CFX_基础教程 (1)

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CFD

CFX 5.7

CEL

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CFD

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CFD?

CFD CFD

CFX-5.7

CFX-5

CFX-5

CFX-5 CFX -5

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CFD?

CFD

Computational Fluid

Dynamics

CFD

Coal combustion in a multi-burner furnace.

Courtesy of International Combustion Limited

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CFD

1970sCFD

.

1980s- CFD,

-CFDCFD

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CFD

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,

,

CFD

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,,

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= -

:

0= +

d v At

dcv cs

, 1D,

( ) ( )01 2

=

AV AV

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F

d m

dt d dcv cs = = +

( )v

t v vv A

= +

-

: , 1D,

F P A P A mV) mV)

m = AV

x 1 1 2 2 2 1+ = ( (

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( )Q Wt

d + v A =

e H dcv cs

- =

+-

: 1D

Q W 0 (mH) (mH)2 1 = +

AV=mH

2

v+u=

2

Pe

gze

+=

+

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,

,

,

- :

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- ()

-

-

- ,,

- CFX5

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Example: 2D Heat ConductionT=50

=2

0TT=100 T=0

q=0

=

=

+ =

q

q = -k T

for k = constant

T

orT

x

T

y

2

2 2

0

0

02 2

-

- :(),,

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:

-

- ()- :

>

>

Gauss

>

> ,

>

>

> ,

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:

- ,:

- ,-

- -

-

-

-

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:

- ,

-

-

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CFX-5.7

/ /

/ ()

/

/

GGI)

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CFX 5

CFX-5

-

-

-

-

- -

-

- ...

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.

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.

CFX

Expression

Language (CEL)

.

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.

k-

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.

.

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CFX-5

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F22

. CFX-5

0.95.Geometry and grid provided by DaimlerChrysler Aerospace AG

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)

Ensight

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CFX5.7

Step I:-

- 2D3D)

-

Step II: - CFX-Pre

-

-

-

Step III:

- CFX-Solve-

Step IV: - CFX-Post

-

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.- (,,

,)

- (,,

,)- (,

,,,)

-

II.

CFX-Pre

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III.

CFXCFX--55

-

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IV:

CFX-Post-

-

-

-

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CFX-Pre GUI

Tools Menu

Bar

Define

Menu

Bar

Object

Selector

Physics

Error

Summary

Viewer

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CFX-5.7

CFX-5 Solver

Manager

CFX-Post

---.res---.def

---.gtm

CFX-5 Solver---.def

---.res (binary)

---.out (ascii)

CFX-Prename.cfx

Cfx.##.pre

Third Party

Meshes

--- CFX-4--- TASCflow

--- ICEM

--- .

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CFX 5.7

.cfx CFX-Precase

.pre CFX-Pre session .def CFX-Pre CFX-Post

.res .def

.out

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CFD - Computational Fluid

Dynamics CFD

CFX-5

- -

-

CFX-Pre

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CFX-5.7

C

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CFX-5

.def

CFX-Post

CFX P

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CFX5 CFX-Pre

case

- , File New Simulation

- New Case File Namemixer- Save

CFX-Pre

M h I

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Mesh Import

Import Mesh

Import Mesh Mesh Format CFX-5 GTM File

Browsemixer.gtmSelect File for Import

OpenImport Mesh OK

CFX P

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CFX-Pre

C ti th Fl id D i

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Creating the Fluid Domain

Domains

Define DomainName

mixer OK

Domain:mixerGeneralOptions

- Fluid ListWater at 25 C

- Relative Pressure 1 atm

C ti th Fl id D i

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Creating the Fluid Domain

Edit Domain:mixer Fluid Models Fluid Models

- Heat Transfer Model Thermal Energy.

- Turbulence Model Zero Equation

- OK

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Creating the Boundary Conditions

Boundary Conditions

Namein1Define

Boundary OK Edit Boundary:in1 in

Domain:mixer Basic

Settings - Boundary Type Inlet.

- Location inlet1

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Edit Boundary:in1 in

Domain:mixerBoundary

Details

Boundary Details- Normal Speed 2.0 m/s.

- Static Temperature 315 K

- OK

in2inlet22.0 m/s

285 K

out

outlet Average Static Pressure

0.0 Pa

Creating the Boundary Conditions

S tti I iti l G

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Setting an Initial Guess

Global Initialization.- Automatic.

- -OK-.

