The VDH cohesive forces I want to add on are different for particle-particle and particle-wall. I am not sure which file should be focus on, calc_collision_wall_mod.f or calc_force_dem_mod.f? It seems that calc_collision_wall_mod.f is for STL wall which is not used in my case. However, the VDH cohesive forces in calc_collision_wall_mod.f are same for particle-particle and particle-wall. They share the same codes. What can I do if the expressions for their VDH cohesive forces are different?
Particle-particle forces are computed in calc_force_dem_mod.f and Particle-wall forces are computed in calc_collision_wall_mod.f. They do not share the same code. Even if you do not use STL geometry, the regular (rectangular geometry) wall are converted to triangles so it follows the same logic as STL files.
