yade-users team mailing list archive

[sega <dorofeenko@xxxxxxxxx>]

> > With the linear velocities here no problem.
> Why really no problem ? I wonder in fact about the case of an 
> interaction between a non dynamic body (whose velocity was never 
> affected by an Engine) and a dynamic one, example : a sphere and a wall 
> in the TriaxialTest. If the velocity of the wall is indeed zero (as it 
> was defined so in the createBox of the PreProcessor of TriaxialTest, and 
> never changed after), _whereas its position changes_, the computations 
> of relative displacements between this wall and the sphere will be 
> wrong, not ?

Wall's velocity is need if
1. there is the shear contact => the velocity is need for incremental shear displacement (=>the shear force, friction)
2. there is the viscous dissipation => the  velocity is need for dumping force.
For normal elastic contact without viscous the velocity isn't need (the normal displacement is nonincremental but instantaneous)
In you example, as seems, the wall's shear movement will be not influence on the sphere... 
Is that a bug or a feature is dependent on TriaxialTest purposes. :)

Best regards, Sergei D.

_______________________________________________
Yade-users mailing list
Yade-users@xxxxxxxxxxxxxxxx
https://lists.berlios.de/mailman/listinfo/yade-users