How drain flies dodge a washout

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Credit: © reproduced from Speirs et al. 2020
The survival of pesky little flies in showers and other wet areas around the house, impervious to water droplets that may be larger than they are, comes down to more than quick reflexes. The insects have evolved a unique coating of hairs that allows them to shrug off water droplets of almost any size, KAUST researchers have shown.
Sigurdur Thoroddsen, who leads the high-speed fluids imaging laboratory at KAUST, couldn't help but take a professional interest in the small drain flies that made a home in his shower and never seemed to wash away. Thoroddsen's research focuses on multiphase flow and dynamics at air-liquid interfaces -- an environment where drain flies have found a niche, despite some risky physics.

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