A spectacular example of free surface flow is the impact of a solid object on a liquid. At impact a “crown” splash is created and a surface cavity (void) emerges which immediately starts to collapse due to the hydrostatic pressure of the surrounding liquid. Eventually the cavity closes in a single point about halfway down its length and shoots out a fast and extremely slender water jet. Here we impact thin circular discs a few centimeters in radius with velocities of a few meters per second. Combining high-speed imaging with sophisticated boundary-integral simulations we elucidate various aspects of this fascinating process.
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