[lammps-users] Imposing normal way direction

Hello Everyone,
I am trying to implement, in a locked system with a given crystalline structure made by hard spheres, that the latter transmit the force (and deform) only along the normal contact direction between the spheres (obviously if I apply a certain external force). If this direction was fixed, I could use fix oneway, but since the normals between the spheres are always changing, I would need a suggestion from you.

Thank you in advance for your help,

Giuseppe Petrillo

This sounds like you may need to implement a custom fix for this purpose.