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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Boundary layer analysis of turbulence-radiation interaction in a non-reactive channel flow
Submission Author:
Francis França , RS , Brazil
Co-Authors:
Guilherme Crivelli Fraga, Adriane Prisco Petry, Francis França
Presenter: Guilherme Crivelli Fraga
doi://10.26678/ABCM.COBEM2017.COB17-1266
Abstract
This paper presents a continuation of an analysis on turbulence-radiation interaction (TRI) effects in a nonreacting channel flow of a homogeneous participating gas. It is investigated the behavior of the relative difference between the mean volumetric radiative heat source obtained by solutions considering and neglecting TRI effects, which, in a previous study, was observed to have an almost totally smooth three-dimensional field, interrupted by a few points where the local difference rose abruptly to values exceptionally high. To obtain the data for the analysis, simulations are conducted in the open-source code Fire Dynamics Simulator, using Large Eddy Simulation to generate transient fields of the quantities of interest. Results show that the points of maximum of the difference are attributed to the local mean radiative heat source approaching zero in a region of relative coarse spatial discretization. In a second part of the study, seeing that the points of spike in the difference are located near the domain walls, TRI effects inside the thermal boundary layer are investigated, from which it is found that all points of maximum are located inside that layer. When only the region outside of the boundary layer is considered, a totally smooth field of the relative difference is obtained, with domain-averaged values of the difference agreeing with what is expected from the literature.
Keywords
Turbulence-radiation interaction, Boundary Layer, Large Eddy Simulation, Fire Dynamics Simulator
