  The effects of different filtering strategies on the statistical properties
of the resolved-to-sub-filter scale (SFS) energy transfer are analyzed in
forced homogeneous and isotropic turbulence. We carry out a priori analyses of
statistical characteristics of SFS energy transfer by filtering data obtained
from direct numerical simulations (DNS) with up to $2048^3$ grid points as a
function of the filter cutoff scale. In order to quantify the dependence of
extreme events and anomalous scaling on the filter, we compare a sharp Fourier
Galerkin projector, a Gaussian filter and a novel class of Galerkin projectors
with non-sharp spectral filter profiles. Of interest is the importance of
Galilean invariance and we confirm that local SFS energy transfer displays
intermittency scaling in both skewness and flatness as a function of the cutoff
scale. Furthermore, we quantify the robustness of scaling as a function of the
filtering type.
