Abstract
Three-dimensional Rayleigh-Taylor incompressible turbulence is numerically studied with the Boussinesq approximation. Our focus is on scaling properties of the moments of the density and the velocity differences (structure functions), which are directly measured from the numerical data. A comparison with the phenomenology proposed by Chertkov [Phys. Rev. Lett. 91, 115001 (2003)] is made. It is found that deviation from the phenomenology (anomalous scaling or intermittency effect) of the density observed for high-order structure functions is quite close to that of the passive scalar with a uniform mean scalar gradient advected by the barotropic homogeneous isotropic turbulence.
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