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question about clump?

 

   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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