I was trying to test out the gas sand forces dop, but I'm not sure how it's supposed to be used. Especially, what should I input for the strain field (which asks for a matrix field, right?) I was attempting to plug it into the flip solver, but any insight on how its used, at all, in any example, would be of great help.

I'm actually trying to test if its feasible to use the flip solver to simulate grains and the kinds of structures formed when clumped together sand breaks. You know, like in the lagoa video (http://vimeo.com/13457383) [vimeo.com] Now that we have such awesome viscosity controls, maybe the capability is there…