Rigid Blocks and Clumps

In addition to improved computational performance, rigid blocks have been enhanced so that it's possible to:

  • Cut rigid blocks during cycling, retaining contacts
  • Easily apply rigid block boundary conditions
  • Simplify model creation via facet groups
  • Densify rigid blocks via cutting

The clumping logic has been generalized, allowing collections of balls and/or convex rigid blocks to be clumped together. This logic permits:

  • Modeling concave shapes with rigid blocks instead of pebbles. For example, models composed of the dolos object shown below (left and center) requires about the same modeling time as the clump (right), but does not suffer from bumpy surfaces and normal stiffness issues
  • Improved simulations of fragmentation; clumps (including rigid blocks) can now break (e.g., pebbles may be freed from clumps during cycling) without losing the contact information
  • The clump inertia tensor and volume computations are now multi-threaded
Using FISH, clumps are assigned a strength and are broken into sub-pieces if the minimum principal stress reaches a strength threshold.

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