JETP Letters

, Volume 93, Issue 4, pp 195–198 | Cite as

Numerical study of Fermi-Pasta-Ulam recurrence for water waves over finite depth

  • V. P. Ruban
Plasma, Hydro- and Gas Dynamics


Highly accurate direct numerical simulations have been performed for two-dimensional free-surface potential flows of an ideal incompressible fluid over a constant depth h, in the gravity field g. In each numerical experiment, at t = 0 the free surface profile was in the form y = A 0cos(2πx/L), and the velocity field v = 0. The computations demonstrate the phenomenon of Fermi-Pasta-Ulam (FPU) recurrence takes place in such systems for moderate initial wave amplitudes A 0 ≲ 0.12h and spatial periods at least L ≲ 120h. The time of recurrence T FPU is well fitted by the formula T FPU(g/h)1/2 ≈ 0.16(L/h)2(h/A 0)1/2.


Soliton JETP Letter Water Wave Spatial Period Shallow Water Wave 
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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  1. 1.Landau Institute for Theoretical PhysicsRussian Academy of SciencesMoscowRussia

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