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Activity title

Predicting Hypersonic Boundary-Layer Transition on Complex Geometries

Activity Reference

AVT-346

Panel

Applied Vehicle Technology

Security Classification

NATO UNCLASSIFIED

Status

Proposed

Activity type

RTG

Start date

2021

End date

2023

Keywords

Boundary Layer, Experiment, Hypersonics, Simulation, Transition

Background

Hypersonic vehicles offer large potential for improvement in warfighting, since high speed increases survivability, offers a response to counter-stealth technology, and makes them natural for missile defense. Transition is critical to the successful design of these vehicles, since it can have a large effect on aeroheating and aerodynamic controls. Although researchers have been working toward mechanism-based prediction methods, designers are still using empirical methods, and a gap has developed between the two groups that needs to be closed. It appears that additional progress will now be possible by coordinating further international research efforts in a difficult but important area.

Objectives

The proposed Task Group is to facilitate an international collaboration of leading experimentalists and numerical simulation experts towards improved hypersonic prediction capabilities. The simulation approaches will be mechanism-based and the team will use new opportunities for validation in ground facilities.

Topics

Details are supplied in the TOR. Subtasks include (1) transition induced by boundary-layer separation at compression corners, and the prediction of the transitional flows that can occur within and downstream of these separation bubbles, (2) transition due to the interaction of multiple instability modes, (3) second-mode-induced transition that may be controlled using ultrasonically absorbing carbon-carbon thermal protection systems, (4) high enthalpy effects on instability and transition, and (5) ablation effects on transition.

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