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User Manual IGG™ v8 Interactive Grid Generator - October 2007 - N U M E R I C A L M E C H A N I C S A P P L I C A T I O N S

User Manual IGG™ v8 Documentation v8a NUMECA International 5, Avenue Franklin Roosevelt 1050 Brussels Belgium Tel: +32 2 647.83.11 Fax: +32 2 647.93.98 Web: http://www.numeca.com N U M E R I C A L M E C H A N I C S A P P L I C A T I O N S

CHAPTER 1: Getting Started 1-1 What is IGG™ ? 1-2 Structure of the Manual 1-3 Installation & Settings Basic Installation Platform Compatibility Expert Display Options Graphics Driver Background & Foreground Colors 1-4 How to Start IGG™ Interface 1-5 Terms & Concepts Block Shape Control Grid Control Internal Grid Lines Internal Faces Block, Face, Edge, Segment Numbering & Active Entities Grid Generation Boundary Conditions 1-6 Visualization Geometry Grid CHAPTER 2: Graphical User Interface 2-1 Overview 2-2 GUI Description Menu Bar Toolbar Quick Access Pad Control Area Message Area Keyboard Input Area Mouse Coordinates Information Area Grid Parameters Area Viewing Buttons X, Y, and Z projection buttons Coordinate axis Scrolling 3D viewing button Rotate about x, y or z axis Zoom in/out Region zoom Fit button Original button Cutting Plane Graphics Area IGG™ Contents 1-1 1-1 1-2 1-2 1-2 1-3 1-3 1-3 1-3 1-4 1-4 1-5 1-7 1-8 1-8 1-9 1-10 1-12 1-13 1-13 1-13 2-1 2-1 2-2 2-2 2-3 2-4 2-5 2-5 2-6 2-6 2-6 2-6 2-7 2-7 2-7 2-8 2-8 2-8 2-8 2-9 2-9 2-9 2-9 2-9 iii

Contents 2-3 GUI Interaction Keyboard Shortcuts Default Mouse Bindings CHAPTER 3: Meshing Fundamentals 3-1 Introduction 3-2 Basic Block Creation Creating block defined by two opposite vertices Creating a block by its eight vertices Creating a block by extrusion from an existing block Creating blocks by duplication of existing block(s) Block extension 3-3 Block Mapping Moving vertex Adding/deleting vertices Vertex snapping Vertex locking Edge mapping Edge mapping onto disjointed curves Edge mapping on surface Faster vertex movement 3-4 Edge Grid Control Fixed point control Segment control 3-5 Face Generation Face generation by bilinear interpolation Face projection Mapping onto a surface Finer control on the face generation Face generation history & face regeneration History visualization Face regeneration 3-6 Block Generation 3-7 Internal Edges & Faces Internal edges Internal faces 3-8 Defining Patches & Boundary Conditions 3-9 Connections Patch connections Matching & non matching connections Full non matching connections Topological connections (vertex, edge, segment) Vertex connection Orphan vertex connection Topological edge connection Segment connection 2-10 2-10 2-13 3-1 3-1 3-2 3-2 3-3 3-4 3-5 3-6 3-7 3-7 3-8 3-9 3-10 3-10 3-11 3-12 3-12 3-13 3-14 3-16 3-18 3-18 3-19 3-20 3-21 3-22 3-22 3-23 3-23 3-24 3-24 3-25 3-27 3-29 3-29 3-29 3-32 3-33 3-33 3-34 3-35 3-36 iv IGG™

Connection tools Connecting face grids Full non matching connections Disconnecting entities Visualizing connections 3-10 Blocks Grouping Block groups usage Managing groups CHAPTER 4: Butterfly mesh 4-1 Introduction 4-2 Butterfly Implementation Terminology Generation method Butterfly shape control 4-3 Butterfly Dialog Box General variables frame Preferential direction Buffer blocks Creation from uniform clustering Section control frame Section number ID Preferential direction buffer depth Radial depth Straight radial edges Control points parameters Section interactive control Clustering frame Number of radial points Radial clustering Clustering reciprocity Butterfly command buttons 4-4 Butterfly Management Creation specificities Blocks naming and numbering Interaction with the butterfly topology Forbidden operations Visualization of butterfly blocks inner mesh Cells volume calculation Grid quality checking Butterfly regeneration when using template Block transformation Block duplication Imposition of an initial solution in FINE™ Current limitations IGG™ Contents 3-36 3-36 3-37 3-39 3-39 3-40 3-41 3-41 4-1 4-1 4-2 4-2 4-3 4-4 4-7 4-8 4-8 4-9 4-9 4-10 4-10 4-10 4-11 4-12 4-12 4-13 4-13 4-13 4-14 4-14 4-15 4-16 4-16 4-17 4-18 4-19 4-20 4-20 4-21 4-21 4-22 4-22 4-22 4-23 v

