Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
Dynamic Mode Decomposition Applied to the Study of a High Reynolds Number Supersonic Jet Flow
Submission Author:
Sami Yamouni , SP
Co-Authors:
Carlos Alberto Junqueira Junior, João Luiz F. Azevedo, William Wolf
Presenter: Sami Yamouni
doi://10.26678/ABCM.ENCIT2016.CIT2016-0303
Abstract
Current design constraints have encouraged the studies of aeroacoustic fields around compressible jet flows. The present work addresses the numerical study of turbulence modeling of unsteady turbulent jet flows for aeroacoustic analyses of main engine rocket plumes. A novel large eddy simulation (LES) tool has been developed in order to reproduce high fidelity results of compressible jet flows which could be used for aeroacoustic studies with the Ffowcs Williams and Hawkings approach. The large eddy simulation formulation is written using the finite difference approach. The energy equation is carefully discretized in order to model the energy equation of the filtered Navier-Stokes formulation. The classical Smagorinsky model, the dynamic Smagorinsky model and the Vreman model are the subgrid scale closures selected for the present work. Numerical simulations of perfectly expanded jets are performed and the results are compared with the literature in order to validate the present implementations. The effects of the different subgrid closures available in the solver are discussed. Morever, dynamic mode decomposition (DMD) of each configuration is applied to identify the contribution of the structures associated to a single frequency on the acoustic directivity. Finally, the jet flow is reconstructed using the most relevant DMD modes, and is compared with the unsteady flow results obtained previously.
Keywords
LES, Supersonic jet, DMD, CFD
