which command can be used to make all particles to be static

Submitted by Rachel on Wed, 08/15/2018 - 06:22

Hi all,

I am doing a triaxial test using LIGGGHTS. After I consolidated my sample in a cube to a constant confining pressure 50kPa, I want to set one boundary which can be penetrated by the small particles while keeping the big particles insides. During this process, the small particles will penetrate through the boundary suddenly and the cube sample will suddenly deform (the volumetric strain could be even 7%).

I don't expect such a large deformation. Is there any method that we keep all particles to be static before I change the boundary condition, so that the small particle will not penetrate through the boundary so quickly?

To be brief, which command can be used to make all particles to be static? Thanks.

Best,
Rachel