Surface Heat Fluxes
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Configuration Study of Structurally Integrated Thermal Protection Systems for a Sub-Orbital Platform
ABSTRACT: The atmospheric hypersonic flight of sub-orbital and space vehicles generates aerodynamic heating and high wall heat fluxes, inducing high temperatures on the vehicle's structures and affecting their mechanical behavior, besides degrading the operation of board equipment. Furthermore, since payload preservation is always mandatory, the use of effic
J. Aerosp. Technol. Manag.. Publicado em: 2015-06
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2. TURBULENT EXCHANGE OF SCALARS ABOVE AND WITHIN AN ARAUCARIA FOREST IN SOUTHERN BRAZIL / TROCAS TURBULENTAS DE ESCALARES ACIMA E NO INTERIOR DE UMA FLORESTA DE ARAUCÁRIA NO SUL DO BRASIL
Turbulent exchange of scalars is analyzed for a year of turbulence data, above and within an Araucaria Forest in southern Brazil. Sensible and latent heat fluxes, as well as CO2 fluxes are calculated by the eddy covariance method and analyzed in terms of the seasonal variation of their daily cycles. Diurnal and nocturnal vertical velocity spectra, sensible a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/07/2011
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3. Analysis of energy fluxes and vegetation-atmosphere parameters in irrigated and natural ecosystems of semi-arid Brazil.
Knowledge on evapotranspiration is essential in quantifying water use depletion and to allocate scarce water resources to competing uses. Despite that an extensive literature describes the theoretical mechanisms of turbulent water vapour transport above and within crop canopies fewer studies have examined land surface parameters within composite landscapes o
Journal of Hydrology. Publicado em: 2011
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4. A finite element model for the ocean circulation driven by wind and atmospheric heat flux
A finite element model for solving ocean circulation forced by winds and atmospheric heat fluxes is presented. It is vertically integrated 1 1/2 layer model which solves the motion and continuity hydrodynamic equations coupled with the advection-diffusion transport equation for temperature. A space-time Petrov-Galerkin formulation is used to minimize the und
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-03
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5. Simulação numérica da influência dos fluxos de superfície em ciclones na costa leste do sul do Brasil / Numerical simulation of the role of surface heat and moisture fluxes in cyclones at the southeastern coast of Brasil.
O papel dos fluxos de superfície de calor sensível e latente (FCSL) em dois ciclones extratropicais com desenvolvimento distinto na costa do sul do Brasil foi avaliado a partir de simulações numéricas utilizando o modelo de área limitada WRF versão 2.2. Em um dos ciclones, a circulação se originou em baixos níveis e propagou-se para a média tropos
Publicado em: 2010
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6. Avaliação do impacto das condições hídricas do solo no início da estação chuvosa de 2004/2005 / Evaluation of the hydric soil conditions role on the 2004/2005 rainy season onset
Some studies have been showed that the surface heat fluxes are important to the monsoon system around the world. The importance of the soil moisture on seasonal forecasts has also been pointed out. Therefore, the influence of the soil moisture on the early stages of the South America (SA) monsoon system was the aim of this study. Moreover, it is aimed to kno
Publicado em: 2009
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7. Numerical simulation of the rainfall diurnal cycle over the amazon basin during the rainy season / Simulação numérica do ciclo diário da precipitação sobre a bacia amazônica durante a estação chuvosa
The diurnal cycle is the climatic mode directly modulated by surface forcing. Numerical models fail to simulate it, especially over the continental areas during the warm season. Previous studies show that in the Amazon Basin the maximum rainfall is simulated around four hours before to the one observed with rain gauges. Thus, this work emphasizes the importa
Publicado em: 2009
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8. Biomass thermal storage rates and surface energy balance to Amazonian rainforest areas / Taxas de armazenamento térmico na biomassa e balanço de energia em superfície para áreas de floresta de terra firme na Amazônia
Avaliaram-se as características das densidades de fluxo de energia sobre dois sítios de floresta de terra firme da Amazônia, evidenciando o papel de cada componente no fechamento do balanço de energia local, com particular ênfase nas taxas de armazenamento térmico de energia acima do solo. Para esta análise, coletaram-se dados em duas Reservas Biológ
Publicado em: 2009
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9. ESTUDO DOS FLUXOS TURBULENTOS DE CALOR SENSÍVEL E LATENTE NO FUNDO DO VALE DO RIO DA PRATA
Three observational campaigns have been conducted in the region of Nova Roma do Sul, southern Brazil. In the last one of them, a micrometeorological tower was deployed above the river surface, at the bottom of the Prata river valley. The purpose was to characterize the exchange between the river surface and the atmosphere. The micrometeorological parameters
Publicado em: 2008
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10. Inclusion of the momentum perturbation in the kain-fritsch cumulus parameterization scheme and impacts on a convective rain case / Inclusão da perturbação de momentum no esquema de parametrização de cumulus kain-fritsch e impactos sobre um caso de chuva convectiva
The objective of this work is to insert the vertical transport of momentum through the mass flux in the Kain-Fritsch convective parameterization scheme. The momentum fluxes were inserted in the KF scheme in a similar way to the existing heat fluxes. Experiments were accomplished in the two domains, one experiment with cloud updraft (FM1) and one experiment i
Publicado em: 2007
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11. Effects of compressibility on aerodynamic surface quantities over low-density hypersonic wedge flow
Hypersonic flow past truncated wedges at zero incidence in thermal non-equilibrium is investigated for a range of Mach number from 5 to 12. The simulations were performed by using a Direct Simulation Monte Carlo (DSMC) Method. The study focuses the attention of designers of hypersonic configurations on the fundamental parameter of bluntness, which can have a
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09
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12. AVALIAÇÃO DO MÉTODO DO BALANÇO DA CAMADA LIMITE PARA A ESTIMATIVA DE FLUXOS TURBULENTOS NOTURNOS / EVALUATION OF THE BOUNDARY LAYER BUDGET METHOD FOR NOCTURNAL TURBULENT FLUX ESTIMATES
This work is about to verify the performance of the boundary layer budgeting method as alternative for measuring the surface turbulent fluxes in conditions that allow the validation of the measurements with data taken from a tower equipped with sensors, which were processed through the eddy correlation method. A research is made on the knowledge generated to
Publicado em: 2006