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

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 in 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)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CHAMECKI, MARCELO; FREIRE, LIVIA S.; DIAS, NELSON L.; CHEN, BICHENG; DIAS-JUNIOR, CLEO QUARESMA; TOLEDO MACHADO, LUIZ AUGUSTO; SORGEL, MATTHIAS; TSOKANKUNKU, ANYWHERE; DE ARAUJO, ALESSANDRO C.. Effects of Vegetation and Topography on the Boundary Layer Structure above the Amazon Forest. JOURNAL OF THE ATMOSPHERIC SCIENCES, v. 77, n. 8, p. 2941-2957, . (18/24284-1)
FREIRE, LIVIA S.. Large-Eddy Simulation of the Atmospheric Boundary Layer with Near-Wall Resolved Turbulence. BOUNDARY-LAYER METEOROLOGY, v. 184, n. 1, p. 19-pg., . (19/14371-7, 18/24284-1, 13/07375-0)
BAPPY, MEHEDI H.; CARRICA, PABLO M.; VELA-MARTIN, ALBERTO; FREIRE, LIVIA S.; BUSCAGLIA, GUSTAVO C.. Pressure statistics of gas nuclei in homogeneous isotropic turbulence with an application to cavitation inception. Physics of Fluids, v. 32, n. 9, p. 13-pg., . (18/08752-5, 18/24284-1)
PARK, HYUNGWON JOHN; SHERMAN, THOMAS; FREIRE, LIVIA S.; WANG, GUIQUAN; BOLSTER, DIOGO; XIAN, PENG; SOROOSHIAN, ARMIN; REID, JEFFREY S.; RICHTER, DAVID H.. Predicting Vertical Concentration Profiles in the Marine Atmospheric Boundary Layer With a Markov Chain Random Walk Model. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, v. 125, n. 19, . (18/24284-1)
PARK, HYUNGWON JOHN; REID, JEFFREY S. S.; FREIRE, LIVIA S. S.; JACKSON, CHRISTOPHER; RICHTER, DAVID H. H.. In situ particle sampling relationships to surface and turbulent fluxes using large eddy simulations with Lagrangian particles. Atmospheric Measurement Techniques, v. 15, n. 23, p. 24-pg., . (18/24284-1)

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