Is the seepage force included in the computation of stress of atom using "compute stress/atom" command?

Hi all,

I am a little confused about one issue: In liggghts, we can output the stress of the an atom using command "compute stress/atom". If we introduce the seepage force into the simulation using CFDEM engine, e.g. drag force, buoyant force. Does the calculated stress of atom include these seepage force, or it only includes the particle-particle and particle-wall interaction force?

Thank you very much.
Zheng