hrough an inner loop over the particles that are contained in their Verlet lists, and all walls.</p><p>The Verlet list of a particle contains other particles that are whithin a threshold distance, called Verlet distance, and have a higher ID number. This list is updated in a given frequency, which is smaller (less often) than the search frequency.</p><p>The reference element of each interaction (element 1) is the particle with smaller ID number.</p><p>For each interaction found, a binary <a href="Interactio