Scaling properties of subgrid-scale energy dissipation

We use direct numerical simulation of forced homogeneous isotropic turbulence with 256(3) and 512(3) grid points and Reynolds number based on Taylor microscale up to 250 to examine a priori the scaling properties of the subgrid-scale kinetic energy and its dissipation rate. It is found that the two quantities are strongly correlated and a power-law scaling assumption holds reasonably well. However, the scaling exponent, which was assumed to be weakly varying in previous studies, is found to change considerably with the filter characteristic width. (C) 2007 American Institute of Physics.