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SUMMARY:Interactions of shock waves and turbulence through high-fidelity n
 umerical simulations for high-speed flight and propulsion applications - I
 ván Bermejo-Moreno\, USC
DTSTART:20260226T140000Z
DTEND:20260226T150000Z
UID:TALK244795@talks.cam.ac.uk
CONTACT:Anna Walczyk
DESCRIPTION:Hypersonic flight and propulsion pose fundamental challenges t
 hat arise from interactions between shock waves and turbulence. These inte
 ractions can be beneficial\, enhancing the mixing of fuel and oxidizer in 
 a scramjet engine\, but they can also be detrimental\, compromising the in
 tegrity of the flying vehicle through uncontrolled aerothermostructural co
 upling. This presentation will highlight recent developments on the predic
 tion and understanding of these phenomena by means of high-fidelity numeri
 cal simulations. First\, focus will be placed on interactions of shock wav
 es reflecting off turbulent boundary layers that develop along rigid and f
 lexible walls\, by loosely coupling a wall-modeled large-eddy simulation s
 olver for the fluid flow with an elastic solid structural solver that acco
 unts for geometric nonlinearities. Strong shock/boundary-layer interaction
 s will be emphasized\, resulting in mean flow separation and low-frequency
  unsteadiness that can couple with natural frequencies of the solid struct
 ure. Simulation results will be compared with supersonic wind-tunnel exper
 iments. Second\, the enhancement of scalar mixing under canonical shock-tu
 rbulence interactions will be addressed by means of shock-capturing direct
  numerical simulations\, evaluating the effects of the shock and turbulenc
 e Mach numbers\, and the Reynolds number. Statistical analyses will highli
 ght changes along the mean flow direction of scalar variance and dissipati
 on-rate budgets\, flow topology\, and alignments of the scalar gradient wi
 th vorticity and strain-rate eigendirections. A novel methodology to track
  the time evolution of geometric and physical quantities of turbulent flow
  structures will be introduced and applied to study the dynamics of isosca
 lar surfaces across the shock-turbulence interaction
LOCATION:JDB Teaching Room
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