Vatsal Sanjay @comphy-lab.org · Feb 22 Near rebound, a Worthington jet forms within the retracting drop and induces a second force peak. Its amplitude depends on viscosity, impact speed, and surface tension, linking inertial flow focusing to capillarity and viscous dissipation.
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At moderate impact velocities and low viscosity, a singular flow focusing causes the second peak to exceed the first. This narrow ‘island’ vanishes if viscosity grows or if the impact is too energetic, quenching the focused jet.