Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL AND EXPERIMENTAL STUDY OF THE GENERATION OF ATMOSPHERIC BOUNDARY LAYER PROFILE IN WIND TUNNEL
Submission Author:
Pollyana de Lima Massari , RJ
Co-Authors:
Marcos Sebastião de Paula Gomes, Maria Helena Farias, Renan de Souza Teixeira
Presenter: Pollyana de Lima Massari
doi://10.26678/ABCM.ENCIT2016.CIT2016-0513
Abstract
Atmospheric wind tunnels are widely used in studies related to pollution dispersion, structural behavior in civil engineering, architectural aerodynamics and other applications. Atmospheric boundary layer (ABL) flows are specifically generated in wind tunnels to reproduce real wind profile conditions, and facilities for performing such experimental simulations are generally known as ‘‘boundary layer wind tunnels (BLWT)’’. In BLWT, a considerable thick boundary layer velocity profile and turbulence levels are produced to simulate an atmospheric boundary layer. The method to create the desired atmospheric features consists in adding appropriate devices at the entrance of the test section, such as grids, barriers, fences, spires and cubical roughness elements, in order to develop and increase the boundary layer height along certain wind tunnel length. This paper presents the design, experimental tests and computational simulation of different ABL configurations, which will be used in the atmospheric wind tunnel of the Brazilian National Institute of Metrology, Quality and Technology (Inmetro). Computational simulations, in OpenFOAM software, will be performed to compare the experimental data with numerical results and to evaluate the optimal spires set configurations. Several ABL simulations methods are available in literature. The method considered in this study is the Irwin Method. This scheme consists of a set of empirical formulas for spires design, which concerns about the type of terrain (such as oceanic, hills, urban, among others) and is driven basically by two characteristics: the thickness of the boundary layer and the power law exponent profile. These formulas consider a uniform velocity profile in the wind tunnel inlet. Nevertheless, Inmetro’s atmospheric wind tunnel produces non-uniform profiles for some velocities. Therefore, numerical and experimental study will be performed to evaluate the efficiency of this method in non-uniform velocity profile conditions.
Keywords
atmospheric boundary layer, Experimental Study, Computational simulation, Wind Tunnel, spires, atmospheric boundary layer, Experimental Study, Computational simulation, Wind Tunnel, spires, atmospheric boundary layer, Experimental Study, Computational simulation, Wind Tunnel, spires, atmospheric boundary layer, Experimental Study, Computational simulation, Wind Tunnel, spires
