INTERMITTENCY OF 2-DIMENSIONAL DECAYING TURBULENCE

In this letter we investigate the scaling properties of two-dimensiona l decaying turbulence by direct numerical simulations using smooth ini tial conditions. We present preliminary results concerning the intermi ttency related to fluctuations in the enstrophy dissipation and to the scaling exponents of the vorticity structure functions. The scaling p roperties of enstrophy dissipation show multifractal behaviour while t he scaling exponents of the n-order vorticity structure functions are linear in n. A theoretical interpretation of these results is proposed .