Coherent structures and energy cascade in homogeneous turbulence

Abstract

Homogeneous turbulence at high Reynolds numbers consists of the hierarchy of multiplescale coherent vortex tubes. The energy cascade is the process that smaller-scale vortex tubes are created by being stretched in straining regions around larger-scale vortex tubes. Direct numerical simulation of homogeneous turbulence at a sufficiently high Reynolds number is conducted to verify this picture of energy cascade in the inertial range.