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Dynamics of swept shock-wave/turbulent-boundary-layer interactions

Event Type: 
Date and Time: 
Friday, November 1, 2019 - 16:30
CTR Conference Room 103
Event Sponsor: 
Parviz Moin, Director of Center for Turbulence Research
Dr. Michael Adler

Swept shock-wave/turbulent-boundary-layer interactions (STBLIs) exhibit key dynamical differences from their spanwise-homogeneous counterparts, including the suppression of a dominant mechanism of low-frequency unsteadiness. An extensive database of wall-resolved simulations is constructed to examine the differences between the properties of spanwise-homogeneous, swept, and compound swept interaction classes. A novel method for calculating the dynamic linear response of these unsteady flows is also presented, which allows for the identification and characterization of absolute instabilities in the time-resolved turbulent flow, and the ramifications for STBLI dynamics are discussed. The spanwise homogeneous interaction exhibits an absolute instability that is well-correlated with the prominent band of low-frequency unsteadiness, whereas an absolute instability is not present in the simple swept interaction, which exhibits a muted low-frequency band. Further, a relationship between interaction symmetry, separation topology, and low-frequency unsteadiness is described, in which the prominent low-frequency unsteadiness is spatially associated with surface-flow singular points that function to topologically close the separation. For swept interactions, the ramifications of quasi-conical interaction symmetry on the frequency scaling of the shear layer bands are also discussed. In essence, the shear layers of the swept interactions exhibit a mix between classical and conical free-interaction scaling in both mean flow and frequency content.

Dr. Michael Adler received his PhD in Aeronautical and Astronautical Engineering from The Ohio State University in 2019, where his research examined many aspects of shock-wave/turbulent-boundary-layer interactions with Prof. Datta Gaitonde. He has recently joined CTR as a postdoctoral fellow and works with Prof. Sanjiva Lele on numerical methods for shock/material-interface interactions and elastic-plastic flow phenomena, including the Richtmyer-Meshkov and other instabilities of elastic-plastic flows.