DEVELOPED TURBULENCE - FROM FULL SIMULATIONS TO FULL MODE REDUCTIONS

Developed Navier-Stokes turbulence is simulated with varying wave-vect or mode reductions. flatness and the skewness of the velocity derivati ve depend on the degree of mode reduction. They show a crossover towar ds the value of the full numerical simulation when the viscous subrang e starts to be resolved. The intermittency corrections of the scaling exponents zeta(p) of the pth order velocity structure functions seem t o depend mainly on the proper resolution of the inertial subrange. Uni versal scaling properties (i.e., independent of the degree of mode red uction) are found for the relative scaling exponents rho(p,q) = (zeta( p) - zeta(3)p/3)/(zeta(q) - zeta(3)q/3).