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Study on exchanges between earth's surface and atmosphere using Large-Eddy Simulation

Grant number: 18/24284-1
Support type:Research Grants - Young Investigators Grants
Duration: July 01, 2019 - June 30, 2024
Field of knowledge:Physical Sciences and Mathematics - Geosciences
Principal Investigator:Livia Souza Freire Grion
Grantee:Livia Souza Freire Grion
Home Institution: Instituto de Ciências Matemáticas e de Computação (ICMC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Assoc. researchers:Amauri Pereira de Oliveira ; Leandro Franco de Souza
Associated scholarship(s):19/14371-7 - Study on exchanges between Earth's Surface and atmosphere using Large-Eddy Simulation, BP.JP

Abstract

The atmospheric boundary layer (ABL) is the region of the atmosphere closest to the ground, where all exchanges of energy, gases and particles between the earth's surface elements and the atmosphere take place. It is characterized by the presence of a turbulent flow, being better represented computationally by the Large Eddy Simulation (LES) technique. In this type of simulation, the physical processes of the ABL are represented within a three-dimensional domain, allowing not only a detailed study of turbulent transport, but also the validation of simplified models needed for other environmental and meteorological studies. One of the issuesi n using this technique, however, is the representation of turbulence close to the ground; the first grid point of the model is a few meters above the surface due to computational cost, but many important exchanges happen in those first few meters. To this end, this project proposes the use of the One-Dimensional Turbulence (ODT) model for the simulation of surface exchanges within the LES. In the ODT model, the flow is simulated along a line and turbulent transport is represented by a stochastic model. By adding one vertical ODT line within each LES grid closeto the ground, it is possible to simulate instantaneous vertical exchanges between the atmosphere and different surface elements. The project will be divided into two phases: the development and validation of the ODT-LES coupling, and the simulation of different problems of practical interest (e.g., plant canopy emissions, dust and sand transport over desert areas, and flows over urban and wind farm areas). (AU)