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COBEM 2019
25th International Congress of Mechanical Engineering
A COMPARISON OF HYBRID URANS-LES TURBULENCE MODELS FOR THE COMPUTATION OF THE FLOW AROUND A TRIANGULAR BLUFF BODY
Submission Author:
Alex José Elias , MG
Co-Authors:
Alex José Elias, Aristeu Silveira Neto, João Marcelo Vedovotto
Presenter: Alex José Elias
doi://10.26678/ABCM.COBEM2019.COB2019-1549
Abstract
This paper presents a comparison of Large Eddy Simulation (LES) and Unsteady Reynolds-Averaged Navier- Stokes (URANS) based on the Spalart-Allmaras (SA) turbulence closure model versus two hybrid URANS-LES method- ologies, also based on the SA model: the Detached-Eddy Simulation (SA-DES) and Scale-Adaptive Simulation (SA-SAS). The hybrid methodologies were implemented in the MFSim code, developed in the Laboratório de Mecânica dos Fluidos of the Universidade Federal de Uberlândia in partnership with PETROBRAS. The models performance were assessed in the Volvo burner, wich features the canonical configuration of a bluff-body stabilized premixed flame. The studies on this configuration were carried out experimentally under the Volvo Flygmotor AB program. In order to compare the different turbulent closure models, only the non-reacting case is considered in this study. The benefits of this selection are twofold: it allows us to ignore the combustion, while it presents a characteristic vortex shedding in the wake behind the bluff body, wich is interesting to perform the models comparison. Preliminar results from all models show good agreement with experimental data. In particular, the SA-SAS model presents great potential of use within the MFSim code, since it does not have explicit dependence of the computational mesh like DES models.
Keywords
hybrid URANS-LES, DES, SAS, bluff body
