系数计算阻力系数(Report new report(Report new report force coefficient)force coefficient)Report Value:Report Value:0.3130.313 计算升力系数计算升力系数 (同上
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