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Minimum element size and zero element volume error

Minimum element size and zero element volume error

Minimum element size and zero element volume error

Hoping you can help me out eng-tips,

I'm an undergrad student doing summer research, and trying to model a particle collision between two simple spherical particles. The particles have diameters in the range of 50 - 200 microns. I am trying to run a 2D axisymmetric simulation using Ansys Explicit Dynamics in Workbench 15.0. I can refine the mesh near the contact point using a body sizing mesh with a sphere of influence and the mesh generates just fine (with element sizes of about 1 micron). When the simulation runs though, I immediately get "Zero or negative element volume" errors. If I increase the element size I can get it to run, but I lose the resolution I want to have. I think it might be a precision problem, if the elements are so small that the volume rounds to zero. Is there any way around this? Any help or pointers would be appreciated.

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