Characterization of the shear layer in a Mach 3 shock/turbulent boundary layer interaction

1st Multiflow Summer Workshop

Helm, C.^1 ; Martin, M.P.^1 ; Dupont, P.^2

Department of Aerospace Engineering, University of Maryland, College Park, 20742, MD, United States^1

Institut Universitaire des Systèmes Thermiques et Industriels, UMR 7343 CNRS, Aix-Marseille Université, Marseille, France^2

关键词: Characteristic frequencies;    Frequency contents;    Identification of individuals;    Kelvin-helmholtz vortices;    Shock/turbulent boundary-layer interaction;    Similarity solution;    Spatial organization;    Two-dimensional correlation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/506/1/012013/pdf
DOI  :  10.1088/1742-6596/506/1/012013

来源: IOP

【 摘 要 】

A detailed characterization of the shear layer in a direct numerical simulation of a Mach 3, separated shock/turbulent boundary layer interaction over a 24° compression ramp is presented. Similarity solutions are identified in the time-averaged shear layer and the growth of the shear layer is found to be approximately linear. In addition to the time averaged spatial organization of the shear layer, the characteristic frequencies and time scales of the large Kelvin- Helmholtz vortices are determined and are found to be consistent with the energized frequency content in the pre-multiplied power spectra of the wall pressure. The three-dimensional nature of the mixing layer vortices are identified using two-dimensional correlation contour plots and a technique for the identification of individual vortices. The large vortices shed from the separated region are found to lie in a plane parallel to the ramp surface, but angled at ±45° to the freestream direction.