I was trying to model a tank partially filled with water to impact. It is very counter intuitive that a coarse mesh produces better results in this case. Perhaps there is an atlernative contact scheme that is more robust? If not, how do I know how much contact stiffness to add to get the same results as the coarse mesh. I would have thought this would be handled more robustly for such a simple problem then have to manually tweak contact scale factors. Presumably this is something to do with the contact stiffness, since all formulations SOFT=0,1,2 have contact stiffness dependent on either the mesh size or the timestep (via, in part, the mesh size). I am using AUTOMATIC_SINGLE_SURFACE with SOFT = 1 but this happened with SOFT = 2, also.
Nothing was changed in the problem setup except for mesh size.
The ball seems to dimple the surface but then just ghosts right through the plate. At a medium sized mesh I get expected resultsįor the much finer mesh (below mesh hidden since it is too fine). I have a simple ball impacting a blate (with some added erosion to simulate a perforation).
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