1. DEMPack Discrete / finite elements simulation software
Barcelona, April 2010
International Center for Numerical Methods in Engineering (CIMNE) Barcelona, Spain

2. Outline Software philosophy Simulation technology User interface – GiD
Full access toolbar
Wizards
Comments
TO-DO list

3. Software philosophy 2 level of users GiD based pre/post process
Beginner : Guided access on different analysis types (wizards)
Market  Industry
Advanced : Full access possibility
Market  Academic and research
GiD based pre/post process
Full DEM support (generation, mesh analysis, visualization)

4. Simulation technology
Discrete element method
Cylindrical (2D) and Spherical (3D) elements
Different contact models
Linear and non-linear
Cohesive bonds
Wear
Explicit finite element method
2D: Triangle / quadrilateral
3D: Tetrahedral / Hexahedra
Shell (BST)
DEM / FEM coupling

5. User Interface - GiD Interface based in GiD 10.0 2 type access
Beginners: wizards
Silos 2D / 3D
Mills 2D / 3D
Rock laboratory tests
Rock cutting 2D / 3D
DEM/FEM coupling 2D / 3D
Advanced: access via Toolbar
Access to all simulation possibilities
Main menu

6. Simulation options (toolbar access)
Simulation setting
General
Control time
Outputs (Results, History Records)
Curves definition
Gravity
Global Damping
Materials
DEM Models
FEM Materials
Mesh Definition
Mesh selection
Meshing preferences
Particle bonds
Kinematic conditions
DOF constraints
Fixed movement (displacement, velocity)
Master-Slave conditions
Concentrated mass
Initial values
Contact definition
Create
Edit
DEM/FEM Coupling
Fixed coupling
Adaptive coupling
Toolbox
Normal direction checker
Filters
Simulation control
Run
Simulation Info
Restart
Stop current simulation

7. Wizard Sample – Silo 2D Check list Main menu – Silo wizard
Wizard – Silo 2D

8. Create geometry
Verify geometry requirements
(normal vectors)

9. Assign Layers (Sets) Group of entities Silo Silo Silo Silo Sand Silo
Bottom

10. Assign element types 1 2 2 2 1 2 2 2

11. Mesh properties Mesh definition (entities) Actives on simulation
Mesh history records

12. Assign materials Linear models Non linear models Simple linear elastic
Linear elastic with cohesion
Linear elastic with cohesion and rolling
Hardening, softening
Linear elastic with wear (DEM-RIGID)
Non linear models
Hertz-Mindlin
Elasto-plastic

13. Kinematic conditions Fixed DOFs (automatic) Predefined movement
Defined by curves
Local functions
Import user defined curves by points

14. Contacts
Create and edit
Automatic: BoundingBox, Tolerance, ….

15. Global damping
Viscous
Non-viscous

16. Global setting DOFs Times (End time,…) Outputs Gravity
Project comments

17. Mesh generation Circle (2D) / Sphere (3D) elements
Generation algorithms
Optimization radius (low porosity)
Radius expansion (high porosity)
Predefined porosity (experimental)
Embedded on GiD

18. Mesh quality - Radius distribution
Mesh generation
Mesh quality analysis
Mesh quality - Radius distribution

19. Calculate

20. Output setting Nr of results Nr of history record values
Results selection

21. Results 3 Groups: History records NODAL RESULTS DEM RESULTS
( Global results )
DEM RESULTS
( Elements, contacts )
FEM RESULTS
( Gauss points )
History records

22. Nodal results
Displacements
Velocities
Stress
Pressure
Internal forces

23. DEM results Broken bonds Cohesion Stress Contacts Results
Normal forces
Tangential forces
Local density
Wear (DEM-RIGID)

24. FEM results
Contact pressure
GP Stress
GP Strain …

25. History records DEM contacts Fabric tensor (isotropy evolution)
N contacts
N broken-bonds
All
Tension
Shear
Fabric tensor
(isotropy evolution)
Energy (Elastic, kinematic,…)
Stress
Force

26. Comments User friendly interface Preprocess Postprocess
Simple access definitions
2 level of users
Wizards  Industry
Toolbar  Academic, research
Preprocess
Almost full support in GiD
Integrated DEM mesh generation
Different generation techniques ( more in the future )
Postprocess
3D visualization !!

27. TO-DO list More wizards Manuals and tutorials Professional samples
Corporate image (TIC)
Web page (under construction)
Logo
Preprocess (GiD)
Visualization efficiency
Condition assignments
Postprocess (GiD)
Result visualization options (line size, stream lines, …)
Improve graph support

28. DEMPack 1.0
Coming soon…
Web: