v.16.2.1 ANSA v.16.2.1 ANSA for CFD Brief User Guide Table of Contents 1. Introduction............................................................................................................................................ 5 1.1. CFD layout...................................................................................................................................... 6 1.2. How to get help about ANSA?.........................................................................................................7 1.3. Customizing ANSA..........................................................................................................................8 1.4. Basic terminology............................................................................................................................9 1.5. View Control................................................................................................................................. 10 1.6. Detail on Demand effect...............................................................................................................11 1.7. Most important key actions...........................................................................................................11 1.8. Making Selections........................................................................................................................ 12 1.9. TOPO menu................................................................................................................................. 13 1.10. MESH menu............................................................................................................................... 14 1.11. DECK menu................................................................................................................................ 15 1.12. MORPH menu............................................................................................................................ 16 1.13. HEXABLOCK menu....................................................................................................................17 2. Geometry Preparation......................................................................................................................... 18 2.1. Data Input...................................................................................................................................... 18 2.2. Resolution and Tolerances............................................................................................................19 2.3. Effect of tolerances on CAD operations.........................................................................................20 2.4. Geometry Clean up....................................................................................................................... 22 2.5. Wetted surface extraction for thin parts.........................................................................................24 2.6. Wetted surface extraction for bulk parts or assemblies.................................................................25 2.7. Watertight preparation...................................................................................................................26 2.8. Checking for intersections and proximities at Geometry level.......................................................26 2.9. Creation of sub-volumes................................................................................................................26 2.10. Model organization through the Model Browser (Part Manager).................................................27 2.11. Detection of Baffles.....................................................................................................................28 2.12. Link Geometry............................................................................................................................. 29 2.13. Treating Surfaces........................................................................................................................ 30 3. Surface Meshing................................................................................................................................... 31 3.1. Simplifying Macros........................................................................................................................ 31 3.2. Uniform size mesh......................................................................................................................... 32 3.3. Variable feature dependent size mesh (CFD mesh)......................................................................32 3.4. Notes on CFD meshing.................................................................................................................33 3.5. STL like mesh................................................................................................................................ 36 3.6. Summary of Automatic Quality Improvement functions.................................................................37 3.7. Useful Checks............................................................................................................................... 39 4. Watertight model preparation...............................................................................................................40 4.1. Intersecting meshed parts.............................................................................................................40 4.2. Surface wrapping approach...........................................................................................................41 4.3. Preparation for wrapping...............................................................................................................42 4.4. Constant length surface wrapping.................................................................................................43 4.5. Variable length surface wrapping..................................................................................................44 4.6. Post-wrap checks.......................................................................................................................... 45 5. Identifying leaks.................................................................................................................................... 46 6. Layers.................................................................................................................................................. 48 7. Volume Meshing.................................................................................................................................. 52 7.1. Manual Volume Definition..............................................................................................................52 7.2. Auto Detect functionality for Volume Definition..............................................................................52 7.3. Meshing the Volume...................................................................................................................... 52 7.4. Semi-structured volume mesh.......................................................................................................54 7.5. Checking the Volume quality and fixing.........................................................................................54 BETA CAE Systems S.A. 2 ANSA v.16.2.1 ANSA for CFD Brief User Guide 8. Batch Meshing...................................................................................................................................... 55 8.1. Setting up Batch Mesh sessions....................................................................................................56 9. Hexablock Meshing............................................................................................................................. 57 10. CFD solver I/O formats...................................................................................................................... 60 10.1. Definition of periodic boundary conditions...................................................................................62 11. Model generation Checklist................................................................................................................63 12. Recommendations for OpenFOAM model setup...............................................................................65 12.1. Setting up the quality criteria limits..............................................................................................65 12.2. Surface meshing.......................................................................................................................... 65 12.3. Layers generation........................................................................................................................ 66 12.4. Final Volume mesh improvement................................................................................................67 12.5. Setting up Boundary Conditions..................................................................................................68 12.6. Solver setup................................................................................................................................. 69 12.7. Running the case......................................................................................................................... 69 13. Importing CFD results in ANSA.........................................................................................................70 13.1. Importing results from the same