STAR-CCM用于汽車外流場(chǎng)的計(jì)算

STAR-CCM+用于汽車外流場(chǎng)

的

計(jì)

算總

結(jié)導(dǎo)

入

面

網(wǎng)

格

.檢查，修補(bǔ)面網(wǎng)格設(shè)定邊界名稱及類型抽取特征線選擇網(wǎng)格模型設(shè)定網(wǎng)格尺度生成新的面網(wǎng)格(可選)

生

成

體網(wǎng)格步

驟1.2.3.4.5.6.7.

8

.9

.選

擇物

理模

型10

.

設(shè)定

邊界條件

11

.

設(shè)定初始條件.E

力

位1.導(dǎo)入面網(wǎng)格>

創(chuàng)建一個(gè)新

simulation

>

導(dǎo)入網(wǎng)>

顯

示網(wǎng)2.檢

查

，

修

補(bǔ)

面

網(wǎng)

格●

檢查freeedges和non-manifoldPeqin

t:Bcundary

35Peen

aaFreeEdges

ol

edes□Mkheindyy

permeternnmeifee

edaeskfrMaiMaik??edgesNOTE:

有兩種檢查Free

edges和non-manifold

edges的方法1.Feature

cuve>new

feature

curve>

markedges…Mark

Feature

Ease

Optiont

w

parts

>threshold…2.

檢

查

，

修

補(bǔ)

面

網(wǎng)

格

(

續(xù))oZipthefreeedges原名稱重命名設(shè)定類型Boundary

2car

mirrorWalBoundary

24car_wheelSWalBoundary

25car_bottomWallBoundary

35car_coverWalllBoundary

36car

rearWallBoundary

37Symm_planeSymmetry

planeBoundary

372groundWalllBoundàry

373IntoinletTa

eSVelocity

inletOLUFOFE

EStar

1ContinuaRegionsRegion

1sy

m

mgroundinletside_wallupper_wallcar-wheelscar_bottomcar_covercar_mirrorFeature

CurvesReportsPlotsScenes3.

設(shè)定邊界名稱及類型4.抽

取

特

征

線BoundariesBoundaries》》

《《Feature

EdgeOptions-?

MarksharpedgesSharpedgeangle31□Mark

free

edgesMark

non-manifold

edgesMarkpatch

perimeters□Mark

boundary

perimetersangle(31)來(lái)抽取特○以Sharp1

-

els1:car_bottom1:car_cover1:car_rear1:ground1:inlet1:outletwct:caSeledgeRegion

Region

Region

Region

Region

Region

Region

Region1:car_mirrorApplyCloseEelp4.

抽取特征線(續(xù))刪除不需要的特征4.

抽取特征線(續(xù))5.選擇網(wǎng)格模型(meshing

model)continuum其<Notrequiredbyothermeshingmodels><Notrequiredbyothermeshingmodels>Close

HelpoContinua

>new

>mesh選擇SurfaceRemesher和Polyhedra,lEnabled

Meshing

models

Prism

Layer

Mesher?Polyhedral

Mesher?SurfaceRemesherMeshingModelSelectionSurfaceMeshSurfacewrapper<0ptional>NumberofPrismlayerPrism

layerstretchingSurface

growthrateSurface

relativeSurface

minimumVolume

sourcesizecar

botomcar_cove了car_rearSymm_plane41.31.2

sh

100%25%40mmDeiautDefautDefaultDefaut食

Star

1ContinuaMesh

1Mo

delsSurface

Remesher

Polyhedral

Mesher

Prism

LayerMesherReferenceValuesBase

SizeNumberofPrism

Layers

Prism

LayerStretchingPrism

LayerThickness

RelativeSizeSurfaceCurvatureSurfaceGrowth

RateSurface

ProximitySurfaceSizeRelative

MinimumSize

RelativeTargetSizeWolume

Mesh

DensityVolumeSourcesRegionsRegion

1Baundaries第

car-wheels9

Mesh

Conditions姆

Custom

Surface

Curvature

粥

Custom

Surface

Proxim

ity

CustomSurface

Size號(hào)

Customize

Prism

Mesh愛(ài)CustomizeSurface

Remeshingcar_bottom6.

