RECORDING COMPARISON ============================================================================== Runs compared ------------------------------------------------------------------------------ [1] Demo 03 Shuttle Head 19 deg transfer new Recording Part-e 0.1 checkbox On 101 frames, t = 0.04 to 4.04 s (compared over the last 25 frames) [2] Demo 03 Shuttle Head 19 deg transfer new Recording Part-e 0.8 checkbox On 101 frames, t = 0.04 to 4.04 s (compared over the last 25 frames) Measured over: particles within X from -1.2 to 0.5, Y from -0.5 to 0.5, Z from -0.5 to 0.5 only. DEM input settings ------------------------------------------------------------------------------ Setting [1] [2] ------------------------------------------------------------------------------ Time step dt (s) 0.002000 0.002000 Recording frames per second 25 25 Particle-particle restitution 0.100 0.800 <-- differs Particle-particle damping appl~ Yes Yes Particle stiffness Kn 50 50 Face stiffness Kn 500 500 Shear stiffness Ks 1000 1000 Particle penetration (%) 5.00 5.00 Particle-particle friction 0.500 0.500 Rolling friction 0.200 0.200 Cohesion energy density k (Pa) 0.0 0.0 Global bounds min (x, y, z) -10.00, -10.00, -2.~ -10.00, -10.00, -2.~ Global bounds max (x, y, z) 10.00, 10.00, 5.00 10.00, 10.00, 5.00 One setting differs: Particle-particle restitution. Measured range over the settled frames ------------------------------------------------------------------------------ Metric [1] Demo 03 Shuttle He~ [2] Demo 03 Shuttle He~ ------------------------------------------------------------------------------ Particles 249 to 276 274 to 297 Particles in contact (%) 80.8 to 90.8 79.6 to 86.0 Mean nearest-neighbour gap (~ -0.0302 to -0.0254 -0.0278 to -0.0228 Mean speed (m/s) 2.920 to 3.196 2.934 to 3.057 Max speed (m/s) 4.429 to 4.572 4.519 to 4.855 Kinetic energy (J) 278.96 to 335.63 310.93 to 349.25 Mean height (z) (m) 0.030 to 0.079 0.017 to 0.046 Spread X (m) 1.670 to 1.699 1.667 to 1.699 Spread Z (m) 0.772 to 0.833 0.807 to 0.843 Where the runs genuinely differ ------------------------------------------------------------------------------ Comparing 25 matching frames, one against one: One run leads far more consistently than chance would explain, so these are real trends rather than frame-to-frame noise: Particles [2] higher by 26 100% of frames, clear Particles in contact [1] higher by 3.6 % 80% of frames, clear Mean nearest-neighbour gap [2] higher by 0.0017 m 84% of frames, clear Max speed [2] higher by 0.162 m/s 100% of frames, clear Kinetic energy [2] higher by 21.91 J 76% of frames, likely Mean height (z) [1] higher by 0.020 m 92% of frames, clear Spread Z [2] higher by 0.027 m 100% of frames, clear No reliable difference (the two runs swap order too often to tell apart): Mean speed leads in 68% of frames - within chance Spread X leads in 68% of frames - within chance ------------------------------------------------------------------------------ A metric listed as no reliable difference is not proof the runs are the same, only that this comparison cannot tell them apart. Narrowing the region, or recording more frames, will separate a smaller real difference.