Direct Numerical Simulation of Very-Large-Scale Motions in Turbulent Pipe Flow

The study focuses on the interaction between turbulent superstructures, known as very-large-scale motions (VLSMs), and small-scale wall turbulence, utilizing direct numerical simulation. It examines shear stress Reynolds numbers up to Re = 2880 and pipe lengths up to L = 42R. The research analyzes the convergence and scaling behavior of various statistical moments of the velocity distribution and discusses energy transfer mechanisms between VLSMs and the mean flow, enhancing understanding of turbulent pipe flow dynamics and the inverse turbulent energy cascade phenomenon.