設(shè)

定

網(wǎng)

格

尺

度Base

sizePrism

layer

thicknessDisabledDisabledDisabledDefaultLocalsettingsGlobalsettingstargetsize1805.5mm

mm6.設(shè)定網(wǎng)格尺度(續(xù))○

為加密車體周圍尤其是尾部區(qū)域，可創(chuàng)建一個(gè)volumesource.(Tools>volume

shapes>newshape>briek)-Selec1a

cormer

to

edit-

LstCorner

O1st

CornerPosition

×

-1.399871Y

011gds

Z-0.390654Znd

CornerFo

siton

X

6.680882Y

-1.420645

Z1.669951Create

Brick.Wolume□

Display

Foint

Tool]5nap

To

Fan

plane

sectionCarnerLack口LackClo

seBrick

2Apply2na合7.生

成

新

的

面

網(wǎng)

格

(

可

選

)面網(wǎng)管：19.5萬(wàn)(兩分鐘8.生

成

體

網(wǎng)

格體網(wǎng)路：36.7萬(wàn)(兩十分鐘左8

.

生

成

體網(wǎng)

格(

續(xù)

):

車

身

表

面

各8.

生成體網(wǎng)格(續(xù)):截面圖(1)8

.生成體網(wǎng)格(續(xù)):截面圖(2)8

.

生

成

體網(wǎng)

格(

續(xù)

):

邊

界

層網(wǎng)格

e選各加國(guó)反物在理Space

床范

Threedi

mentionalMaterialGasMotionStationaryFlowSegregatedflowEguation

of

stateConstantdensityTimeSteadyVisco

uSregimeTurbulentturbulenceK-E

turbulenceEnabled

Physicsmodels?Wall

Distance?

Two-LayerAlly+WallTreatment?

Reallzable

Two-Layer

K-Epsifon?K-Epsllon

Turbulence?

Turbulent?

Steady?Constant

DensitySegregated

Flow?

CasStationary?

Three

Dimensional9.選

擇

物

理

模

型Optional

Physicsmodels-Passive

ScalarLagrangian

MultiphaseTransitionSegregated

Fluid

Enthalpy[Gravity□Segregated

FluidTemperature?

Auto-select

recommended

physics

modelsPhysics

ModelSelectionClose

Help<0ptional>Boundaries類型物理?xiàng)l件car

mirrO廠WallWall

(default)car_wheelsWallWall(defaut)car

bottomWallWall(default)carcoverWallWall(default)car_rearWalllWall(default)SymmPlaneSymmetry

planeSymmetryplane(defa

ult)NBRLnd=0.0WalL=0.07*2Wall(切向速度ai

X

E

學(xué)inleeVelocity速度大小曰

蝶

曰bo

undar

yRegion

1Boundariescar_bottomcar_covercar_mirroicar_rearcar_wheelsground

inlet

MeshConditions

□

PhysicsConditionsFlow

DirectionSpecification

TurbulenceSpecificationVelocitySpecification

PhysicsValuesTurbulence

IntensityConstant曰

Turbulent

Length

Scale

Constant

Velocity

Magnitude●

Constant

outletside_wallSymmUpper-wall10.設(shè)定邊界條件conditions

Feature

Curves田

Mesh

Canditisns在田

田田

田

田田

田Physics

1odels買(mǎi)

Three

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Gase-

□

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FlovwConstant

Density司

Steady

Turbulent

K-Epsilon

Turbulence司

RealizableTwo-LayerK-Epsilon Tvuo-LayerAlly+WallTreatment

wall

DistanceReferenceValuesReference

PressureInitial

Conditions

Static

PressureConstantTurbulence

IntensityConstantTurbulence

SpecificationTurbulent

LengthScaleConstantVelocityConstantRegionsDerived

PartsSolwers變量初始設(shè)定Pressure0(gauge)velocity

cwatenenf以進(jìn)

種

第

醫(yī)

流

解Jur

bulent

iniei0.01Turbulent

lengthscale0.18(m)11.

設(shè)

定

初

始

條

件Initialconditions司

心中Residua12.開(kāi)

始

計(jì)

算●

使用缺省的solver

參數(shù)，設(shè)定最大迭代步數(shù)，點(diǎn)擊“Run”Residualsteration一Continuity一x-momentum一Y-momertum一Z-momertum一Tke一Tdr12.開(kāi)始計(jì)算(續(xù))

監(jiān)視阻力系數(shù)…0.350.340.33O.32O.31口.3o.2s+o.2s+0.27+0.26-0.25

O10001200

1400

1600

1800Iteration-Force

Coe

clent

1

Mo

itor

4ForceCoefricient1Plotfoce

Coeidiant

I

Wontor

4goo3000200022002400260028004006002001

3

.

后

處

理

：

速

度

矢

量13.后處理(續(xù)):速度矢量·Scenes>new

scene>vector+人

leM:()

雨

三(T13.后處理(續(xù)):壓力分布o(jì)

Scenes

>new

scene

>scalar.Prossure(Pa)-922.57375.22-1571.5-2220.41024.113

.后處理(續(xù)):流線·Derivedparts>newpart>streamlineVeloclty:Magnitude(m/s)21.022

31.3680.3286810.6754

1.71