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Balling plant simulation

Balling plant simulation. 2010-10-01. Punkter. Summary of research activities 2010 Balling plant simulator Simulation study of outlet design Consortium plan. Summary of research activities 2010. Block-parallel Cholesky factorization PCG-solver – moving contacting rigid bodies to GPGPU

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Balling plant simulation

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  1. Balling plant simulation 2010-10-01

  2. Punkter • Summary of research activities 2010 • Balling plant simulator • Simulation study of outlet design • Consortium plan

  3. Summary of research activities 2010 • Block-parallel Cholesky factorization • PCG-solver – moving contacting rigid bodies to GPGPU • Merge/split algorithm • Viscoplastic SPH – for large-scale stiff granular matter • Pipeline for new methods & models (Octave + Asymptote = Octasy) • Pipeline for AgX simulation studies – balling plant, statistics • Analysis of performance and model validation

  4. Balling plant - recap In: - fines (ore + binding) - undersized pellets 100 ton/h • Mono-sizedspherical pellets • Understand flow patterns and forces • Outlet design • Control variables • Agglomeration process • 100K – 100M particles • Time scales 1ms – 5min • 1/10 fraction real vs simulated time Out: - green pellets Return: - undersized pellets - oversized pellets (crush)

  5. Balling plant simulator • Data collection at LKAB • Preparatory simulations on drum segment • Pipeline & statistics • Effects of nonsmooth approach, time step, solver, iterations • Effects of drum texture, particle size, model parameters, rotation speed • Validation with collected data • Outlet design studies • testing ideas • optimization

  6. Balling plant simulator

  7. Balling plant simulator Types of data from simulation • Particle data (sampling frequency) • trajectories • velocity, pressure, overlap • Statistics (space and time averaged) • distribution functions • average and standard deviation • correlation functions • Field data (time averaged, grid & interpolation) • mass density • pressure field • velocity field • shear rate • inertial number, granular temperature

  8. Drum Material Solver Damping time 5*h FIXERA double -> float Number iterations default flera threads men ejpålösare

  9. Observations - preliminary d / v = 0.05[m] / 2[m/s] = 0.02 [s]

  10. d / v = 0.03[m] / 2[m/s] = 0.015 [s]

  11. d / v = 0.015[m] / 2[m/s] = 0.0075 [s]

  12. Average velocity vs time step

  13. Velocity distribution functions

  14. Particle velocity r = 7.5 mmh = 0.01, 0.001, 0.0001 s

  15. Particle velocity r = 15 mmh = 0.01, 0.001, 0.0001 s

  16. Particle velocity r = 25 mmh = 0.01, 0.001, 0.0001 s

  17. Average pressure vs time step

  18. Pressure distribution functions

  19. Particle pressure r = 7.5 mmh = 0.01, 0.001, 0.0001 s

  20. Particle pressure r = 15 mmh = 0.01, 0.001, 0.0001 s

  21. Rotational velocity r = 25 mm, 15, 7.5 mm

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