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Re: hello? -help with a spinning bucket!


''Do you have friction on
bottom boundary?''

the million dollar question!

In many of my simulations, it seems obvious to me that I don't.  Later I thought that maybe it was because this was a transition phenomenon, that in real time in the simulation, only a fraction of a second had passed by, but I rather doubt that.  I tried to solve this problem by specifying a material for the spheres and the facets, hence my questions about internal friction angles, but when I tried that, it didn't seem to work.

I am assuming that once you specify the materials involved, and gravity, and the motion of the cylinder, everything else takes care of it's self.

the other thing to consider is that there are at least two models of frictional interaction that can be used, one uses poisson and young ang internal friction, while the other uses other stuf.  I have not looked in detail into the differences between these yet.

--- On Thu, 7/8/10, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx> wrote:

From: Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>
Subject: Re: [Yade-users] hello? -help with a spinning bucket!
To: yade-users@xxxxxxxxxxxxxxxxxxx
Received: Thursday, July 8, 2010, 5:45 AM



I am using paraview for two reasons:  first, I have the vague idea that
it will get the job done faster, that I will have less time to wait,
which I now suspect is not the case, second, it allows me to control
the speed at which I view the simulation, which I don't believe is
possible using the Qt view.  correct me if I am wrong.



You tried pressing F10 during a simulation yes? Of course you can't see
the result faster than it is actually computed, but you can always
reduce the number of particles.

        I am including several videos this
time.  I assume it is fairly obvious that there are things that are not
right, given my previous description of what should in fact be



It seems the discretization of the cylinder is too coarse, resulting in
permanent impacts between spheres and facets. Do you have friction on
bottom boundary? It seems the bucket rotation is very fast compared to
particles motion.



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