yade-users team mailing list archive

[chiara modenese <c.modenese@xxxxxxxxx>]

On 23 April 2010 14:06, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx> wrote:

> A logic I found very efficient for this problem (perhaps already possible
> in Yade?) is the one of PFC :
> You can declare some DOF's fixed for velocities/spins (say, Vx is declared
> fixed).
> After that, if you set Vx=0, the body doesn't move. If you set
> Vx=something, it will move at constant Vx.
> If it not yet implemented, it would be a piece of cake to put this in
> NewtonIntegrator, and we could get rid of engines (TranslationEngine is a
> joke if you ask me, an engine just to move bodies at constant speed?).
>

Yes Bruno, this would be lovely (and perhaps simple to do). Can we (you) do
that? Do we already have a sort of DOFs for velocities exactly as for
generalized displacements?

c.

>
> Bruno
>
>
> Václav Šmilauer a écrit :
>
>  Ok, thanks a lot. But how is it that with TranslationEngine doesn't
>>> work? I mean it doesn't because we account for the displacement twice?
>>> I am looking at the code right now but I cannot find out why..
>>>
>>>
>>
>> TranslationEngine will work for dynamic bodies, as it only sets
>> velocity, nothing else. It will fail for non-dynamic bodies, as velocity
>> will not be integrated for them (JumpChangeSe3 does that, however).
>>
>> BTW It is a good idea to use interpolating engine for cyclic loading and
>> such 1-1 particle tests, rather than ugly loops I had. You'd prescribe
>> points in time and values of displacement etc, and then the engine takes
>> care of the rest. I hope we find a way to make it a piece in Yade Lego.
>>
>> Cheers, v.
>>
>>
>>
>>
>>
>>
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>
>
> --
> _______________
> Bruno Chareyre
> Associate Professor
> Grenoble INP
> Lab. 3SR
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