Fluid Ablation Interactions on a Compression Ramp at Mach 8

Direct numerical simulations (DNS) are performed over 15° compression ramp undergoing ablation at Mach 8 to examine fluid-ablation interactions (FAI) on transitional high-speed boundary layers. The experiments at these conditions with a rigid wall are first numerically replicated for a laminar flow. Heating streaks are introduced by perturbing the flow. The ramp is then replaced by a low-temperature ablator in our DNS. The interaction of the streaks with the recessing ablator surface is then examined. Different approaches from two independently developed solvers are used to explore the problem. Differences in streak amplification and mass blowing magnitudes are observed between the results. We discuss the difficulties in accurately predicting ablation and present the first findings regarding its influence on the perturbation evolution and transition to turbulence for this configuration.