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Description
Direct numerical simulations (DNS) are performed by our in-house flow solver INCA (www.inca-cfd.com)(Başkaya et al., Computers & Fluids, 2024) over a 15 degree compression ramp undergoing ablation at Mach 8. The setup is validated against experiments and simulations that considered the laminar flow over an inert ramp. Streamwise vortices, which generate heating-cooling streaks through the lift-up effect, are introduced by perturbing the base flow. The ramp is then replaced by a low-temperature ablator, camphor, in our DNS and the interaction of the streaks with the recessing ablator surface is examined. We present the first findings regarding the influence of ablation on the perturbation evolution and transition to turbulence for this configuration. Effect of the ablation products being blown into the boundary layer, the recession speed-up factor, the type of surface balances employed, and the recession patterns are discussed. We investigate the destabilization of the flow due to recession and further investigate pattern formations for higher amplitude perturbations.
