77th Annual Meeting of the APS Division of Fluid Dynamics (November 24, 2024 — November 26, 2024)

V2685340: Direct numerical simulation of supersonic turbulent boundary layers over rough surfaces

Authors

• Michele Cogo, University of Padova
• Davide Modesti, Delft University of Technology
• Matteo Bernardini, Department of Mechanical and Aerospace Engineering, Sapienza University of Rome, Rome, Italy
• Francesco Picano, University of Padova

DOI: https://doi.org/10.1103/APS.DFD.2024.GFM.V2685340

Surface roughness effects can significantly alter the mechanical and thermal loads on high-speed vehicles. Different surface treatments can lead to formation of hydraulically smooth and rough walls next to each other, to which the incoming flow is forced to adjust. We present here flow animations from direct numerical simulations of smooth and rough zero-pressure-gradient adiabatic turbulent boundary layers at freestream Mach number M = 2 and friction Reynolds number up to Re=1700, performed using 256 graphical processing units. The interaction between compressibility and surface roughness, clearly visible with a pattern of local distortions, is visualized using the density field for different roughness geometries, such as aligned and staggered 3D cubes, and diamond-shaped elements.