1. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.  CAD import  Geometry cleanup / repair  Prepare geometry according to mesh requirements  Meshing, mesh quality checks  Material, properties (i.e. thickness)  Loads, constraints (boundary conditions)  Export of FE solver deck  Analysis  Postprocessing  Loadstep(s) improvements / recommendations HyperMesh Introduction

2. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Shade geometry and activate By 2D Topo HyperMesh Introduction After geometry was imported: Remember the meaning of red edges, green edges, blue edges Import geometry: File  import

3. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Geometry topology  Topology” is how surfaces connect to adjacent surfaces of a part Surface connectivity is controlled by the associated surface edges If a surface edge is associated with more than 1 surface, those surfaces are considered to be connected (“equivalenced”) Surface edges are categorized, named, and colored according to the number of associated surfaces: Free edge (red) Associated with only 1 surface Surfaces with a free edge between them are NOT equivalenced at that edge Shared edge (green) Associated with 2 surfaces Surfaces are equivalenced Suppressed edge (blue) Surfaces are treated as though combined into 1 surface T-junction edge (yellow) Associated with 3 or more surfaces Example: surfaces forming a T-connection Surfaces are equivalenced HyperMesh Introduction

4. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. shared (=2 edges) Elements and nodes follow green edges free (edge) Elements and nodes follow red edges multiple (>=3 edges) Elements and nodes follow yellow edges suppressed (previously green edges) Elements and nodes freely move across blue edges Geometry topology HyperMesh Introduction

5. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Exercise: Geometry cleanup Question: Why do we need to improve/repair geometry? target element size 15 mm 1 mm HyperMesh Introduction

6. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. target element size 15 mm local element size 1 mm Geometry cleanup (display: element shrink) HyperMesh Introduction

7. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Geometry cleanup Question: Why do we need to improve/repair geometry? Exercise  Improve geometry  List error sources  Document working steps geom_demo.hm (raw_data.iges) HyperMesh Introduction

8. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Meshing Stopp, … something seems wrong. Gary Larson HyperMesh Introduction

9. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Geometry cleanup & meshing Exercise (geom_demo.hm)  2D meshing  List error sources  Document working steps (i.e.panels) HyperMesh Introduction

10. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Meshing, mesh quality checks After meshing change vis options of geometry from shaded to wireframe !! Shaded geometry  elements hardly visible Geometry in wireframe mode, elements shaded HyperMesh Introduction

11. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Geom  quick edit 2D  edit element 2D  automesh Where do you find the elements later? Meshing, mesh quality checks HyperMesh Introduction

12. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Check element quality Meshing, mesh quality checks Isolate „failed“ elements: Save Failed (  Elemente in User Mark) Elements off (  Model Browser) Find elements (stored in the UserMark“ add adjacent elements to selection Tool  check elements HyperMesh Introduction

13. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Check element quality Meshing, mesh quality checks „recommended“ numbers Warpage 20 Aspect 5 Skew … Min angle Quads 40 Max angle Quads 140 Min angle Tria 30 Max angle Tria 15 Length … Jacobian 0.5 Taper 0.5 / ? HyperMesh Introduction

14. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Meshing, mesh quality checks Geom  temp nodes (delete temporary nodes) 2D  replace (merge nodes) Geom  node edit HyperMesh Introduction

15. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Meshing, mesh quality checks Mesh compatibility Free edges and t-connections In case free edges or t-connections are found HM creates a component named ^edges. ^edges contains 1D elements for visualisation purposes, which help finding the problemtic spots in your model. Turn elements OFF, except those in ^edges (use model browser), add adjacent elements by using „unmask adjacent“ HyperMesh Introduction

16. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Add adjacent elements Meshing, mesh quality checks HyperMesh Introduction

17. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Meshing, mesh quality checks Tool  project Tool  translate HyperMesh Introduction

18. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Tetraeder-meshing Classical working procedure: 2 D surface mesh Check Quality Check for compatibility (edges, t-connections) HyperMesh Introduction

19. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Tetraeder-meshing select surface mesh HyperMesh Introduction