Characteristics of linear modal instabilities in hypersonic flows with detached shock waves

Results in Engineering

Cristina Jimenez¹  José M. Pérez² 

[1] E.T.S.I. Aeronáutica y del Espacio, Universidad Politécnica de Madrid, Pza. Cardenal Cisneros, E-28040, Madrid, Spain;Corresponding author.;

关键词: Hypersonic flow;    Blunt bodies;    Modal analysis;    Reduced-order models;   

DOI  :  

来源: DOAJ

【 摘 要 】

A preliminary study on the linear instabilities present in a defined hypersonic flow over a blunt object is analyzed in this work. Such flow instabilities are defined in the detached shock wave and the defined shock region between the shock wave and the body surface. For this, it will be assumed that a reactive flow in thermal equilibrium.Given the choice of parameters of the problem considered in this work, the simulation’s final state is a steady base flow to which the simulation converges through a transient. The modes present in that transient are calculated using different modal analysis techniques: Proper orthogonal decomposition (POD), dynamic mode decomposition (DMD), and high order DMD (HODMD).These modes will allow the definition of reduced-order models, characterizing the flow with a reduced number of degrees of freedom and developing flow control strategies. In this work, we will focus on the first option, with the aim at obtaining rapid simulation models.These modes and their non-linear combinations can be used in future works as a minimum set of features in optimization processes involving multi-layer neural networks, allowing to model the non-linear effects that appear in the transition from laminar to turbulent flow.

【 授权许可】

Unknown