Physical and Mechanical Characterization of Copaifera sp. Wood Specie

Abstract

The aim of this work is evaluating the behaviour of the pollutant plume in the region where the INEL (USA) experiment was released. The INEL diffusion experiment consists of a test series that was accomplished in a flat and uniform terrain under stable low wind atmospheric conditions. Thusly, accounting for the current understanding of the stable planetary boundary layer (PBL) turbulence pattern and characteristics (stable eddy diffusivities), a modelling system consisting of the WRF (Weather Research and Forecasting) and LES-PALM (Large-Eddy Simulation-Parallelized) model is employed to describe the dispersive effects associated with the wind meandering movements. The potential temperature profiles and heat fluxes generated by the WRF model will be used as initial conditions to the LES-PALM model. PALM is referred as a model to Large Eddy Simulation (LES) to atmospheric and oceanic fluxes that is destined to parallel computer architectures. The horizontal wind meandering generated by LES-PALM model will be used as initial conditions to the dispersion model based in the 3D-GILTT (3D Generalized Integral Laplace Transform Technique) technique that analytically solves the advection-diffusion equation. This technique of the integral transform combines a series expansion with an integration. In the expansion a trigonometric base, determined from the Sturm-Liouville auxiliary problem, is employed. The integration is made in all range of the transformed variable, making use of the orthogonality property of the base used in the expansion. The resultant ordinary differential equations system is analytically solved using the Laplace transform and diagonalization. The simulation results, generated from this modelling system are show to agree with the observed ground-level centreline concentrations of INEL experiments and also with those of other atmospheric dispersion models. The present study shows that the horizontal wind field provided by the coupling of two meteorological models (WRF and LES-PALM) can be used in a Eulerian diffusion model to properly simulate meandering enhanced dispersion of contaminants in a low wind speed stable PBL.