Question #403137 on Yade changed:
https://answers.launchpad.net/yade/+question/403137

    Status: Open => Answered

Jan Stránský proposed the following answer:
Basically you can prescribe velocity as an initial condition.
Without blocked dof, the velocity will be changed as the particle interact
or by gravity etc. If you block the dof with prescribed velocity, it will
not change (unless you change it manually) regardless interactions with
other particles.
cheers
Jan


2016-10-18 1:37 GMT+02:00 Weimin Song <question403...@answers.launchpad.net>
:

> New question #403137 on Yade:
> https://answers.launchpad.net/yade/+question/403137
>
> Dear all,
>
>          I'm confused about one small question.
>          In the manual[1],  when a velocity is imposed, why the
> corresponding degree should be blocked?
>
>          Example:
>
>          O.bodies.append(sphere((0,0,0),1))
>          O.bodies[0].state.blockedDOFs='x'
>          O.bodies[0].state.vel=(10,0,0)
>
>
> [1] https://yade-dem.org/doc/user.html#imposed-velocity
>
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