78th Annual Meeting of the APS Division of Fluid Dynamics (Nov 23 — 25, 2025)

P028: Unraveling Coherent Structures in Subsonic Crossflow-Supersonic Jet Interactions​

Authors
  • Abinayaa Dhanagopal, University of Texas at San Antonio
  • Subhajit Roy , University of Texas at San Antonio
  • Guillermo Araya , University of Texas at San Antonio

The vortex cores (Q-criterion) shown is extracted from high-resolution DNS, revealing how a supersonic jet (Mach 3.73) interacts with a subsonic turbulent crossflow (Mach 0.8) at δ⁺ ≈ 250. These vortical structures illustrate the complex mixing and instability mechanisms that develop at the jet crossflow interface.The snapshots present dominant modes from Proper Orthogonal Decomposition (POD) of the u′ velocity fluctuations. These modes highlight key flow features: shock-cell structures propagating downstream, counter-rotating vortex pairs, and horseshoe vortices forming near the jet base. Modes are presented for both the xy-plane (longitudinal centerline) and the yz-plane (cross-sectional), with three yz sections taken at −1D, 1D, and 5D downstream of the jet exit (where D is the jet diameter).

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