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Experiments on the impact of a densely-packed jet of non-cohesive grains ontoa fixed target show that the impact produces an ejecta sheet comprised ofparticles in collimated motion. The ejecta sheet leaves the target at awell-defined angle whose value agrees quantitatively with the sheet angleproduced by water jet impact. Motivated by these experiments, we examine theidealized problem of dense granular jet impact onto a frictionless target intwo dimensions. Numerical results for the velocity and pressure fields withinthe granular jet agree quantitatively with predictions from an exact solutionfor 2D perfect-fluid impact. This correspondence demonstrates that thecontinuum limit controlling the coherent collective motion in dense granularimpact is Euler flow.

Perfect fluid flow from granular jet impact