75th Annual Meeting of the APS Division of Fluid Dynamics (November 20, 2022 — November 22, 2022)

V0037: Direct numerical simulation of a micro-ramp in a high-Reynolds number supersonic turbulent boundary layer

Authors

• Francesco Salvadore, HPC Department, CINECA
• Antonio Memmolo, HPC Department, CINECA
• Davide Modesti, Faculty of Aerospace Engineering, Delft University of Technology
• Giacomo Della Posta, Dept. of Mechanical and Aerospace Engineering, University of Rome La Sapienza
• Matteo Bernardini, Dept. of Mechanical and Aerospace Engineering, University of Rome La Sapienza

DOI: https://doi.org/10.1103/APS.DFD.2022.GFM.V0037

Micro-ramps are passive control devices that can be used to counteract the detrimental effects caused by shock-waves/boundary layer interactions in many engineering flows, such as supersonic inlets and transonic wings.  We present here flow animations from direct numerical simulations of a micro-ramp in supersonic turbulent boundary layers at freestream Mach number M = 2 and increasing friction Reynolds number, up to Re = 2000, performed thanks to the power of 1024 graphical processing units. In-situ visualizations made it possible to unravel the complex flow organization around the micro-ramp, such as the formation of lateral counter-rotating vortices merging into the micro-ramp wake and the formation of a fascinating train of vortex rings undergoing an azimuthal instability. These simulations help to clarify how such devices can be used to manipulate supersonic turbulent flows and control boundary layer separation.