ansa_for_cfd_quick_start_guide.pdf
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ANSA for CFD Quick Start Guide
Table of Contents
1. Introduction............................................................................................................................................5
1.1. Customizing ANSA..........................................................................................................................7
1.2. Basic terminology............................................................................................................................8
1.3. View Control...................................................................................................................................9
1.4. Detail on Demand effect...............................................................................................................10
1.5. Most important key actions...........................................................................................................10
1.6. Making Selections........................................................................................................................11
1.7. TOPO menu.................................................................................................................................12
1.8. MESH menu.................................................................................................................................13
1.9. DECK menu..................................................................................................................................14
1.10. MORPH menu............................................................................................................................15
1.11. HEXABLOCK menu....................................................................................................................16
2. Geometry Preparation.........................................................................................................................17
2.1. Data Input......................................................................................................................................17
2.2. Resolution and Tolerances............................................................................................................17
2.3. Geometry Clean up.......................................................................................................................18
2.4. Outer or middle surface extraction.................................................................................................19
2.5. Watertight preparation...................................................................................................................20
2.6. Checking for intersections and proximities at Geometry level.......................................................20
2.7. Creation of sub-volumes................................................................................................................20
2.8. Model organization........................................................................................................................21
2.9. Detection of Baffles.......................................................................................................................22
2.10. Link Geometry.............................................................................................................................23
2.11. Treating Surfaces........................................................................................................................24
3. Surface Meshing...................................................................................................................................25
3.1. Simplifying Macros........................................................................................................................25
3.2. Uniform size mesh.........................................................................................................................26
3.3. Variable feature dependent size mesh..........................................................................................26
3.4. STL like mesh................................................................................................................................30
3.5. Summary of Automatic Quality Improvement functions.................................................................31
3.6. Useful Checks...............................................................................................................................32
4. Layers..................................................................................................................................................33
5. Surface Wrapping................................................................................................................................35
5.1. Variable size wrapping..................................................................................................................36
5.2. Preparation for wrapping...............................................................................................................37
5.3. Post-wrap checks..........................................................................................................................37
6. Identifying leaks...................................................................................................................................38
6.1. Leak check on dirty meshes for wrapping.....................................................................................38
6.2. Leak check on good quality shell mesh.........................................................................................40
7. Volume Meshing..................................................................................................................................41
7.1. Manual Volume Definition..............................................................................................................41
7.2. DETECT functionality for Volume Definition..................................................................................41
7.3. Meshing the Volume......................................................................................................................42
7.4. Checking the Volume quality and fixing.........................................................................................43
8. Batch Meshing.....................................................................................................................................43
9. CFD interfaces.....................................................................................................................................44
10. Model generation Checklist................................................................................................................46
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ANSA for CFD Quick Start Guide
11. Morphing for CFD..............................................................................................................................48
11.1. Box Morphing Approach..............................................................................................................48
11.2. BOX preparation..........................................................................................................................49
11.3. Box shape issues........................................................................................................................51
11.4. Box boundaries ...........................................................................................................................51
11.5. Larger Boxes maintain orthogonality...........................................................................................52
11.6. Large Boxes result in smaller deformations of the volume mesh.................................................52
11.7. Tangency condition.....................................................................................................................53
11.8. Additional User Tangency condition............................................................................................54
11.9. Tolerances...................................................................................................................................55
11.10. Edge fitting on features of the model.........................................................................................55
11.11. Troubleshooting morphing boxes..............................................................................................57
11.12. Direct Morphing (without morphing boxes)................................................................................58
11.13. Define MORPH Parameters......................................................................................................59
11.14. The Deformation Morph Parameter...........................................................................................59
11.15. Morph the geometry through deformation mapping...................................................................60
11.16. Part Manager structure..............................................................................................................62
12. User Defined Functions for CFD models...........................................................................................63
COPYRIGHT 1990-2012 BETA CAE SYSTEMS S.A.
ALL RIGHTS RESERVED.
BETA CAE Systems S.A.
