Besseron, Xavier

Peters, Bernhard

Open Repository and Bibliography - Luxembourg

      Page 1 XDEM: Extended Discrete Element Method      Luxembourg XDEM Research Centre  http://luxdem.uni.lu/ Bernhard Peters   Xavier Besseron Workshop on HPC Collaboration between  Europe and Latin America July 16, 2015       Page 2 XDEM: Extended Discrete Element Method  Thermal conversion of packed/moving beds  Conjugate heat/mass transfer  Reactor design  Computational Process Engineering Computational Dynamics  Transport and storage of granular media  Impact of granular media on structures   Advanced materials  Material processing  Fracture    Computational Material Science Strategic Competency  Single/multi-phase reacting flow  Emissions  Simultaneous FEA/CFD analysis  CFD / FEA       Page 3 XDEM: Extended Discrete Element Method Extended Discrete Element Method (XDEM) Extended Discrete Element Method:   • based on the classical Discrete Element Method (DEM) to describe motion of granular materials (discrete phase) • extended by  • thermodynamics for particles • an interface to Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) • Coupling to external commercial/OpenSource software       Page 4 XDEM: Extended Discrete Element Method Technology Concept XDEM CFD FEA       Page 5 XDEM: Extended Discrete Element Method Benefits • Appropriate solution strategy for discrete and continuous phase • High resolution of both discrete and continuous phase • No empirical correlations • No expensive experiments, sometimes even not feasible • Retains individual inputs • Common post-processing preferred, although individual  post-processing feasible  Combination of expert tools for maximum synergy by coupling continuous and discrete phases in physical and numerical space       Page 6 XDEM: Extended Discrete Element Method Applications • Storage and transport of granular material • Mining and its machinery • Agriculture and its machinery • Processing industry: Fluidised beds, fixed and  moving bed reactors for • Drying • Thermal conversion (combustion, gasification) • Processing of raw materials • Pharmaceutical industry e.g. coating, drug production • Food industry (transport, coating, processing) • Material science       Page 7 XDEM: Extended Discrete Element Method       Page 8 XDEM: Extended Discrete Element Method Computational Process Engineering • Generic model to describe particle  processes: • Temperature distribution • Flow inside pore space • Chemical conversion • Distribution of reactands and  products • Interface to CFD via heat and  mass transfer       Page 9 XDEM: Extended Discrete Element Method Forward Acting Grate       Page 10 XDEM: Extended Discrete Element Method Spatial and Temporal Temperature Distribution       Page 11 XDEM: Extended Discrete Element Method Void Space and Gas Velocity       Page 12 XDEM: Extended Discrete Element Method Drying Water mass fraction Gas tem- perature       Page 13 XDEM: Extended Discrete Element Method Packed Bed Conversion       Page 14 XDEM: Extended Discrete Element Method Thermal Conversion: Reduction Coke t=10s t=300s t=700s        Page 15 XDEM: Extended Discrete Element Method       Page 16 XDEM: Extended Discrete Element Method Computational Dynamics • Prediction of motion of granular   material for industrial applications • Based on the Discrete-Element    Method Dynamics  • Integration of Newtonian dynamics to   yield position and orientation • Interface to FEM for mechanical load       Page 17 XDEM: Extended Discrete Element Method Vibrating Grate       Page 18 XDEM: Extended Discrete Element Method Residence Time on a Forward Acting Grate       Page 19 XDEM: Extended Discrete Element Method Transport of Debris       Page 21 XDEM: Extended Discrete Element Method       Page 22 XDEM: Extended Discrete Element Method Computational Material Science • Inclusion of arbitrary adhesive/bonding    forces • isotropic/anisotropic material behaviour • crack development and propagation • fracture mechanics due to mechanical    impact or gas forces       Page 23 XDEM: Extended Discrete Element Method Collision and Bonding Collision  Bonding        Page 24 XDEM: Extended Discrete Element Method Complex Structures of Materials Material matrix  Stength of Bonds  Discrete Description  FEM by P. Hagenmuller (IRSTEA Grenoble)       Page 25 XDEM: Extended Discrete Element Method Ductile – Brittle Behaviour Duktile Failure  10-6s-1 10-2s-1 Brittle Failure        Page 26 XDEM: Extended Discrete Element Method       Page 29 XDEM: Extended Discrete Element Method Stress/strain analysis of a Membrane       Page 30 XDEM: Extended Discrete Element Method Tire-Ground Interaction       Page 33 XDEM: Extended Discrete Element Method Fluidisation       Page 34 XDEM: Extended Discrete Element Method       Page 35 XDEM: Extended Discrete Element Method Parallel Implementation XDEM is computation intensive and uses a lot of memory  → Parallel and distributed implementation • Aggregates memory of many computing nodes • Benefits from speedup of many computing cores  • Simulation Space Decomposition approach • Load balancing based on • Orthogonal Recursive Bisection (ORB) • Metis partitioning library • Communication using MPI          Page 36 XDEM: Extended Discrete Element Method Future improvments for HPC  • OpenMP implementation → First trials showed promising results  • Accelerators: GPUs / Intel Xeon Phi →  Probably the next big step for XDEM → Need to implement fast collision detection algorithms  • Post-processing / Visualization →  Currently in 2 steps:   Data reconstruction + Offline visualization → Need for real-time data processing and visualization          Page 37 XDEM: Extended Discrete Element Method Summary XDEM is a novel and advanced simulation framework  for multi-physics applications  XDEM is versatile • Multi-phases, particle-based simulations • Motion, Thermo-dynamical and Chemical conversion • Coupling with CFD and FEA libraries → Large range of industrial applications  XDEM is getting ready for HPC • MPI-based parallel implementation • Accelerator support coming?       Page 38 XDEM: Extended Discrete Element Method Potential collaborations XDEM team: 90% of mechanical/chemical engineers → Need additional expertise in Computer Science / HPC  Engineering aspect • New industrial applications • New “models” to include  High Performance Computing aspect • OpenMP implementation • Accelerators support: GPUs / Intel Xeon Phi  Post-processing / Visualization • Real-time visualization tool          Page 39 XDEM: Extended Discrete Element Method Thank you for you attention! Question? Luxembourg XDEM Research Centre  http://luxdem.uni.lu/ Bernhard Peters   bernhard.peters@uni.lu Xavier Besseron   xavier.besseron@uni.lu 

XDEM: eXtended Discrete Element Method

http://orbilu.uni.lu/bitstream/10993/40159/1/talk_whpceurolatam_xdem.pdf

XDEM: eXtended Discrete Element Method

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