ANSYS CFX-Mesh Tutorials phần 1 pptx

Note that if you create the mesh by following the instructions given in these examples, you may not be able to set up the physics in CFX-5 by using the CFX-Pre session file without getti

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ANSYS CFX-Mesh Tutorials

ANSYS Workbench Release 9.0

November 2004

ANSYS, Inc is a

UL registered

ISO 9001: 2000

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Table of Contents

Introduction to the CFX-Mesh Tutorials 1

1 List of Features 4

2 Legal Notices 5

Tutorial 1: Static Mixer 9

1 Introduction to CFX-Mesh 9

2 Geometry Creation 10

3 Mesh Generation 20

Tutorial 2: Static Mixer (Refined Mesh) 27

1 Modifying the Mesh Generation 27

2 Geometry Modification 30

3 Updating the Geometry in CFX-Mesh 32

Tutorial 3: Process Injection Mixing Pipe 35

Tutorial 4: Circular Vent 43

Tutorial 5: Blunt Body 49

Tutorial 6: Butterfly Valve 61

Tutorial 7: Catalytic Converter 71

Tutorial 8: Annulus 81

Tutorial 9: Mixing Tube 87

Tutorial 10: Heating Coil 93

Tutorial 11: Airlift Reactor 103

Tutorial 12: Room with Air Conditioning 113

Tutorial 13: Can Combustor 121

1 Geometry Import 122

Tutorial 14: CAD Cleanup and Meshing 127

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Introduction to the CFX-Mesh Tutorials

The CFX-Mesh Tutorials are a set of tutorial examples which demonstrate how to set up the geometry and mesh for a variety of different problems The tutorials cover most of the meshing functionality available in CFX-Mesh together with some of the most commonly-used geometry features from DesignModeler Each example results

in the creation of CFX-5 GTM file, which can be imported directly into CFX-Pre You will find instructions for setting

up CFD simulations using these meshes in the 5 Tutorials which are part of the main on-line help for CFX-5

A few of these tutorials require the use of Parasolid or DesignModeler files as a starting point for the geometry creation Where such a file is required, the introduction to the tutorial explains this If you have not already obtained these files, they should be readily available from the CFX Community Website: go to http://www-waterloo.an-sys.com/cfxcommunity This site is available to all registered CFX users If you have not already got a username and password, go to http://www-waterloo.ansys.com/cfx/community/apply.htm to apply

These tutorial instructions are based on ANSYS Workbench 9.0 Some of the tutorials will not work in earlier versions of ANSYS Workbench since they rely on new features, and other tutorials may be hard to follow If you still have ANSYS Workbench 8.1 then you can find tutorial instructions explicitly for this version on the CFX Community Website using the following link: http://www-waterloo.ansys.com/cfxcommunity/technotes/docu-mentation/CFX-Mesh_8.1/index.html

If you want to print out the tutorials, then we recommend that you follow the link to the CFX Community Website

to download a package in pdf format, and use this for printing

Note that if you create the mesh by following the instructions given in these examples, you may not be able to set up the physics in CFX-5 by using the CFX-Pre session file without getting errors which you need to fix up after the session file has finished playing You can always follow the CFX-5 tutorial instructions manually instead This

is because the CFX-Pre session files are set up to use the mesh files provided with CFX-5, and some face and body identifications are different to the ones which you would get by creating meshes by following these instructions

In most cases, you can use the CFX-Pre session file to set up the physics, and then manually apply the location

of the domain and any sub-domains if required In addition, in the Combustor tutorial, you will also need to set

up the “Vane Surfaces” location manually, and in the Catalytic Converter tutorial, you may need to delete and recreate the two Domain Interfaces manually

Can I Skip the Geometry Creation?

If you are only interested in the meshing parts of the tutorials and want to skip all of the geometry creation, then

you should follow the link to the CFX Community Website above to download the DesignModeler agdb files

for the tutorials of interest You can then use these for each tutorial as follows:

by the tutorial

2

ap-propriate agdb in the file browser which opens up.

the beginning of the Mesh Generation section, ignoring the instructions on opening CFX-Mesh

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What if I Don't Have DesignModeler?

