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Advances in the Numerical Simulation of Hypersonic Flows

Hypersonic flows have recently re-acquired an important role in fluids research, with many nations interested in their applications. Due to their complexmultidisciplinary aspects, the limitations of recreating them in laboratory experiments and the high cost and uncertainties of flight-testing research vehicles, CFD has assumed a prominent role as a design and analysis tool in this fast-advancing field. This Special Issue aims to capture the strengths that numerical methods can bring to the exploration of this highly challengingmultidisciplinary subject, highlight recent progress, prompt discussions on open questions and become a springboard for future developments. Its scope is novel developments and applications of numerical methods for hypersonic flows, including, but not limited to, rarefied gases, Eulerian and Lagrangian approaches, reacting flows, magneto-hydrodynamics (MHD), finite volume and finite element methods, high-order numerical schemes, numerical stability, and mesh optimisation. Unnikrishnan and Gaitonde present an analytical technique to study the effect of secondary boundary layer instabilities in high-speed flows and a comparison is made to Direct Numerical Simulation (DNS) results. Liu, Cao, Chen, Agarwal, and Zhao describe the coupling of the gas-kinetic scheme (GKS) and two turbulence models, k-ω SST and Langtry-Menter