UNIVERSAL SCALING EXPONENTS IN SHELL MODELS OF TURBULENCE - VISCOUS EFFECTS ARE FINITE-SIZED CORRECTIONS TO SCALING

In a series of recent works it was proposed that shell models of turbu lence exhibit inertial range scaling exponents that depend on the natu re of the dissipative mechanism. If true, and if one could imply a sim ilar phenomenon to Navier-Stokes turbulence, this finding would cast s trong doubts on the universality of scaling in turbulence. In this Let ter we propose that these ''nonuniversalities'' are just corrections t o scaling that disappear when the Reynolds number goes to infinity. [S 0031-9007(98)06693-9].