If you don't have DesignModeler or don't have a license to run DesignModeler, then you can still work through the meshing parts of these tutorials as follows:

files for the tutorials of interest

following the instructions below

CAD package, then import the Parasolid files into that CAD package, and then use the resulting CAD files

in CFX-Mesh by following the instructions below

representative to obtain a set of geometry files that you can import

The instructions for importing the relevant CAD files (Parasolid or otherwise) into CFX-Mesh are as follows:

by the tutorial

2

ap-propriate CAD filename in the file browser which opens up

the beginning of the Mesh Generation section, ignoring the instructions on opening CFX-Mesh

If you import the Parasolid files into your CAD package and then import the resulting CAD file into CFX-Mesh you may occasionally find that whilst the geometry still looks the same afterwards, certain features may change subtly due to differences in the geometry representation in your CAD package

Specific tutorials will need minor adaptations as a result of importing Parasolid files (or other CAD files) directly:

point at which you write the file StaticMixerRefMesh.gtm as this relies on being able to modify the

geometry in DesignModeler It is recommended that you read through the section called “Updating the Geometry in CFX-Mesh” if you want to see how to update your geometry in CFX-Mesh, as this is not covered by any other tutorial

instructions expect the geometry to be in millimeters You will need to enter all given values in the correct units of meters i.e when the tutorial asks you to set a Default Body Spacing of 4.5 mm, you must enter 0.0045 m

tutorial instructions expect the geometry to be in centimeters You will need to enter all given values in the correct units of meters i.e when the tutorial asks you to set a Default Body Spacing of 1.0 cm, you must enter 0.01 m

• Tutorial 8: Annulus - The units after you import the Parasolid file are always meters, but the tutorial instruc-tions expect the geometry to be in feet You will need to enter all given values in the correct units of meters i.e when the tutorial asks you to set a Default Body Spacing of 0.02 ft, you must enter 0.006 m Conversions for the other values are given in the tutorial instructions

Introduction to the CFX-Mesh Tutorials

CFX-Mesh Tutorials © SAS IP, Inc.

2

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• Tutorial 9: Mixing Tube - The units after you import the Parasolid file are always meters, but the tutorial instructions expect the geometry to be in millimeters You will need to enter all given values in the correct units of meters i.e when the tutorial asks you to set a Default Body Spacing of 0.6 mm, you must enter 0.0006 m

– The DesignModeler geometry puts both solid bodies into one part and creates shared faces between them, so that CFX-Mesh can create one mesh containing both bodies The result of the direct Parasolid

import will be to have two bodies each in a separate part, so CFX-Mesh will create one file

Heating-CoilMesh.gtm which contains two separate meshes, and hence two separate assemblies in CFX-Pre.

This file can be used in CFX-Pre as usual; an example of how to deal with having multiple assemblies

in CFX-Pre is detailed in the CFX-5 example “Tutorial 10: Flow in a Catalytic Converter” (although you must use Fluid-Solid Interfaces for this example since you are connecting a fluid domain to a solid domain)

– You are advised that if you wish to work through the CFX-5 example after creating your mesh, you

should use the CFX-Pre Mesh file HeatingCoilMesh.gtm provided by your CFX-5 installation, since

the tutorial instructions were written expecting one mesh containing both bodies

– In addition, since you have two separate parts in the CFX-Mesh session, you should NOT enable Surface Proximity as suggested by the tutorial instructions: if surface proximity is enabled on a multi-part geometry, then the mesher sees the faces in each part as being very close together but not coincident, and so attempts to refine the mesh in this region far more than is required for this tutorial

– The tutorial instructions ask you to suppress one of the Bodies contained in Part 3 Instead, you should click on the name of each part in turn, and see which one corresponds to the coil and which one to

the container Then right-click over the part which corresponds to the coil, and select Suppress Later,

in order to see which 2D Regions you have selected, suppress the other part in the same way

After-wards, unsuppress both parts by right-clicking on their names and selecting Unsuppress.

– The units after you import the Parasolid file are always meters, but the tutorial instructions expect the geometry to be in centimeters You will need to enter all given values in the correct units of meters i.e when the tutorial asks you to set a Default Body Spacing of 1.0 cm, you must enter 0.01 m – The DesignModeler geometry puts both solid bodies into one part and creates shared faces between them, so that CFX-Mesh can create one mesh containing both bodies The result of the direct Parasolid

import will be to have two bodies each in a separate part, so CFX-Mesh will create one file

Bubble-ColumnMesh.gtm which contains two separate meshes, and hence two separate assemblies in

CFX-Pre This file can be used in CFX-Pre as usual; an example of how to deal with having multiple assemblies

in CFX-Pre is detailed in the CFX-5 example “Tutorial 10: Flow in a Catalytic Converter”

