Wake Model
Mostrando 1-12 de 38 artigos, teses e dissertações.
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1. 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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2. The Theoretical Research for the Rotor/Fuselage Unsteady Aerodynamic Interaction Problem
ABSTRACT Based on coupled unsteady panel/free-wake method, a universal analysis model was established, which provides a good prediction for the rotor/fuselage unsteady aerodynamic interaction. Considering the deficiencies of the traditional time-marching rotor free-wake algorithms, notably on stability and efficiency, the CB3D algorithm with 3rd-order accura
J. Aerosp. Technol. Manag.. Publicado em: 2016-09
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3. A New Coupled Free Wake-CFD Method for Calculation of Helicopter Rotor Flow-Field in Hover
ABSTRACT: This paper concerns a new coupled free wake-CFD method for proper calculation of aerodynamic loads on a two bladed helicopter rotor in hovering flight. Loading is computed by solving the three dimensional Euler equations in a rotating coordinate system. However, since direct simulation of the tip vortices and wake requires a very fine grid, the rot
J. Aerosp. Technol. Manag.. Publicado em: 2014-06
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4. Sleep pattern and learning in knockdown mice with reduced cholinergic neurotransmission
Impaired cholinergic neurotransmission can affect memory formation and influence sleep-wake cycles (SWC). In the present study, we describe the SWC in mice with a deficient vesicular acetylcholine transporter (VAChT) system, previously characterized as presenting reduced acetylcholine release and cognitive and behavioral dysfunctions. Continuous, chronic ECo
Braz J Med Biol Res. Publicado em: 2013-10
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5. Unsteady Blade Element-Momentum Method Including Returning Wake Effects
ABSTRACT: The wind energy research has grown substantially in the past few years, considerably fostered by the pursuit for a clean and sustainable energy source. Improvements on the design methods are increasingly needed. The purpose of this research is to investigate the use of the Loewy's lift deficiency function (LDF), also named Returning Wake Model, cou
J. Aerosp. Technol. Manag.. Publicado em: 2013-03
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6. Otimização e dinâmica dos fluidos computacional aplicadas a turbinas eólicas
The present work consists in the application of optimization methods and computational fluid dynamics to wind turbines. The massive growth in renewable energies demands more powerful turbines and more accuracy in their design and analysis. This work has three objectives: optimization of an airfoil for wind turbines, simulation of a wind turbine airfoil in de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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7. Investigação experimental e analítica do escoamento ao redor de cilindro circular com supressores de VIV. / Experimental and analytical investigation of the flow around circular cylinder with VIV suppressors.
The fluid flow around bluff bodies is one of the main problems in fluid mechanics. The investigations of this phenomenon are based on analytical, numerical and experimental techniques. Each technique presents advantages and disadvantages, being impossible the comprehensive characterization of the flow though only one technique for the majority of body geomet
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/09/2011
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8. Parametric analysis of a phenomenological model for vortex-induced motions of monocolumn platforms
Phenomenological models are an important branch in VIV (Vortex-Induced Vibrations) and in VIM (Vortex-Induced Motions) studies to complement the results achieved via CFD (Computational Fluid Dynamics), as the latter tool is not presently a suitable tool for intense use in engineering analysis, due to high computer power requirements. A phenomenological model
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-06
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9. Simulation of two-dimensional high reynolds number wake flows with the use of filtered lagrangian navier-stokes equations
This work presents a method for numerical simulation of viscous fluid flows based on the use of filtered Lagrangian Navier-Stokes equations. It is based on the hypothesis that the small scale motions are responsible for the homogenization of the physical properties in infinitesimal fluid parcels through a mixing process, mathematically expressed as a spatial
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-03
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10. Estudo da influência da esteira e da densidade de máquinas na produção de energia em uma fazenda eólica / Study of the influence of wake and density of wind turbines in the production of energy in a wind farm
O presente trabalho faz uma avaliação de como a disposição das turbinas e o desenvolvimento da esteira produzida por cada uma delas influenciam na geração de energia dentro de um parque eólico. Utilizando o modelo analítico de esteira PARK, verifica-se a influência de cada esteira na direção de maior frequência de vento para diferentes configura�
Publicado em: 2011
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11. Análise dos eventos tônicos e fásicos do sono dessincronizado em ratos Wistar com lesão medular contusa / Análise dos eventos tônicos e fásicos do sono dessincronizado em ratos Wistar com lesão medular contusa
After a spinal cord injury (SCI), structural reorganization occurs locally and at multiple levels of the central nervous system (CNS). Compromising of sensory motor functions and significant alterations of other neural functions are normally related after a SCI. The circardians rhythms, specially the sleep-wake cycle are frequently affected after a trauma or
Publicado em: 2009
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12. Controle jurídico de políticas públicas de incentivo para empresas socialmente responsáveis
Seeks to establish a definition and delimitation of the topic involving the corporate social responsibility in order to make a distinction between this idea and constitutional knwoledge that we have about the social role of companies in an attempt to resolve the confusion among the subjects. The need to clarify the differences lies in the problematic of the
Publicado em: 2009