Energy-eddies at 4 scales.
Isocontours of high kinetic energy based on the bandpass-filtered velocities at 4
different scales \(\Delta\) for the same instant. \(\Delta\) expressed in terms of the Kolmogorov
length scale η. Forced isotropic turbulence, \(Re_\lambda = 315\), \(k_{\text{max}}\eta = 2\), \(1024^3\) grid.

J.I. Cardesa, A. Vela-Martín and J. Jiménez
"The turbulent cascade in five dimensions"
Science, Vol. 357, 2017
(video)