Survey of high-speed rough wall boundary layers: Invited presentation

In this invited presentation, a survey of the current database for high-speed roughwall boundary layer is described. The scaling for high-speed rough wall turbulent boundary layers appears to be well correlated with van Driest II theory. Although the available skin friction data appears to reasonably well correlated, the results are mostly limited to adiabatic flows. Kinematic turbulent flow properties collapse onto the incompressible database when plotted with mixed inner and outer scaling and compressibility scaling. Fluctuating thermodynamic properties do not collapse with inner scaling. The limited amount of high-speed turbulence data suggests that as the roughness height was increased, the turbulent production was altered and the boundary layer was populated with smaller scale structures as indicated by the integral time-scales. In summary, the high-speed database is relatively limited compared to low-speed flow. Additional studies of non-adiabatic rough-wall boundary layers that span from incompressible to supersonic flow for a given roughness topology are required. The studies should include skin friction, heat transfer, mean flow and turbulence data.

Survey of high-speed rough wall boundary layers: Invited presentation Conference Paper