ball fix
command
Syntax
- ball fix keyword ... <range>
Primary keywords:
spin spin-x spin-y spin-z velocity velocity-x velocity-y velocity-z
Fix the specified ball velocities. As a result, ball motion is constant in the specified directions.
- spin
The angular velocity is fixed.
- spin-x (3D ONLY)
Fix the \(x\)-component of the angular velocity.
- spin-y (3D ONLY)
Fix the \(y\)-component of the angular velocity.
- spin-z (3D ONLY)
Fix the \(z\)-component of the angular velocity.
- velocity
The translational velocity is fixed.
- velocity-x
Fix the \(x\)-component of the translational velocity.
- velocity-y
Fix the \(y\)-component of the translational velocity.
- velocity-z (3D ONLY)
Fix the \(z\)-component of the translational velocity.
Usage Examples
Fix (set constant) the \(x\)-, \(y\)-, and \(z\)-velocities and spin for balls whose centroids’ \(x\)-positions lie between -3 and -1.
ball fix velocity-x velocity-y velocity-z spin-x spin-y spin-z ...
range position-x -3 -1
from “fragment.dat” in Fragmentation Analysis during a Uniaxial Compression with Crack Tracking Using Fractures
Fix the \(z\)-velocity for all balls in the group named bottom_grip
.
ball fix velocity-z range group 'bottom_grip'
from “tension.dat” in Rock Testing
Fix translational velocity for all balls whose centroids’ \(y\)-positions lie between -6 and -5.5.
ball fix vel range position-y -6 -5.5
from “load.dat” in Slip on a Fault
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