Navier
Mostrando 1-12 de 294 artigos, teses e dissertações.
-
1. Simulation of Current Pulses and Sound Waves Resulting from Partial Discharges in a Needle-Plane Geometry in Air
Abstract Partial discharges can occur in different types of electric equipment and cause progressive insulation deterioration, so there is interest in monitoring partial discharges for assessing the state of the isolation of an electric system and to predict failures. Techniques to detect partial discharges, such as detecting ultrasonic emission, have been p
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
-
2. Numerical and experimental evaluation of the thermally stratified atmospheric boundary layer in wind tunnels
Abstract The atmospheric boundary layer (ABL) flow occurs due to the interaction between the Earth’s surface and atmosphere, and it usually happens under thermal stratification. Therefore, in order to emulate this phenomenon, atmospheric wind tunnels need appropriate devices, such as spires and cubical roughness elements, at the entrance of the wind tunnel
REM, Int. Eng. J.. Publicado em: 2021-01
-
3. Comparação numérico-experimental de ventiladores radiais aplicados em transporte pneumático de adubadores agrícolas
RESUMO Este estudo apresenta um comparativo numérico-experimental de dois tipos de rotores radiais utilizados em um sistema de adubação agrícola a uma rotação de 4000 rpm. Para validação da análise numérica realizaram-se experimentos em uma bancada de testes utilizando um anemômetro de fio quente para as medidas de velocidade e um tubo de Pitot pa
Rev. bras. eng. agríc. ambient.. Publicado em: 2021-01
-
4. De protótipos numéricos a modelos reais: Um estudo progressivo de parâmetros aerodinâmicos de estruturas não convencionais de concreto utilizando a Dinâmica dos Fluidos Computacional
Resumo A avaliação prática dos coeficientes aerodinâmicos em estruturas de concreto não convencionais demanda estudos específicos, que consistem em modelos em escala reduzida, em túnel de vento, para estimativa desses parâmetros. Instalações sofisticadas e sensores especiais são necessários, e a tendência é que as construções modernas, cada v
Rev. IBRACON Estrut. Mater.. Publicado em: 2020-06
-
5. MODELING AND SIMULATION OF A VACUUM MEMBRANE DISTILLATION PLANT COUPLED WITH SOLAR ENERGY AND USING HELICAL HOLLOW FIBERS
Abstract This paper investigates the effect of operating conditions such as coil pitch, fiber diameter, distance between fiber and absorber internal wall and absorber diameter for a vacuum membrane installation coupled with solar energy and using helically coiled fiber to maximize the permeate flow rate. The model is based on a system of equations composed o
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
-
6. Numerical Simulation of a Pitching Airfoil Under Dynamic Stall of Low Reynolds Number Flow
ABSTRACT: In this research, viscous, unsteady and turbulent fluid flow is simulated numerically around a pitching NACA0012 airfoil in the dynamic stall area. The Navier-Stokes equations are discretized based on the finite volume method and are solved by the PIMPLE algorithm in the open source software, namely OpenFOAM. The SST k - ω model is used as the tur
J. Aerosp. Technol. Manag.. Publicado em: 14/11/2019
-
7. Application of an alternative mesh morphing method on the numerical modeling of oscillating wave surge converters
RESUMO Uma das tecnologias capazes de explorar a energia das ondas, baseada na captação das componentes horizontais do movimento destas, aliada a um sistema placa-pistão, vem experimentando um notável desenvolvimento ao longo dos últimos anos, tal dispositivo é conhecido como conversor oscilante por translação de ondas. Este possui um grande potencia
RBRH. Publicado em: 29/07/2019
-
8. Hankel transformation method for solving the Westergaard problem for point, line and distributed loads on elastic half-space
Abstract The Hankel transformation method was used in this work to determine the normal and shear stress distributions due to point, line and distributed loads applied to the surface of an elastic media. The elastic media considered in this study was assumed to be inextensible in the horizontal directions, and the only non-vanishing displacement component is
Lat. Am. j. solids struct.. Publicado em: 04/02/2019
-
9. Improvement of Airfoils Aerodynamic Efficiency by Thermal Camber Phenomenon at Low Reynolds Number
ABSTRACT: In this research, viscous, laminar and steady flow around symmetric and non-symmetric airfoils is simulated at Low Reynolds Number (LRN). Navier-Stokes (N-S) equations are discretized by Finite Volume Method (FVM) and are solved by the SIMPLE algorithm in an open source software, namely OpenFOAM. The main objective of this paper is the introduction
J. Aerosp. Technol. Manag.. Publicado em: 01/11/2018
-
10. 2D analysis of laminated composite and sandwich plates using a new fifth-order plate theory
Abstract In the present paper, a new fifth-order shear and normal deformation theory (FOSNDT) is developed for the bi-directional bending analysis of laminated composite and sandwich plates subjected to transverse loads. This theory considered the effects of both transverse shear and normal deformations. In-plane displacements use a polynomial shape function
Lat. Am. j. solids struct.. Publicado em: 17/09/2018
-
11. 1D analysis of laminated composite and sandwich plates using a new fifth-order plate theory
Abstract In the present study, a new fifth-order shear and normal deformation theory (FOSNDT) is developed for the analysis of laminated composite and sandwich plates under cylindrical bending. The theory considered the effects of transverse shear and normal deformations. To account for the effect of transverse shear deformation, in-plane displacement uses
Lat. Am. j. solids struct.. Publicado em: 23/04/2018
-
12. Wall function treatment for bubbly boundary layers at low void fractions
Abstract The present work investigates the role of different treatments of the lower boundary condition on the numerical prediction of bubbly flows. Two different wall function formulations are tested against experimental data obtained for bubbly boundary layers: (i) a new analytical solution derived through asymptotic techniques and (ii) the previous formul
An. Acad. Bras. Ciênc.. Publicado em: 2018-03