Bounding Box
Use the Bounding Box feature to add a virtual rectangular box that bounds the modeling domains. Any grains that cross the bounds of this box are removed from the simulation. This feature can be used to discard the grains that move away from the region of interest since these grains may otherwise have an adverse effect on the performance of the simulation. Only one Bounding Box node can be added to the model.
Settings
Select an option from the Specify bounding box list: From geometry or User defined (default).
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If From geometry is selected, a grain is immediately removed if it reaches the surface of the bounding box of the geometry, defined as the smallest rectangle or rectangular prism with edges parallel to the axes of the global coordinate system that encloses all of the geometric entities. This bounding box is extended by 5% in each direction so that the grains can still interact with boundaries that coincide with the perimeter of the bounding box.
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If User defined is selected, enter the values of the x minimum, x maximum, y minimum, and y maximum. In 3D components, also enter the values of z minimum and z maximum. A grain is immediately terminated if it reaches the surface of a box of user-specified dimensions.