Amplitude equations and pattern selection in Faraday waves

Details Amplitude equations and pattern selection in Faraday waves Amplitude equations and pattern selection in Faraday waves

1997-02-11

arxiv.org/abs/patt-sol/9702002v1

Phys. Rev. Lett. 79, 2670 (1997).

Nonlinear Sciences

Pattern Formation and Solitons

12 pages, 1 figure, Revtex

Scientific paper

10.1103/PhysRevLett.79.2670

We present a systematic nonlinear theory of pattern selection for parametric surface waves (Faraday waves), not restricted to fluids of low viscosity. A standing wave amplitude equation is derived from the Navier-Stokes equations that is of gradient form. The associated Lyapunov function is calculated for different regular patterns to determine the selected pattern near threshold. For fluids of large viscosity, the selected wave pattern consists of parallel stripes. At lower viscosity, patterns of square symmetry are obtained in the capillary regime (large frequencies). At lower frequencies (the mixed gravity-capillary regime), a sequence of six-fold (hexagonal), eight-fold, ... patterns are predicted. The regions of stability of the various patterns are in quantitative agreement with recent experiments conducted in large aspect ratio systems.

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