The present work reports on the flow physics of turbulent supersonic flow over backward-facing step at Mach 2 using Large-Eddy Simulation methodology where the dynamic Smagorinsky model is used for subgrid-scale modeling, whereas proper orthogonal decomposition is invoked to identify the coherent structures present in the flow. The mean data obtained through the computations are in good agreement with the experimental measurements, whereas the isosurfaces of -criterion at different time instants show the complex flow structures. The presence of counter-rotating vortex pair in the shear layer along with the complex shock-wave/boundary-layer interaction leading to the separation of boundary layer is also evident from the contours of both and the modulus of vorticity. Further, the proper orthogonal decomposition analysis reveals the presence of coherent structures, where the first and second modes confirm the vortical structures near the step as well as along the shear layer in the downstream region, whereas the second, third, and fourth modes confirm the presence of vortices along the shear layer due to Kelvin–Helmholtz instability. Moreover, proper orthogonal decomposition as well as frequency analysis is extended at different planes to extract the detailed flow features.
Characterization of Turbulent Supersonic Flow over a Backward-Facing Step
AIAA Journal ; 55 , 5 ; 1511-1529
2017-03-29
19 pages
Article (Journal)
Electronic Resource
English
Characterization of Turbulent Supersonic Flow over a Backward-Facing Step
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