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Re: question about clump?

 


 thank you for the reply!


    at the begining the clumps have both rotational and translational motion, but later the rotational motion finish and just have translational motion. at this time I found the clump slip on the plane in a curve. I think its trajectory should slip in a line, because there is no rotational motion and just have translational motion.

 

Jingsong

 
> From: eudoxos@xxxxxxxx
> To: yade-users@xxxxxxxxxxxxxxxxxxx
> Date: Fri, 5 Jun 2009 22:02:48 +0200
> Subject: Re: [Yade-users] question about clump?
> 
> What's the problem there? The new clump collides with the other clump
> getting some rotational motion, then different spheres hit the ground at
> different points which makes its trajectory bend towards the side of
> contact, as there is shear. Did I miss something?
> 
> Vaclav
> 
> > Hello, everyone, sorry to bother you again!
> > First thank Vaclav for the reply about box interaction. Vaclav
> > suggested me "replacing box by a few clumped spheres would be good
> > enough for your purposes."
> > These days I try to learn how to use clump as the example in
> > yade(ClumpTestGen), but i noticed there seems exist some unreasonable
> > movement in the shear direction when I generated more some clumps in the
> > example(ClumpTestGen). is it because of the interaction between clumps?
> > 
> > I just make the plane bigger and add two more clumps as follow:
> > 
> > shared_ptr<Body>
> > ground=Shop::box(Vector3r(0,0,-1),Vector3r(10,10,.2));
> > 
> > // three-sphere clump
> > clumpPos=Vector3r(0.5,2.5,2);
> > relPos.push_back(Vector3r(0,-.5,.5)); radii.push_back(.5);
> > relPos.push_back(Vector3r(0,.5,0)); radii.push_back(.5);
> > relPos.push_back(Vector3r(.5,0,0)); radii.push_back(.5);
> > createOneClump(rootBody,clumpPos,relPos,radii);
> > relPos.clear(); radii.clear();
> > 
> > // four-sphere clump (this one seems have abnormal movement,
> > horizontal translation in a curve (not a line) on the plane after
> > interaction)
> > clumpPos=Vector3r(0.5,-2.5,2);
> > relPos.push_back(Vector3r(0,0,0)); radii.push_back(.5);
> > relPos.push_back(Vector3r(.5,0,0)); radii.push_back(.5);
> > relPos.push_back(Vector3r(0,.5,0)); radii.push_back(.5);
> > relPos.push_back(Vector3r(0,0,.5)); radii.push_back(.5);
> > createOneClump(rootBody,clumpPos,relPos,radii);
> > relPos.clear(); radii.clear();
> > 
> > setDefault("param_damping",.8); //(made changes in shop)
> > 
> > I set up time step=10e-5 on control panel.
> > 
> > thank you very much!
> 
> 
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