Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
A numerical model of a thermal boundary layer
Submission Author:
Gilberto Augusto Amado Moreira , PB
Presenter: Gilberto Augusto Amado Moreira
doi://10.26678/ABCM.ENCIT2016.CIT2016-0276
Abstract
The interaction between the atmosphere and Earth's surface influences the dynamic exchange processes, heat, water vapor and pollutants, determining what is known as the planetary boundary layer (PBL), these processes affect the dynamics and thermodynamic characteristics of the region where there. The flow in PBL exhibit fundamental differences depending on the combination between the stream shear forces and axial forces. This study aimed to verify and evaluate a CFD methodology for the commercial code CFX 12.0, robust and able to simulate the main features of a convective PBL. With this goal was numerically modeled the experiment conducted by Fedorovich et al. in a wind tunnel able to simulate a convective PBL evolving horizontally and bounded by an inversion temperature. A mesh sensitivity study was conducted to determine the appropriate parameters for this type of simulation, furthermore four turbulence models were evaluated: RNGKE (Renormalization Group k-ε), SST (Shear Stress Transport), SSGRS (Speziale-Sarkar-Gatski Reynolds Stress) and BSLRS (Baseline Reynolds Stress). The results showed that the proposed methodology is able to simulate the main qualitative and quantitative characteristics of a PBL and its development over a horizontal section. The study indicates that the BSLRS turbulence model, though require more computational effort is the most suitable for the simulation of this type of flow.
Keywords
atmospheric boundary layer, Natural Convection, Computational Fluid Mechanics, atmospheric boundary layer, Natural Convection, Computational Fluid Mechanics