Contents CHAPTER 5: Templates & Scripts 5-1 Introduction 5-2 Templates Introduction Fundamental Assumptions Using Template Option Analyze Input Geometry Create Template Project Geometry Options Grid Options Vertex Positioning Replay Template on Modified Geometry Troubleshooting Input file format 5-3 Scripts Introduction Language Overview Adding Commented Lines Support for Mathematical Operations String Handling Lists Handling Control Flow Function Definition File Handling Error Handling Create & Use Modules (library of functions) Running Script File IGG™ Script Commands Project Commands Geometry Commands Global Functions Point & Vector Classes Range Class IJKRange Class Box Class Curve Class Surface Class GeomGroup Class Topology & Grid Classes Commands Global Functions Block Class Face Class Patch Class Edge Class TEdge Class Segment Class Vertex Class FixedPoint Class 5-1 5-1 5-2 5-2 5-2 5-3 5-3 5-3 5-3 5-4 5-4 5-4 5-5 5-5 5-6 5-6 5-6 5-6 5-6 5-7 5-7 5-8 5-8 5-9 5-9 5-9 5-10 5-10 5-11 5-11 5-12 5-13 5-14 5-14 5-15 5-15 5-19 5-20 5-21 5-21 5-21 5-27 5-29 5-30 5-32 5-32 5-33 5-34 vi IGG™

Examples Topology Placement ClusteringGroup Class BlockGroup Class Connection Commands Quality Checking Commands MultiStage Module Basic Geometry Operations Pipe-to-Pipe Mesh Generation Full Automatic Regeneration MultiStage Module Example 1 Example 2 Export PLOT3D Format 5-4 Templates vs. Scripts CHAPTER 6: Quick Access Pad 6-1 Overview 6-2 Geometry Subpad Description Point page Cartesian Point Curve-Curve Inters Curve-Plane Inters Curve-Surface Inters Curve page Polyline CSpline Arc Trim Group UnGroup Surf-Surf Inters Surf-Plane Inters Set Name Surface page Lofted Revolution Coons Linear Sweep Offset From Face Grid Set Name Edit page Copy Mirror Translate Rotate IGG™ Contents 5-34 5-35 5-36 5-36 5-38 5-39 5-40 5-41 5-42 5-44 5-45 5-45 5-46 5-46 5-48 6-1 6-1 6-2 6-2 6-2 6-2 6-2 6-2 6-3 6-3 6-3 6-3 6-3 6-3 6-3 6-3 6-3 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-4 6-5 6-5 6-5 vii

Contents Scale 6-3 Grid Subpad Description Create page Insert New Block Insert New Block by picking vertices Insert New Face Extrude Range Duplicate Block Block by Sweeping Block by Face Translation Block by Face Expansion Block by Face Rotation Create Butterfly Delete Block(s) Create Internal Block Refine Block Insert/Edit page Insert Vertex Insert Fixed Point Insert Internal Grid Line Internal Point Internal Face Cluster Points Transform Blocks Extend Block Split Block Split Block at internal faces Merge Blocks Edge - Edge Face - Face Whole grid Show Vertex Connections Show Edge Connections Show Segment Connections Show Face Connections Connect page Generate page 2 Bnd Interpolation 4 Bnd Interpolation Face Generation Tool Project Face Block 6 Bnd Regenerate Faces Show History 6-4 View Subpad Description Geometry Groups page Block Groups page Grid Configuration page 6-5 6-5 6-5 6-5 6-6 6-8 6-8 6-11 6-13 6-13 6-13 6-13 6-13 6-13 6-14 6-14 6-15 6-15 6-15 6-15 6-15 6-16 6-16 6-16 6-17 6-18 6-18 6-18 6-18 6-19 6-20 6-20 6-21 6-21 6-21 6-21 6-22 6-22 6-22 6-22 6-22 6-24 6-24 6-25 6-26 6-26 6-27 6-29 viii IGG™

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