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GridBC Command

Velocity, temperature, and concentration conditions are applied to nodes in the background MPM mesh by using a series of GridBC blocks. Each blocks selects some nodes using one subordinate shape command. The format for the block is:

GridBC
  (one shape command, which can be nested)
  (any number of Velocity, Temperature, Concentration, or PorePressure commands)
EndGridBC

All nodes within the one shape can be assigned velocity, temperature, or concentration conditions by using commands between GridBC and EndGridBC.

Notes

  1. Use only 2D shapes or 3D shapes for 2D or 3D simulations, respectively.
  2. When doing axisymmetric MPM, nodes at r=0 will automatically be set to zero velocity in the r directions. You therefore need not set those conditions. Furthermore any non-zero r-velocity conditions you do set, as well as any conditions on nodes with r<0, will be deleted.
  3. The GridBC command is only allowed for MPM analyses.