Primitive Variables
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Comparing an Ensemble Kalman Filter to a 4DVAR Data Assimilation System in Chaotic Dynamics
ABSTRACT: In this paper, the Ensemble Kalman Filter is compared with a 4DVAR Data Assimilation System in chaotic dynamics. The Lorenz model is chosen for its simplicity in structure and the dynamic similarities with primitive equations models, such as modern numerical weather forecasting. It was examined if the Ensemble Kalman Filter and 4DVAR are effective
J. Aerosp. Technol. Manag.. Publicado em: 2017-12
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2. Planejamento de aula e o uso de Tecnologias da Informação e Comunicação: percepção de docentes do Ensino Médio / Class planning and the use of Information and Communication Technology: perceptions of teachers at the secondary level
This study has as its objective to gauge the adequacy and efficiency of class planning done by teachers for the effective use of Information and Communication Technology (ICT) in the classroom, and to present indicators of class planning characteristics that encourage the use of information and communication technology in integration with learning situations
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2012
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3. Análise da convecção forçada no escoamento bidimensional laminar em dutos retangulares via GITT com variáveis primitivas. / Analysis of forced convection in two-dimensional laminar flow in rectangular ducts with via gitt primitive variables.
In the present study, forced convection flow in two-dimensional laminar simultaneous development pipeline with rectangular geometry, is analyzed analytically using the Navier-Stokes, Poisson and Energy in its primitive form. These equations are solved by the Generalized Integral Transform Technique, which is characteristic hybrid-numeric. The development wor
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2012
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4. Análise da convecção forçada no escoamento bidimensional laminar em dutos circulares em variáveis primitivas via GITT. / Analysis of the forced convection in the bidimensional laminar flow in circular ducts in primitive variable by GITT.
No presente trabalho a convecção forçada interna no escoamento laminar em desenvolvimento simultâneo é estudada aplicando a Técnica da Transformada Integral Generalizada para produzir um solução híbrida para os campos de velocidade, pressão e temperatura em dutos circulres. As equações da Continuidade, de Navier-Stokes, de Possion e da Energia s�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2012
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5. Simulação computacional de escoamentos reativos com baixo número Mach aplicando técnicas de refinamento adaptativo de malhas / Computational simulation of low Mach number reacting flows applying adaptive mesh refinement techniques.
It is the main goal of the present work to extend a numerical methodology based on both the use of an adaptive mesh refinement technique (AMR) and the use of a multistep, implicit-explicit time-step strategy (IMEX) to applications involving low Mach number reactive flows. Originally developed for incompressible flows, the Eulerian formulation of that methodo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/06/2012
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6. Análise das equações de Navier-Stokes no escoamento bidimensional em dutos com formulação em variáveis primitivas via GITT / ANALYSIS OF THE NAVIER-STOKES EQUATIONS IN TWO DIMENSIONAL FLOW WITH PRIMITIVE VARIABLES FORMULATION VIA GITT
No presente trabalho a Técnica da Transformada Integral Generalizada é empregada para produzir soluções híbridas para os campos de velocidade e pressão de um fluido newtoniano no escoamento bidimensional. O problema é formulado a partir da utilização das variáveis primitivas e as manipulações matemáticas necessárias foram usadas para a obtenç�
Publicado em: 2010
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7. Modelagem computacional de estruturas anatômicas em 3D e simulação de suas imagens radiográficas / Computational 3D modelling of anatomic structures and simulation of its radiography images
The conventional methods of quality control applied to radio diagnosis are the best way to have assured good quality of the produced images. Due the amount of variables to consider, the study of particular issues of the process of formation of radiological images requires complementary computational tools. However, the computational voxel based phantoms are
Publicado em: 2008
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8. Laminar elliptic flow in the entrance region of tubes
The developing region of an axially symmetric laminar flow from a reservoir to a sharp-edged tube is numerically simulated with a primitive-variables solver of the Navier-Stokes equations, using a plenum upstream of the tube inlet in order to avoid arbitrary specification of the profile at the inlet. Development region lengths, velocity profiles and head los
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-09
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9. A chebyshev collocation spectral method for numerical simulation of incompressible flow problems
This paper concerns the numerical simulation of internal recirculating flows encompassing a two-dimensional viscous incompressible flow generated inside a regularized square driven cavity and over a backward-facing step. For this purpose, the simulation is performed by using the projection method combined with a Chebyshev collocation spectral method. The inc
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-09
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10. Generalized Integral Transform Solution for hydrodynamically developing non-Newtonian flows in circular tubes
The Generalized Integral Transform Technique (GITT) is applied to the solution of the momentum equations in a hydrodynamically developing laminar flow of a non-Newtonian power-law fluid inside a circular duct. A primitive variables formulation is adopted in order to avoid the singularity of the auxiliary eigenvalue problem in terms of Bessel functions at the
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-03
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11. The boundary element method applied to incompressible viscous fluid flow
An Integral equation formulation for steady flow of a viscous fluid is presented based on the boundary element method. The continuity, Navier-Stokes and energy equations are used for calculation of the flow field. The governing differential equations, in terms of primitive variables, are derived using velocity-pressure-temperature. The calculation of fundame
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-12
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12. Numerical Simulation of Flow with Heat Transfer in Periodic Rib Roughened Tubes / Simulação numérica de escoamentos com troca de calor no interior de tubos com nervuras periódicas
With the aim of develop a computational tool for thermodynamic optimization of heat exchangers, a computational code was implemented to solve the Navier-Stokes equations in an axisymmetric domain using the finite volume method and central differencing with Runge-Kutta explicit temporal advance and pressure-velocity coupling of fractional step type. This work
Publicado em: 2002