Simulation of non-stationary anisotropic capillary wave turbulence within the framework of the kinetic equation

In the present work, numerical simulation of the evolution of capillary turbulence was performed on the basis of the wave kinetic equation taking into account energy dissipation at small scales. For an isotropic initial condition, the simulation results reproduce the Zakharov--Filonenko power-law turbulence spectrum for the wave action, \(n_k ~ k-17/4\). The main result of the work is the calculation of the evolution for a substantially anisotropic initial condition. The numerical data indicate that, during the evolution of an anisotropic wave-action distribution, a factorized spectrum \(n(k,ϕ) ~ k-17/4F(ϕ)\) is formed in polar coordinates \((k,ϕ)\), where \(F(ϕ)\) is a function of the angle in Fourier space. In the regime of a steady power-law distribution in \(k\), the calculated collision integral vanishes with high accuracy in the inertial interval of wavenumbers (the region of the power-law spectrum). Thus, the work provides evidence for the realization of a new strongly anisotropic turbulence spectrum, similar to Kolmogorov--Zakharov spectra.