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

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

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)

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

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

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

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

Create geometry Verify geometry requirements (normal vectors)

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

Assign element types 1 2 2 2 1 2 2 2

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

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

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

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

Global damping Viscous Non-viscous

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

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

Mesh quality - Radius distribution Mesh generation Mesh quality analysis Mesh quality - Radius distribution

Calculate

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

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

Nodal results Displacements Velocities Stress Pressure Internal forces

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

FEM results Contact pressure GP Stress GP Strain …

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

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 !!

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

DEMPack 1.0 Coming soon… Web: www.cimne.com/dempack Email: dempack@cimne.upc.edu