– You are advised that if you wish to work through the CFX-5 example after creating your mesh, you

should use the CFX-Pre Mesh file BubbleColumnMesh.gtm provided by your CFX-5 installation, since

the tutorial instructions were written expecting one mesh containing both bodies

– When you create the Composite 2D Region DraftTube, you may find that the selection rectangles

appear in the order (from left to right): outside of the column, draft tube face (inside), draft tube face (outside), face from symmetry plane, instead of the order listed in the tutorial instructions You can tell which order they appear in, since the selection rectangle corresponding to the draft tube (outside) will be the same color as the outside of the column This is the one which you require

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The units after you import the Parasolid file are always meters, but the tutorial instructions expect the geometry to be in centimeters You will need to enter all given values in the correct units of meters i.e when the tutorial asks you to set a Default Body Spacing of 1.6 cm, you must enter 0.016 m –

– The DesignModeler geometry puts all five solid bodies into one part and creates shared faces between them, so that CFX-Mesh can create one mesh containing all of the bodies The result of the direct Parasolid import will be to have five bodies each in a separate part, so CFX-Mesh will create one file

CombustorMesh.gtm which contains five separate meshes, and hence five separate assemblies in

CFX-Pre This file can be used in CFX-Pre as usual; an example of how to deal with having multiple as-semblies in CFX-Pre is detailed in the CFX-5 example “Tutorial 10: Flow in a Catalytic Converter” – You are advised that if you wish to work through the CFX-5 example after creating your mesh, you

should use the CFX-Pre Mesh file CombustorMesh.gtm provided by your CFX-5 installation, since

the tutorial instructions were written expecting one mesh containing all of the bodies

1 List of Features

The following table shows you which geometry features are covered in which tutorial

14 13 12 11 10 9 8 7 6 5 4 3 2 1

Sketching Mode

•

• Draw Toolbox

•

• Modify Toolbox

•

• Dimensions Toolbox

•

• Constraints Toolbox

•

• Settings Toolbox

3D Features

•

• Extrude

•

• Revolve

•

• Sweep

• Skin/Loft

Other Features

•

• Parasolid Import

•

• Multiple Bodies

•

• Freeze/Unfreeze/Add Frozena

•

• Body Operationsb

•

• Plane Creation from Facesc

•

• Imprint Facesd

• Enclosure

a Freeze/Unfreeze/Add Frozen: for multiple bodies and for creating bodies which enclose another body

b Body Operations: for copying, moving, and subtracting bodies from other bodies

c Plane Creation from Faces: for 3D Feature operations on existing surfaces

d Imprint Faces: for Boundary Condition Surfaces

The following table shows you which meshing features are covered in which tutorial

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14 13 12 11 10 9 8 7 6 5 4 3 2 1

•

• 2D Region Groups

•

• Face Spacinga

•

• Curvature-Sensitive Meshing

• Controlsb

• Periodicity

•

• Inflationc

• Stretch

•

• Proximityd

•

• Preview Groupse

• Extruded 2D Meshing

Parallel Volume Meshing

• Geometry Update

• CAD Check

• Virtual Faces and Edges

• Short Edge Removal

a Face Spacing: for refining the mesh on a particular face or faces

b Controls: for refining the mesh near a point, line or triangle

c Inflation: for producing prism elements along a boundary in order to resolve the boundary better

d Proximity: for refining the mesh when two faces or two edges are close but not joined

e Preview Groups: for previewing part or all of the surface mesh

2 Legal Notices

Copyright and Trademark Information

Copyright © 2004 SAS IP, Inc All rights reserved Unauthorized use, distribution or duplication is prohibited ANSYS, DesignSpace, CFX, DesignModeler, DesignXplorer, ANSYS Workbench environment, AI*Environment, CADOE and any and all ANSYS, Inc product names referenced on any media, manual or the like, are registered trademarks or trademarks of subsidiaries of ANSYS, Inc located in the United States or other countries ICEM CFD

is a trademark licensed by ANSYS, Inc All other trademarks and registered trademarks are property of their re-spective owners

ANSYS, Inc is a UL registered ISO 9001: 2000 Company

ANSYS Inc products may contain U.S Patent No 6,055,541

Microsoft, Windows, Windows 2000 and Windows XP are registered trademarks of Microsoft Corporation Inventor and Mechanical Desktop are registered trademarks of Autodesk, Inc

SolidWorks is a registered trademark of SolidWorks Corporation

Pro/ENGINEER is a registered trademark of Parametric Technology Corporation

Unigraphics, Solid Edge and Parasolid are registered trademarks of Electronic Data Systems Corporation (EDS) ACIS and ACIS Geometric Modeler are registered trademarks of Spatial Technology, Inc

FLEXlm License Manager is a trademark of Macrovision Corporation

Section 2: Legal Notices

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