twall normal force changed to avoid attraction, sign test - sphere - GPU-based 3D discrete element method algorithm with optional fluid coupling
 (HTM) git clone git://src.adamsgaard.dk/sphere
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       ---
 (DIR) commit 35b9d27b4dc7e82477a881d891b4eaf9ae572b70
 (DIR) parent 3541524c4cd9b0c3c474232ca6bb9e469e5b5546
 (HTM) Author: Anders Damsgaard <anders.damsgaard@geo.au.dk>
       Date:   Fri, 20 Jun 2014 09:27:33 +0200
       
       wall normal force changed to avoid attraction, sign test
       
       Diffstat:
         M src/contactmodels.cuh               |       4 +++-
       
       1 file changed, 3 insertions(+), 1 deletion(-)
       ---
 (DIR) diff --git a/src/contactmodels.cuh b/src/contactmodels.cuh
       t@@ -50,7 +50,9 @@ __device__ Float contactLinear_wall(Float3* F, Float3* T, Float* es_dot,
        
            // Normal force component: Elastic - viscous damping
            //Float3 f_n = (-devC_params.k_n * delta - devC_params.gamma_wn * vel_n) * n;
       -    Float3 f_n = (-devC_params.k_n * delta + devC_params.gamma_wn * vel_n) * n;
       +    //Float3 f_n = (-devC_params.k_n * delta + devC_params.gamma_wn * vel_n) * n;
       +    Float3 f_n = fmax(0.0, -devC_params.k_n*delta
       +                     - devC_params.gamma_wn*vel_n) * n;
        
            // Print data for contact model validation
            /*printf("f_n_elast = %f\tgamma_wn = %f\tf_n_visc = %f\n",