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Setting Solver Parameters

Solver Control Timescale Control

Physical Timescale

Physical Timescale 5 s Max. No. Iterations

50

OK

Writing a Definition File def

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Writing a Definition File

def

Write Definition File.

- File Namemixer.def.

- Operation Start SolverManager.

- Quit CFX-Pre.

- OK

Save Changes Yes

cfx

R i th S lR i th S l

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Running the SolverRunning the Solver

-Start Run CFX-5 Solver.

R i th S l

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Running the Solver

CFX-5 Solver.

-

OK.

Geometr O tline

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Geometry Outline

solver manager Post CFX-Post

Run with ResultsCFX-Post*

.

- .- Object Selector Window

Wirefame,

wireframe Object Editor

.

- edge angle 0 degrees

-Apply-.

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Mesh Quality Check

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Mesh Quality Check

Minimum Face Angle

- Tools>Mesh Calculator

- Mesh Calculator,FunctionMinimum

Face Angle Calculate

Mesh Q alit Check

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Mesh Quality Check

Point

- Create>Point

- , Point 1,

OK- PointGeometry

Option Variable

Minimum

- Variable

Minimum Face Angle

- Symbol Size 2

- Color Color

Selector

- Apply

Mesh Quality Check

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Mesh Quality Check

C ti Sli Pl

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Creating a Slice Plane

- Object SelectorPoint 1

- WireframeObject EditorEdge

Angle 45 degree- Create Plane. ( Create>Plane)

- New Planenameslice

OK.- Object EditorMethod

Point and Normal.

- point(0,0,1)

- Normal (0,0,1)

C ti Sli Pl

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Creating a Slice Plane

- Object editorColour

- Mode Variable

- Variable

Temperature

- -Apply-

Creating a Legend

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Creating a Legend

- Create Legend

. (

Create>Legend)

- New Legendslice

legend OK

- object editorDefinition

slice

- -Apply-

Slice Plane

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Slice Plane

Contours

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Contours

- Contour Plot

. (

Create>Contour)- New Contourslice

contour OK

- Object EditorLocation

slice

- variableTemperature

- -Apply-

-

slice.

Contours

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Contours

Animating

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Animating

- slice contour

- slice.

- Animation icon.- Animation EditorNew Key

Frame - KeyFrameNo 1

- Object Selectorslice

(0,0,-1.99)

-Apply-

- Animation EditorNew KeyFrame - KeyFrameNo 2

Animating

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Animating

- Animation Editor

Previous Key Frame

- Animation EditorPlay

Forward

-

Stream Line

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Stream Line

- Animation Editor

- slice

- Streamline

. (

Create>Streamline)

- New Contour

Streamline-In1OK

- object editor, Geometry

tLocationIn1

- ColourMode

VariableTemperature- -Apply-

Stream Line

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Stream Line

Advanced Features

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Advanced Features

- CFX-Post.

CFX-Post

Create a User Variable

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Create a User Variable

- Tools>Variables

- Variable Editor,New icon,

- New VariableRadius OK

- Expression (X^2+Y^2)^0.5 Apply

- Variable Editor

Create an Isosurface

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- Wireframe

-

Create>Isosurface, OK

- Geometry,

Radius

-

Colour

,

Mode Variable,

Temperature

Local

Apply


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Create a Vector

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Create a Vector

- Wireframe

- Create>Vector,

OK- Geometry,

Isosurface

Velocity

ProjectionTangential

Reduction2

- Symbol Size2

Apply

Create a Vector

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Create a Vector

Plot Velocity Profile

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- Create a Plane> Wireframe

> Plane 1,

ZX PlaneY=0

color

- Create a Polyline

> Plane 1

> Create> Polyline,

OK

> Geometry

Boundary Intersection

,Boundary List out,Location

Plane 1Apply


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- Create a Chart> Create>Chart, OK

> Object Editor New Chart Line

> nameNew Line

> Locator Polyline

> X AxisX.

> Y AxisVelocity w

> OK


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- Create a Chart (Contd)

> ChartTitle

Velocity Profile atOutlet

> X Axis Label

XY Axis Label

W Velocity

>

Apply

> View

>

Chart Viewer


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Instance Transform

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Instance Transform

- Create an Instance Transform> Create>Instance Transform,

OK

> # of Copies2.

> RotationApply Rotation

> TranslationApply Translation. 6, 0, 2

Apply.

Instance Transform

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Instance Transform

- slice Plane

> Wireframe

slice

> Object Editor

Geometry

(0, 0, 1)

Apply> Render

InstancingInstance

Transform 1Apply.

