Adaptive DEM / FEM Coupling

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Presentation transcript:

Adaptive DEM / FEM Coupling International Center for Numerical Methods in Engineering (CIMNE) Barcelona, Spain

Definition of the coupling scheme Penalty or Lagrange Multipliers Overlapping or Not overlapping* * Mesh generation condition for DEM/FEM interface

Elastic wave propagation 2D Displacements

Three-point bending of a beam with a notch ( DEM/FEM ) Broken bonds dem-fem-beam-frac3ps-bb.mpg

Study of rock excavation 2D Equivalent stress distribution CPU Time DEM : 30 Hrs DEM/FEM : 16 Hrs dredge6-fem2-lag-damp-hms-3.mpg

Dynamic DEM / FEM coupling Criteria ( FEM to DEM ) σ > α · σmax , α = [0.5, 1.0] FEM with elastic behavior Computational cost effect

Three-point bending of a beam with a notch Max Stress

Three-point bending of a beam with a notch Max Stress

Three-point bending of a beam with a notch DEM connectivities

Unconfined compresion test 2D Stress

Rock cutting 2D Cohesion

Rock cutting 2D Max stress

Rock cutting 2D Forces evolution

Projectile impact 2D Cohesion

Projectile impact 2D Stress

3D beam with a notch cohesion

3D beam with a notch Interaction forces FEM DEM/FEM

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