Guilherme Sausen Welter

Statistical Analysis of Wind Tunnel and Atmospheric Boundary Layer Turbulent Flows

Many studies on wind engineering require the use of different types of statistical analysis associated to the phenomenology of boundary layer flows. Reduced Scale Models (RSM) ob‐ tained in laboratory, for example, attempt to reproduce real atmosphere phenomena like wind loads on buildings and bridges and the transportation of gases and airborne particu‐ lates by the mean flow and turbulent mixing. Therefore, the quality of the RSM depends on the proper selection of statistical parameters and in the similarity between the laboratory generated flow and the atmospheric flow.

ESPECTROS DE TURBULÊNCIA MEDIDOS NA CAMADA ATMOSFÉRICA SUPERFICIAL E EM UM TÚNEL DE VENTO DE CAMADA LIMITE

Espectros de turbulencia medidos na camada atmosfericasuperficial e em um tunel de vento de camada limite

AVALIAÇÃO DA ESCALA DE TEMPO EM TÚNEIS DE VENTO COM BASE NA ANÁLISE ESPECTRAL E OS CRITÉRIOS DE SEMELHANÇA

A methodology based on spectral comparisons to evaluate the time scale factor in wind tunnel tests is proposed. Obtained results shown a significant dependency of these parameters with the gust duration time. This behavior must be considered when the quasistatic approach is used to evaluate wind loads by means of peak coefficients.

DISTRIBUIÇÕES DE PROBABILIDADE DAS FLUTUAÇÕES DE VELOCIDADE E CONCENTRAÇÃO NOS PROCESSOS DE DISPERSÃO DE POLUENTES

Testes na atmosfera e num tunel de camada limite foram realizadospara avaliar o comportamento probabilistico das flutuacoes de velocidadee concentracao associadas a um processo de dispersao. Distribuicoesproximas a Gaussiana foram obtidas na analise das velocidades.Para as flutuacoes de concentracao, diferentes comportamentos podemser determinados, conforme a regiao do campo das concentracoes analisada.

SIMULAÇÃO DOS GRANDES TURBILHÕES APLICADA AO CICLO DIÁRIO DA CAMADA LIMITE PLANETÁRIA - PARTE 1

In this work, some preliminary results on the ability of a largeeddy simulation model (LES) to describe the planetary boundary layerare presented. The performed simulation was initialized with verticalprofiles and surface data obtained experimentally and from a regionalmodel. Fally, the simulation results are compared with experimental datain order to verify the evolution of the simulated variables in relation tothe observed ones.