Ansys Modeling And Meshing Guide.pdf

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Ansys Modeling And Meshing Guide

Transcript of Ansys Modeling And Meshing Guide.pdf

ANSYS Modeling and Meshing GuideANSYS Release 9.0

002114 November 2004

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

ANSYS Modeling and Meshing GuideANSYS Release 9.0

ANSYS, Inc. Southpointe 275 Technology Drive Canonsburg, PA 15317 ansysinfo@ansys.com http://www.ansys.com (T) 724-746-3304 (F) 724-514-9494

Copyright and Trademark InformationCopyright 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 respective 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. This ANSYS, Inc. software product and program documentation is ANSYS Confidential Information and are furnished by ANSYS, Inc. under an ANSYS software license agreement that contains provisions concerning non-disclosure, copying, length and nature of use, warranties, disclaimers and remedies, and other provisions. The Program and Documentation may be used or copied only in accordance with the terms of that license agreement. See the ANSYS, Inc. online documentation or the ANSYS, Inc. documentation CD for the complete Legal Notice. If this is a copy of a document published by and reproduced with the permission of ANSYS, Inc., it might not reflect the organization or physical appearance of the original. ANSYS, Inc. is not liable for any errors or omissions introduced by the copying process. Such errors are the responsibility of the party providing the copy.

Table of Contents1. Overview of Model Generation ........................................................................................................... 11 1.1. What Is Model Generation? ........................................................................................................... 11 1.2. Typical Steps Involved in Model Generation Within ANSYS ............................................................ 11 1.2.1. Comparing Solid Modeling and Direct Generation ................................................................ 12 1.2.1.1. Solid Modeling ............................................................................................................ 12 1.2.1.2. Direct Generation ........................................................................................................ 13 1.3. Importing Solid Models Created in CAD systems ............................................................................ 13 2. Planning Your Approach ..................................................................................................................... 21 2.1. The Importance of Planning .......................................................................................................... 21 2.2. Determine Your Objectives ........................................................................................................... 21 2.3. Choose a Model Type (2-D, 3-D, etc.) ............................................................................................. 21 2.4. Choose Between Linear and Higher Order Elements ...................................................................... 21 2.4.1. Linear Elements (No Midside Nodes) ..................................................................................... 22 2.4.2. Quadratic Elements (Midside Nodes) .................................................................................... 23 2.5. Limitations on Joining Different Elements ..................................................................................... 26 2.6. Find Ways to Take Advantage of Symmetry ................................................................................... 26 2.6.1. Some Comments on Axisymmetric Structures ....................................................................... 27 2.6.1.1. Some Special Requirements for Axisymmetric Models .................................................. 27 2.6.1.2. Some Further Hints and Restrictions ............................................................................ 28 2.7. Decide How Much Detail to Include .............................................................................................. 28 2.8. Determine the Appropriate Mesh Density ..................................................................................... 28 3. Coordinate Systems ............................................................................................................................ 31 3.1. Types of Coordinate Systems ........................................................................................................ 31 3.2. Global and Local Coordinate Systems ............................................................................................ 31 3.2.1. Global Coordinate Systems .................................................................................................. 31 3.2.2. Local Coordinate Systems .................................................................................................... 32 3.2.3. The Active Coordinate System .............................................................................................. 34 3.2.4. Surfaces ............................................................................................................................... 35 3.2.5. Closed Surfaces and Surface Singularities ............................................................................. 36 3.3. Display Coordinate System ........................................................................................................... 37 3.4. Nodal Coordinate Systems ............................................................................................................ 38 3.4.1. Data Interpreted in the Nodal Coordinate System ................................................................. 38 3.5. Element Coordinate Systems ........................................................................................................ 39 3.6. The Results Coordinate System ..................................................................................................... 39 4. Using Working Planes ......................................................................................................................... 41 4.1. What Is a Working Plane? .............................................................................................................. 41 4.2. Creating a Working Plane .............................................................................................................. 41 4.2.1. Defining a New Working Plane ............................................................................................. 42 4.2.2. Controlling the Display and Style of the Working Plane ......................................................... 42 4.2.3. Moving the Working Plane ................................................................................................... 42 4.2.4. Rotating the Working Plane .................................................................................................. 43 4.2.5. Recreating a Previously-defined Working Plane .................................................................... 43 4.3. Working Plane Enhancements ....................................................................................................... 43 4.3.1. Snap Increment ................................................................................................................... 43 4.3.2. Display Grid ......................................................................................................................... 44 4.3.3. Retrieval Tolerance ............................................................................................................... 44 4.3.4. Coordinate Type .................................................................................................................. 44 4.3.5. Working Plane Tracking ........................................................................................................ 45 5. Solid Modeling .................................................................................................................................... 51 5.1. An Overview of Solid Modeling Operations ................................................................................... 51ANSYS Modeling and Meshing Guide . ANSYS Release 9.0 . 002114 . SAS IP, Inc.

ANSYS Modeling and Meshing Guide 5.2. Creating Your Solid Model from the Bottom Up ............................................................................. 55 5.2.1. Keypoints ............................................................................................................................ 56 5.2.2. Hard Points .......................................................................................................................... 58 5.2.3. Lines ................................................................................................