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COBEM 2019
25th International Congress of Mechanical Engineering
Comparison Between Two and Three-Dimensional Direct Numerical Simulations of Rossiter Modes in Open Cavity Flow
Submission Author:
Marlon Sproesser Mathias , SP
Co-Authors:
Marlon Sproesser Mathias
Presenter: Marcello Augusto Faraco de Medeiros
doi://10.26678/ABCM.COBEM2019.COB2019-0712
Abstract
We simulate a compressible flow in an open cavity using our Direct Numerical Simulation code (DNS) in both two and three-dimensional setups. Our goal is to measure the effects of three-dimensional phenomena, such as centrifugal instabilities, over the essentially two-dimensional Rossiter modes. An open cavity flow is set up so that both types of modes are present. The flow is simulated until it's well developed. When three-dimensional effects are included, a different Rossiter mode becomes the dominant in the flow. Centrifugal modes can also be observed by looking at the temporal spectrum, which matches our linear predictions. The goal is to understand the limitations and applicability of the much cheaper two-dimensional simulations both on linear and non-linear analysis.
Keywords
direct numerical simulation, Rossiter modes, Centrifugal instability, Open cavity flow
