EPTT 2020

12th Spring School on Transition and Turbulence

Influence of span-wise periodicity on the linear stability of Rossiter modes in an open cavity

Submission Author: Marlon Sproesser Mathias , SP
Co-Authors: Marlon Sproesser Mathias, Marcello Augusto Faraco de Medeiros
Presenter: Marlon Sproesser Mathias

doi://10.26678/ABCM.EPTT2020.EPT20-0029

 

Abstract

We have used the Linear Stability Theory (LST) to compute the bi-global modes of a subsonic compressible flow over an open rectangular cavity to map how the instability of these modes vary with the span-wise period length of the domain. An infinite-length domain represents the 2D case, which is ideal for the Rossiter modes. As the domain becomes shorter, 3D effects become stronger, which causes these modes to become less unstable. We attribute this decreased instability to destructive interference in the acoustic feedback mechanism as the domain becomes narrower.

Keywords

Biglobal stability analysis, Rossiter modes, Open cavity flow, compressible subsonic flow

 

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