Turbulent kinetic energy spectra, as measured by the non-radial component of the velocity. The top panel shows 2D and 3D spectra for s15, and the bottom panel displays the same for s27. The E _ℓ are averaged over a 10 km wide shell, centered on a radius of 125 km, and over 10 ms, centered at 150 ms postbounce. In all cases, 2D simulations result in much greater kinetic energy density on large scales than 3D. Kinetic energy on large scales has been suggested to be conducive to explosion (Hanke et al. 2012).