CRITICAL HYPERSONIC AEROTHERMODYNAMIC PHENOMENA

Review of X-33 Hypersonic Aerodynamic and Aerothermodynamic Development

A review of the experimental and computational studies performed at NASA Langley Research Center (LaRC) to support the optimization and benchmarking of the hypersonic aerodynamic and aerothermodynamic databases for the X-33 vehicle is presented. A synoptic of the testing, computational, and analysis capabilities at LaRC applied to these studies is given. Analyses of the hypersonic aerodynamic c...

Applications of Underexpanded Jets in Hypersonic Aerothermodynamic Research

A method of underexpanded hypersonic viscous jets has been developed to acquire experimental aerodynamic data for wedges and plates in the transitional regime between free-molecular and continuum regimes. The kinetic, viscous, and rotational nonequilibrium quantum processes in the jets of He, Ar, N2, and CO2 under various experimental conditions have been analyzed by asymptotic methods and nume...

Modelling of Hypersonic Flow Phenomena

Forewords Computational Fluid Dynamic is becoming a mature discipline in aerospace sciences. It is no longer only an analysis tool but ready to be used in all stages of design as well. The materials here presented review the growth and advances done in the last 10 years for hypersonic flow phenomena in continuum regime. The status of the physical modelling, code development issues such as algor...

Effects of increasing aerothermodynamic fidelity on hypersonic trajectory optimisation for flight testing purposes

Critical Phenomena in Percolation Theory

In this paper, the critical behavior of the percolation models is reviewed, with emphasis on the scaling laws present and its relationship with other simple models like the Ising magnet. A liitle bit of the history and some examples of its application are given to illustrate the range of phenomena that can be described with such models.