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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 , São Paulo
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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