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Message #05348
Re: [Question #175394]: numerical instability and small time steps
Question #175394 on Yade changed:
https://answers.launchpad.net/yade/+question/175394
Christian Jakob posted a new comment:
> Spheres also need to have the same mass in Yade and PFC.
mass PFC: 4.188790204786e-6
mass YADE: 4.18879020479e-6
force-disp. curves:
PFC without viscous damping:
un ................. vs. Fn
------------ ------------
-1.0000e-004 0.0000e+000
-1.0000e-004 1.2778e-001
-9.3899e-005 1.1626e-001
-8.6133e-005 1.0214e-001
-7.6904e-005 8.6172e-002
-6.6440e-005 6.9198e-002
-5.4985e-005 5.2098e-002
-4.2785e-005 3.5758e-002
-3.0071e-005 2.1071e-002
-1.7056e-005 9.0007e-003
YADE without viscous damping:
un ................. vs. Fn
*first step not available*
-9.4559e-05 0.124283508259
-8.9266e-05 0.117490612129
-8.2429e-05 0.107764352662
-7.4222e-05 0.0956237678404
-6.4845e-05 0.0817047043681
-5.4512e-05 0.0667209759367
-4.3443e-05 0.0514267093956
-3.1849e-05 0.036586864111
-1.9927e-05 0.0229667479151
PFC with viscous damping:
un ................. vs. Fn
------------ ------------
-1.0000e-004 0.0000e+000
-1.0000e-004 1.2778e-001
-9.3899e-005 1.1626e-001
-8.6242e-005 1.0234e-001
-7.7253e-005 8.6760e-002
-6.7174e-005 7.0348e-002
-5.6253e-005 5.3910e-002
-4.4732e-005 3.8227e-002
-3.2834e-005 2.4040e-002
-2.0755e-005 1.2082e-002
YADE with viscous damping:
un ................. vs. Fn
*first step not available*
-9.4594e-05 0.121855832544
-8.9402e-05 0.112865153894
-8.2758e-05 0.101313188504
-7.4857e-05 0.0878212559716
-6.5908e-05 0.0730792438382
-5.6132e-05 0.0578038888246
-4.5744e-05 0.042703264729
-3.4948e-05 0.0284531709081
-2.3928e-05 0.0156941209448
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