Lessons Learned from a Model Validation Study in High-speed Aerodynamics

Abstract

Model validation studies are becoming increasingly relevant when investigating complex flow problems in high-speed aerodynamics. This paper presents the lessons learned from the practical aspects of a joint experimental-computational investigation, aimed at validating the quadratic constitutive relation in Mach 2.5 corner flows. Several instructive insights were gained from the careful, additional quantitative tests performed to obtain high-quality experimental data and to eliminate any systematic errors. In particular, the importance of identifying implicit assumptions in the methodology is demonstrated, quantitative evaluation of computations in the overall flowfield is shown to be crucial, and the benefits of a closely integrated experimental-computational approach are highlighted. For instance, this type of close collaboration enabled a better understanding of measurement techniques, helped to improve the infrastructure of the facility, and resulted in the discoveries of bulk secondary flows and streamwise vortices within the sidewall boundary layers.