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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
The Effect of the Smagorinsky Constant on LES of Coaxial Turbulent Jets
Submission Author:
Jean Pinho , SC
Co-Authors:
Jean Pinho
Presenter: Jean Pinho
doi://10.26678/ABCM.ENCIT2020.CIT20-0460
Abstract
Large Eddy Simulation (LES) is an efficient technique to simulate turbulent flows of practical interest, based on the elimination of flow scales smaller than a characteristic length and direct resolution of the largest scales. The effect of subgrid-scales is often described by a subgrid viscosity, also called eddy viscosity. The Smagorinsky subgrid model is frequently used to describe the eddy viscosity in the literature, presenting good results for a variety of flows. However, the use of this model requires the choice of a value for the Smagorinsky constant, which has no universal value, and depends on characteristics of the flow and even on details of the numerical solver. In this work, we studied the effect of the Smagorinsky constant used in the LES of turbulent coaxial jets using a GPU-based solver called PMLES, comparing the results with experimental data available in the literature. Our results demonstrate that the use of inadequate values of this constant, even within the range recommended by the literature, can result in simulations that are far from reality.
Keywords
Subgrid Scale Models, LES, Numerical simulation, Coaxial Jets, Turbulence
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