Compressibility and wall-cooling effects on high-speed turbulent boundary layers

–

Compressibility and wall-cooling effects on high-speed turbulent boundary layers

Michele Cogo, Mauro Chinappi, Matteo Bernardini, Francesco Picano

Abstract. Flight systems operating at high speeds are frequently enveloped by turbulent, hot, highly compressible flow experiencing various regimes in terms of Mach numbers and surface temperature. These factors are dominant in the proximity of the surface, the boundary layer, posing technical difficulties in predicting the mechanical and thermal loads. In this work, we analyze a database of Direct numerical Simulations of turbulent boundary layers for Mach numbers 2, 4 and 6 and four different wall temperatures (from adiabatic to cold wall). We discuss the choice of the diabatic parameter to define the degree of wall-cooling across different Mach numbers, observing its influence on instantaneous fields and first-second order velocity and temperature statistics.

Keywords
Compressible Boundary Layers, Turbulent Boundary Layers

Published online 6/1/2024, 4 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Michele Cogo, Mauro Chinappi, Matteo Bernardini, Francesco Picano, Compressibility and wall-cooling effects on high-speed turbulent boundary layers, Materials Research Proceedings, Vol. 42, pp 14-17, 2024

DOI: https://doi.org/10.21741/9781644903193-4

The article was published as article 4 of the book Aerospace Science and Engineering

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

References
[1] Zhang, Y. S., Bi, W. T., Hussain, F., & She, Z. S. (2014). A generalized Reynolds analogy for compressible wall-bounded turbulent flows. Journal of Fluid Mechanics, 739, 392-420. https://doi.org/10.1017/jfm.2013.620
[2] M. Bernardini, D. Modesti, F. Salvadore, S. Sathyanarayana, G. Della Posta, and S. Pirozzoli. Streams-2.0: Supersonic turbulent accelerated navier-stokes solver version 2.0. Comput. Phys. Commun., 285:108644, 2023. https://doi.org/10.1016/j.cpc.2022.108644
[3] Cogo, M., Salvadore, F., Picano, F., & Bernardini, M. (2022). Direct numerical simulation of supersonic and hypersonic turbulent boundary layers at moderate-high Reynolds numbers and isothermal wall condition. Journal of Fluid Mechanics, 945, A30. https://doi.org/10.1017/jfm.2022.574
[4] Cogo M, Baù U, Chinappi M, Bernardini M, Picano F. Assessment of heat transfer and Mach number effects on high-speed turbulent boundary layers. Journal of Fluid Mechanics. 2023;974:A10. https://doi.org/10.1017/jfm.2023.791
[5] T. B. Gatski and J. P. Bonnet. Compressibility, turbulence and high speed flow. Academic
Press, 2013.
[6] Morkovin, M.V. 1962 Effects of compressibility on turbulent flows. Méc. Turbul. 367(380),26