Simulation of a turbulent, dusty boundary layer behind a shock

Abstract

A direct numerical simulation was made of the turbulent boundary formed by a planar shock propagating along a dusty wall. It differs from previous studies in two respects: (1) it follows the dynamic evolution of the unstable flow without resorting to turbulence modeling; (2) the entrainment of dust into the turbulent boundary layer is included as a part of the computational flow field, thus eliminating the need for a dust scouring model. The calculated mean‐flow profiles, boundary layer growth and dust scouring rate agree with shock tube measurements. In contrast with clean boundary layers, the turbulent fluctuations near the wall were larger than the mean values, as a consequence of dust mass.