tSet contact age to zero if there is Coulomb slip - Granular.jl - Julia package for granular dynamics simulation
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       ---
   DIR commit b640f26eebec4330354379ec734a996089ec7def
   DIR parent d67f4c7667ccc392ddf6943d38f976613f9f3fff
  HTML Author: Anders Damsgaard <andersd@riseup.net>
       Date:   Wed, 21 Feb 2018 09:07:36 -0500
       
       Set contact age to zero if there is Coulomb slip
       
       Diffstat:
         M src/interaction.jl                  |       2 ++
       
       1 file changed, 2 insertions(+), 0 deletions(-)
       ---
   DIR diff --git a/src/interaction.jl b/src/interaction.jl
       t@@ -258,6 +258,7 @@ function interactGrains!(simulation::Simulation, i::Int, j::Int, ic::Int)
                force_t = abs(γ_t * vel_t)
                if force_t > μ_d_minimum*abs(force_n)
                    force_t = μ_d_minimum*abs(force_n)
       +            simulation.grains[i].contact_age[ic] = -simulation.time_step
                end
                if vel_t > 0.
                    force_t = -force_t
       t@@ -270,6 +271,7 @@ function interactGrains!(simulation::Simulation, i::Int, j::Int, ic::Int)
                if abs(force_t) > μ_d_minimum*abs(force_n)
                    force_t = μ_d_minimum*abs(force_n)*force_t/abs(force_t)
                    δ_t = (-force_t - γ_t*vel_t)/k_t
       +            simulation.grains[i].contact_age[ic] = -simulation.time_step
                end
        
            else