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DEMPack: Discrete Element Simulation Software

DEMPack is a powerful and user-friendly discrete element method (DEM) simulation software developed by the International Center for Numerical Methods in Engineering (CIMNE) in Barcelona, Spain. With its intuitive user interface and advanced simulation technology, DEMPack offers a wide range of features and tools for both beginner and advanced users. It supports both 2D and 3D simulations, different contact models, cohesive bonds, wear analysis, and explicit finite element method (FEM) coupling. With DEMPack, users can easily create, edit, and analyze complex simulations for various industrial, academic, and research applications.

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DEMPack: Discrete Element Simulation Software

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

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

  3. Software philosophy • 2 level of users • 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. 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 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

  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 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 • 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 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: • NODAL 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 • N contacts • N broken-bonds • All • Tension • Shear • Fabric tensor (isotropy evolution) • Energy (Elastic, kinematic,…) • Stress • Force

  26. Comments • User friendly interface • 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 • Almost full support in GiD • 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: www.cimne.com/dempack Email: dempack@cimne.upc.edu

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