Wind Shear
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Assessment of the effects of vegetational cover on the long-term stabilityof a waste rock dump
Abstract Waste rock dump reclamation includes re-grading the banks to flatten the overall slope followed by re-vegetation. These measures are required to reduce surface erosion, provide physical stability, and meet future use goals. In some cases, the presence of trees can cause localized shear zones in a waste rock dump by the load of the tree mass and the
REM, Int. Eng. J.. Publicado em: 16/09/2019
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2. Experimental study of the neighborhood effects on the mean wind loading over two equivalent high-rise buildings
Abstract This paper presents a series of results with respect to the mean values of shear, base moment and torsion acting in a building obtained through an experimental wind tunnel study using the standard building proposed by the Commonwealth Advisory Aeronautical Research Council (CAARC) as building reference. In the loading determination, the interferenc
Lat. Am. j. solids struct.. Publicado em: 03/05/2018
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3. Numerical Study of Wake Characteristics in a Horizontal-Axis Hydrokinetic Turbine
ABSTRACT Over the years most studies on wake characteristics have been devoted to wind turbines, while few works are related to hydrokinetic turbines. Among studies applied to rivers, depth and width are important parameters for a suitable design. In this work, a numerical study of the wake in a horizontal-axis hydrokinetic turbine is performed, where the ma
An. Acad. Bras. Ciênc.. Publicado em: 01/12/2016
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4. Circulation on the Inner and Mild Continental Shelf of the State of São Paulo during summer: numeric studies / Circulação na Plataforma Continental Interna e Média do Estado de São Paulo durante o verão: estudos numéricos
The aim of this study was simulate the hydrodynamic of the Inner Continental Shelf of the State of São Paulo (PCISP) and of the Mid Continental Shelf of the State of São Paulo (PCMSP) during summer, in response to the density gradient forcing, to the climatological wind shear stress forcing and to the tide forcing, applying the tridimensional hydrodynamic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/02/2012
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5. Theoretical-experimental study on two-dimentional confined jets. / Estudo teórico-experimental de jatos bi-dimensionais confinados.
The main objective of this thesis is to study the mean flow inertial and pressure effects on the mean flow itself in two-dimensional confined jets. The flows considered in the present work are turbulent, isothermal, incompressible and single-fluid. The introduction and the bibliographical review are done by the following presentations: technological and fund
Publicado em: 2009
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6. CARACTERÍSTICAS ESTATÍSTICAS TURBULENTAS ASSOCIADAS AO FENÔMENO DO VENTO NORTE NO SUL DO BRASIL: APLICAÇÃO AO PROBLEMA DA DIFUSÃO DE CONTAMINANTES / TURBULENT STATISTICAL CHARACTERITICS ASSOCIATED TO THE NORTH WIND PHENOMENON IN SOUTHERN BRAZIL: APPLICATION IN THE PROBLEM OF CONTAMINANTS DIFFUSION
Foi realizada uma parametrização para os processos de transporte em uma camada limite planetária (CLP) dominada pela turbulência mecânica, empregando quantidades estatísticas turbulentas medidas durante eventos do Vento Norte no Sul do Brasil. Assim, espectros observados de energia turbulenta unidimensionais são comparados com um modelo espectral base
Publicado em: 2008
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7. Estudo de frentes mesosféricas na região equatorial / Study of mesospheric fronts in the equatorial region
An extensive study on mesospheric fronts was carried out by means of mesospheric airglow image observation at at São João do Cariri, PB (7,4oS; 36,5oW) from July 2004 to December 2005. All sky airglow images, meteor radar wind and TIMED/SABER satellite temperature data were used in order to investigate physical scenario of the mesospheric front. Three diff
Publicado em: 2007
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8. Controle de vibrações em edifícios submetidos à ação de cargas dinâmicas utilizando amortecedor de massa sintonizando na forma de pêndulo / Vibration control of structures subjected to dynamic loads using tuned pendulum-shaped mass dampers
The ongoing progress of structural analyses and dimensioning, in addition to the continuous advancements in building techniques and material, has made it possible to build taller and more slender structures every day. These structures are also more vulnerable to excessive vibrations caused by dynamic loads like earthquakes, winds, waves, intense traffic, and
Publicado em: 2007
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9. AnÃlise da influÃncia do cisalhamento eÃlico sobre a circulaÃÃo na regiÃo costeira de GuamarÃ-RN, Brasil
O sistema de modelos SisBaHiA foi utilizado para analisar a influÃncia do cisalhamento eÃlico sobre a circulaÃÃo da regiÃo costeira de GuamarÃ, estado do Rio Grande do Norte, Brasil. Para isso, foram obtidas as correntes residuais sazonais desta Ãrea, onde as componentes vetoriais mÃdias da situaÃÃo forÃada exclusivamente pelas marÃs foram subtra
Publicado em: 2007
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10. DECAIMENTO DA TURBULÊNCIA NA CAMADA SUPERFICIAL
This dissertation presents a study of the atmospheric turbulence decay on the surface layer during the evening transition. This is done through the analysis of the spectral densities temporal evolutions of the three wind components, observed at a micrometeorological site in the central region of Rio Grande do Sul state, Brazil. From the observed spectra, the
Publicado em: 2005
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11. Modelagem de pilares paredes em edifÃcios
Slender sky-scraper constructions require pondering prior analysis features like global and localized geometrical imperfection, physical and geometrical non-linearity aspects, adequate modeling of structural elements with respect to shear-wall elements, etc. In this work, the shear-wall behavior of an actual building is studied, upon which columns were model
Publicado em: 2002
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12. x / Transporte turbulento na camada superficial da atmosfera em condicoes diabaticas
An expression for the diabatic wind profile is derived by various workers using dimensional analysis and the assumption that the turbulent diffusivity coefficient for momentum can be partitioned into two parts, one associated with forced convection and the other with natural convection. The turbulent diffusivity coefficient is also assumed to be given as a l
Publicado em: 1980