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. 2016 Mar 15;6:22257. doi: 10.1038/srep22257

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Copyright © 2016, Macmillan Publishers Limited

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Sketches of the whole brush, corresponding to (a) Wi = 91, (b) Wi = 418 and (c) Wi = 588. In (a) the brush surface is basically flat, in (b) the surface is modulated by a travelling wave with λ ~ L_x = 30, ν = 0.077 and b = 1.18 while in (c) the brush filaments tilt but no surface waves are present. In snapshot (d) a larger studied systems (L_x = 180, L_y = 5 and L_z = 150) exhibits a surface wave with multiple crests of wavelength L_x/2 ≈ 90 (Wi = 340). We show the central box (in red) and the two nearest replicas (in grey) to highlight the periodic nature of the waves.