Past exam of the mathematics course of the University of Cambridge / 2008 / iii / Paper 84 / 4 / c

The K-epsilon turbulence front hasIts characteristic integral length and the specified frequency scale areThe ratio $ϵ/k$ is an inverse eddy-turnover time. The PDF calls it turbulent vorticity, but it should not be identified with the exact root-mean-square vorticity at dissipative scales, which involves molecular viscosity as well.