We added the following clarification to the end of the non-dimensionalization section: “In the subsequent sections, simulations for β = 0 use a modified interaction force such that there is no cohesion, but the hard core repulsion is maintained, i.e., 0 0 c F = for 0 h ≥ , otherwise 0 c c F F = with β = 0.125.”
Second Round of Evaluation Round 2: With the exception of their response to one key point, the authors' responses are satisfactory.