Steady-state simulation with evolution of Velocity

Dear Igor,

I would like to launch my last simulation and see where if it can get to something. Could you kindly indicate me a sure set up for example a simulation control of 20 seconds with a steps every 5 seconds ? Anything, just something simple that would indicate me that what I try to achieve is possible to do.
If the 20 seconds is too long , even 4 seconds with a step every one second. Simply something working because even if you and Ricardo seemed to have validated the process none of the set up did lead to any concrete result but a bug at 5 min computing time.
i Join the last link

Thank you so much !
Looking forward to reading from you,
Kitty