Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
Large Eddy Simulation of Supersonic Jet Flow Using Low Order Spatial Discretization Schemes
Submission Author:
Carlos Alberto Junqueira Junior , SP
Co-Authors:
Sami Yamouni, João Luiz F. Azevedo, William Wolf
Presenter: Carlos Alberto Junqueira Junior
doi://10.26678/ABCM.ENCIT2016.CIT2016-0193
Abstract
New acoustics design constraints have encouraged the recent studies of aeroacoustics fields around compressible jet flows. High-order spatial discretization have been used with success by the scientific community on study large eddy simulations of such flow configuration. Instituto de Aeronáutica e Espaço (IAE) in Brazil is interested in this approach for rocket design applications. Therefore, the current work addresses the numerical study of unsteady turbulent compressible jet flows. More specifically on the effects of second-order spatial discretization and subgrid scale models on compressible large eddy simulation. A novel tool is developed in order to reproduce high fidelity results of compressible jet flows. The numerical solver is an upgrade of a Reynolds-averaged Navier-Stokes developed by the research group. Generally, large eddy simulations demands very refined meshes. Hence, high performance computing is a requirement for such simulations. Therefore, the original framework is rewritten in a modern fashion and parallel computation capabilities have been added to the code. The communication between processors are performed by message passing interface protocols. The CFD general notation system is also included in the numerical tool. The large eddy simulation formulation is written using the finite difference approach. Inviscid numerical fluxes are calculated using a second-order accuratecentered scheme with the explicit addition of artificial dissipation. The viscous fluxes are calculated using a second-order centered scheme. A five steps second-order accurate Runge-Kutta is the chosen time marching method. The energy equation is carefully discretized in order to model the energy equation of the filtered Navier-Stokes formulation. The static Smagorinsky, the dynamic Smagorinsky and the Vreman subgrid closures are compared for the present work. Numerical simulation of a perfectly expanded jet are performed and compared with the literature in order to validate the new solver.
Keywords
Large Eddy Simulations, Compressible Jet Flows, Subgrid Scale Models
