[lammps-users] Achieving stress anisotropy in granular media

Dear all,

I hope you don’t mind if I’d ask this group for some help even though it pertains more to simulation protocol than to LAMMPS itself. Is there a way I can achieve stress anistropy for a frictionless 2D granular array which is confined by 4 non-periodic walls? Currently if I perform an isotropic compression simulation, I notice that my stress components are equal which makes it hydrostatic. I was wondering if anyone had a way to achieve non-hydrostatic conditions where the normal components have different values or could point me to a paper or two to achieve this?

Thank you!