restricting particle-particle interaction to a certain group

Submitted by kalei on Thu, 05/19/2016 - 11:21

In my model I want to analyse the velocities of particles when they cross a certain plane of my computation domain. By taking those particles out of the nve integration I can "freeze" them and have access to the velocity data when they pass the plane. However I have the problem that after a certain time the "frozen" particles block the plane. I think the problem is that particle-particle interaction is still active. Is it possible to turn off particle-particle interaction for the particles of a certain group and make the "frozen" particles invisible for later ones passing the plane?

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Daniel Queteschiner | Thu, 05/19/2016 - 11:47

>>In my model I want to analyse the velocities of particles when they cross a certain plane of my computation domain.
You do know that fix massflow/mesh can do that, do you?

To turn off pairwise interactions between certain pairs of atoms you may use the exclude option of the neigh_modify command:
http://www.cfdem.com/media/DEM/docu/neigh_modify.html
(Note that particle insertion does not take this option into account (different kind of neighbor list) )