Direct simulations of periodic roughness elements in a Mach 7 turbulent boundary layer

摘要

In this paper we discuss the direct numerical simulation (DNS) of a Mach 7.2 turbulent boundary layer over two dimensional square bar roughness elements. The boundary layer edge conditions and roughness configuration is chosen to match the experiments being performed in the Mach 8 wind tunnel at the Princeton University Gas Dynamics Lab. Here, we present a discussion of the DNS technique and preliminary results. This discussion includes details of the simulation-such as computational mesh generation, flow initialization, numerical method, and boundary treatments-as well as a qualitative discussion of the underlying physics and the challenges they pose to numerical simulation.