Abstract: This talk presents numerical approaches for investigating turbulence in the Atmospheric Boundary Layer (ABL), with emphasis on large-scale coherent structures. Traditional Large-Eddy Simulation (LES) struggles near the wall due to the wide range of scales involved. To address this, we introduce the multicell-LES-ODT model, which couples LES with the One-Dimensional Turbulence (ODT) model to enhance near-wall resolution and improve turbulence statistics. We also explore Resolvent Analysis (RA) as a low-cost alternative for identifying coherent structures based on the mean flow and linearized Navier-Stokes equations. By comparing RA results with Spectral Proper Orthogonal Decomposition (SPOD) of LES data, we assess its effectiveness. Together, multicell-LES-ODT and RA offer complementary insights into ABL turbulence, balancing detailed simulation with analytical understanding.
Bio: Livia S. Freire is an Assistant Professor at the Institute of Mathematics and Computer Sciences of the University of São Paulo (ICMC/USP, Brazil). She holds a Bachelor’s degree in Environmental Engineering from the Federal University of Paraná (Brazil) and a Ph.D. in Meteorology from the Pennsylvania State University (USA). As a member of the Computational Fluid Dynamics group at ICMC/USP, her research focuses on Geophysical Fluid Mechanics and Turbulence, with an emphasis on Atmospheric Turbulence. Her work primarily involves the development of models for the atmospheric boundary layer and other turbulent flows, along with the measurement and statistical analysis of atmospheric turbulence data. She is a member of the American Meteorological Society’s Committee on Boundary Layers and Turbulence, and serves on the editorial board of Agricultural and Forest Meteorology.
https://freirelivia.gitlab.io
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