Kato Scholari, Thessaloniki,
GR-57500 Epanomi,
Greece
Tel: +30-2392 021420
+30 2311 993300
Fax: +30-2392 021828
E-mail: ansa@beta-cae.gr
URL: http://www.beta-cae.gr
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ANSA for CFD Quick Start Guide
1. Introduction
This document is a compressed summary of ANSA's functionality for CFD and describes some important
steps/points that are useful for the creation of a CFD model. As CFD models tend to increase in size,
ensure that you are using the 64bit version of the code to take full advantage of all your hardware’s
memory. Start ANSA as follows:
/<installation_path>/ansa_v13.2.2/ansa64.sh
for Linux, or
./ansa64.bat
for Windows
This will open the ANSA launcher window:
Startup mode selection
Option to start a new custom user defined
mode based on the above selected one
Specification of additional start up
arguments and commands (press
the ? button to list them)
Option to skip the launcher and always
start with the current options
Select the CFD mode and press OK. The CFD mode of ANSA is customized with respect to the interface
and also the actual functionality (mesh parameters, quality criteria etc) so that it performs best for CFD
pre-processing tasks. It is therefore highly recommended to use this mode of ANSA for your work.
Note: if the launcher does not appear (due to special installation issues in your company)
you can impose directly the start-up of ANSA in CFD mode by adding the argument
-gui CFD
, for
example in Linux:
/<installation_path>/ansa_v13.2.2/ansa64.sh -gui CFD
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ANSA for CFD Quick Start Guide
This will ensure that ANSA starts with a default interface tuned for CFD preprocessing, as shown below:
2. Access to:
-Batch mesh
-Part Manager
-PID list
-SET list
-Database browser
-Mesh Parameters
-Quality Criteria
-Measure tool
-Settings
1. Access to Help
3. MENU
buttons
Group Name
4. Group of
Functions
5. Options
window
7. Geometry and
D.UTIL Groups
6. View
modes
8. FOCUS
commands
9.Message line and
ANSA Info window
Note that this customization does not refer only to the interface and button positions, but also to all tuning
parameters that affect the algorithms and performance of the software for the common CFD tasks!
1.
Access to Help: html Online-Help and all PDF documentation.
2.
Access to:
Batch Mesh
for meshing automation
Part Manager
for model organization through Groups, sub-assemblies and Parts
PIDs
for management of Properties of the model
SETs
for managemrnt of SET (groups of ANSA entities like elements, properties, Faces etc)
Database Browser
for access to the contents of the Database and Filters for model management
Mesh Parameters
for controlling the meshing algorithms and quality improvement
Quality Criteria
for setting quality criteria and threshold values and settings Presentation
Parameters
Measure
tool to make measurements of the model
Settings
for settings and customization for Functionality and GUI, correspondingly saved in
CFD.defaults and CFD.xml files in your home directory under
<homedir>
/.BETA/ANSA/version_v13.2.2/
3.
Switch between the main menus of
TOPO
for geometry creation, manipulation, cleanup and watertight preparation
MESH
for surface and volume mesh and fix
DECK
for solver related features and the creation of Size Boxes for controlling mesh size
MORPH
for mesh and geometry morphing
HEXABLOCK
for hexa meshing based on block structure of boxes
4.
The functions are arranged in Groups, depending on the Entity that they are applicable to. Some
additional functions that may exist in the buffer menu (hidden) can be accessed by clicking on the Group
Name with the left mouse button.
5.
The Options window displays all the settings of the currently Active function.
6.
These flag buttons control the visibility mode of the model, in the form of flags or toggle buttons like
coloring the model in ENT (Entity) or PID (Property ID), or SHADOW or WIRE mode etc. In addition, there
are visibility flag buttons for different Entities.
7.
Access to Transformations (translate, copy, move etc), model Checks and Information.
8.
The FOCUS group contains all the functions that are used to isolate and control the visibility of
selected entities in order to obtain a clear image of the working area of the model.
9.
Instructions and reporting of the program are printed in the message line and the ANSA info window.
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