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ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL SIMULATIONS OF GASEOUS COMPOUND DISPERSION AROUND A CUBIC OBSTACLE UNDER DIFFERENT ATMOSPHERIC STABILITY CONDITIONS: USE OF κ-ω SST TURBULENCE MODELLING
Submission Author:
Bruno Furieri , ES
Co-Authors:
ISRAEL COSTA, Neyval Reis, jane meri Santos, Harerton Dourado
Presenter: ISRAEL COSTA
doi://10.26678/ABCM.ENCIT2016.CIT2016-0181
Abstract
Wind flow and dispersion of gaseous emissions in the near wake of an isolated cubic building under stable, neutral and unstable atmosphere conditions were investigated using the k-omega SST turbulence modelling. Generally, RANS turbulence models overestimate the length of the recirculation zone downstream of a building. This is significantly affected by the turbulent kinetic energy production at the stagnation zone. In order to control this deficiency, the Production Limiter function (implemented in Ansys Fluent) was employed, with the purpose of restricting the turbulent kinetic energy production term. It allows a reduction in turbulence viscosity level and improves the prediction of separation zones. The numerical results were compared with wind tunnel experiments carried out by Yassin (2013). The Richardson bulk (
Keywords
atmospheric dispersion, Turbulence, CFD, k-omega SST