>

Wireframe

Instancing

Instance Transform 1

Apply

Instance Transform

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Instance Transform

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CEL

CEL

CFX

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Slide serial no 2

2004 ANSYS CFXCFX-5.7 2004

CFX CEL - CFX Expression Language

CELCFX5

CEL

FORTRAN

CEL

CELCFX5 ()

CFX5CEL

CEL

CEL:

CEL

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CFX CEL

- )

- CEL

:

-

-

CEL*/^

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CFX

, A+ B/C

A+

B/C

1.0[mm] + 0.45[yds] (valid) 2.5[s m^-1] - (3.0[m s^-1])^-1 (valid)

1.0[mm] + 0.3[kg] (invalid)

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CFX

a^1/2 (valid)

1.0^0.5 (valid)

(a[kg m^-3] * b[m s^-1]) [kg m^-

2 s^-1]

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CFX

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CFX

:

air.density

air.viscosity

air.carbondioxide.mf - the mass fraction of carbon

dioxide in air

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CFX

CEL

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CFX

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CFX

-

-

CEL,

FORTRAN

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CFXCFX-Pre

- CCL

- Expression Editor

-

CCL

- .DEF .RES

- CCL

-

CEL

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Slide serial no 12


CFXMathematical Expression

Power-law for fluid

viscosity

where is the shearstrain rate

CEL Equivalent

K = 10.0 [kg m^-1 s^-0.5]

n = 1.5

ViscT = K * sstrnr ^ (n-1)or

ViscT = K*(min(UpperS,(sstrnr+LowerS))^(n-

1))

where sstrnr is the shear strain rate

provided as a system variable

The second form of the CEL equation above includes anThe second form of the CEL equation above includes an

upper and lower bound for strain rate to ensure it remainsupper and lower bound for strain rate to ensure it remains

physically reasonablephysically reasonable

1=

nK

Expression Editor

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CFX

Expression Editor

- CFX

- TOOLS

Expression Editor

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Slide serial no 14


CFX The following example shows how to set the viscosity to be a function

of temperature. The viscosity-temperature relation is taken as follows:

Te 10

=

CEL

(B.C.)

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CFXThe following example shows how to set angular velocity for a rotating

wall using the u and v components

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CFX

Available in solver and Post

Allow calculation of non-local integrated quantities at named locations.

Examples:- Calculate the area average of Cp on an isosurface:

areaAve(Cp)@iso1

- Mass flow of particular fluid through a locator:

oil.massFlow()@slice1 Note:

- @ syntax - must always supply a location.

- Phase/component can be selected using [.][.]

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CFXEXPRESSIONS:

ReqT = 350 [K]

TempOut = areaAve(T)@outlet

TCFilter = step(TempOut/1[K]-ReqT/1[K])

TCTemp = 400[K]*TCFilter+285[K]*(1-TCFilter)

TCFlow = 10[m/s]*TCFilter+2[m/s]*(1-TCFilter)END

[]

BOUNDARY : TempControl

Boundary Type = INLET

Location = TempControl

Coord Frame = Coord

BOUNDARY CONDITIONS :MASS AND MOMENTUM :

Option = Normal Speed

Normal Speed = TCFlow

END

HEAT TRANSFER :

Option = Static Temperature

Static Temperature = TCTemp

END

END

END

POST

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Slide serial no 18


CFXIn CFX-Post Expressions may be defined by:

using the CFX-Post Expression Editor

entered directly in an object form

entered at the commandline (using Line input mode), or theCommand Editor

read in from a CCL file

read in from a session file

read in from a state file

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CFX CFX-Post provides an additional set of functions: [.][_[_]]([])@

- area Area (projected to axis optional)

- areaAve Area-weighted average

- areaInt Area-weighted integral

- ave Arithmetic average- count Number of calculation points

- force Force on a surface in the specified direction

- forceNorm Magnitude of normalized force on a curve in the specified direction

- length Length of a curve

- lengthAve Length-weighted average

- lengthInt Length-weighted integration

- massFlow Total mass flow

- massFlowAve Mass-weighted average

- massFlowInt Mass-weighted integral

- maxVal Maximum Value

- minVal Minimum Value- probe Value at a point

- sum Sum over the calculation points

- torque Torque on a surface about the specified axis

- volume Volume of a 3-D location

- volumeAve Volume-weighted average

- volumeInt Volume-weighted integral

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CFX

CEL

Values/Expressions

Rules

System variables, functions and constant

Examples using CEL

Documents

CFX_基础教程 (1)