Upwind Schemes
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. A TVD scheme for 3d unstructured grids applied to compositional reservoir simulation
Abstract In reducing the grid orientation effect for the numerical solution of partial differential equations, interpolation functions play an important role when the advective transport of the governing equations is considered. This is due to the fact that, in general, the unknowns are evaluated in the vertices of the elements and such properties must be ex
Braz. J. Chem. Eng.. Publicado em: 2017-10
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2. Comparison of an impec and a semi-implicit formulation for compositional reservoir simulation
In compositional reservoir simulation, a set of non-linear partial differential equations must be solved. In this work, two numerical formulations are compared. The first formulation is based on an implicit pressure and explicit composition (IMPEC) procedure, and the second formulation uses an implicit pressure and implicit saturation (IMPSAT). The main goal
Braz. J. Chem. Eng.. Publicado em: 2014-12
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3. Study of Conservation on Implicit Techniques for Unstructured Finite Volume Navier-Stokes Solvers
ABSTRACT: The work is a study of conservation on linearization techniques of time-marching schemes for the unstructured finite volume Reynolds-averaged Navier-Stokes formulation. The solver used in this work calculates the numerical flux applying an upwind discretization based on the flux vector splitting scheme. This numerical treatment results in a very la
J. Aerosp. Technol. Manag.. Publicado em: 2014-09
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4. Simulação numérica de equações de conservação usando esquemas \"upwind / Numerical simulation of conservations equations using upwind schemes
Uma família de esquemas upwind denominada FUS-RF (Family of Upwind Scheme via Rational Functions), que é derivada via funções racionais e dependentes de parâmetros, é proposta para o cálculo de soluções aproximadas de equações de conservação. A fim de ilustrar a capacidade dos novos esquemas, vários resultados computacionais para sistemas hiper
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/04/2012
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5. A study of convective flux schemes for aerospace flows
This paper presents the effects of some convective flux computation schemes on boundary layer and shocked flow solutions. Second-order accurate centered and upwind convective flux computation schemes are discussed. The centered Jameson scheme, plus explicitly added artificial dissipation terms are considered. Three artificial dissipation models, namely a sca
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-09
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6. Um esquema upwind polinomial por partes para problemas em mecânica dos fluidos / A piecewise polynomial upwind scheme for problems in fluid mechanics
Este trabalho de pesquisa é dedicado ao desenvolvimento, análise e implementação de um novo esquema upwind de alta resolução (denominada PFDPUS) para a aproximação de termos convectivos em leis de conservação e problemas relacionados em mecânica dos fluídos. Usando variáveis normalizadas de Leonard, o equema PFDPUS é baseado em uma função pol
Publicado em: 2011
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7. Order of accuracy study of unstructured grid finite volume upwind schemes
A detailed numerical study is presented of the order of accuracy of some proposed cell centered, finite volume schemes used for the solution of the 2-D gasdynamic equations on triangular unstructured grids. The schemes studied are based on a MUSCL-type linear reconstruction of interface properties, which seeks to achieve 2nd-order accuracy in space. They are
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-03
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8. Development and testing of high-resolution upwind schemes and their applications in incompressible free surface flows / Desenvolvimento e teste de esquemas "upwind" de alta resolução e suas aplicações em escoamentos incompressíveis com superfícies livres
Neste trabalho são apresentados os resultados do desenvolvimento e teste de esquemas upwind de alta resolução para o controle da difusão numérica em leis de conservação gerais e problemas em dinâmica dos fluidos. Em particular, são derivados dois novos esquemas: o ALUS (Adaptive Linear Upwind Scheme) e o TOPUS (Third-Order Polynomial Upwind Scheme).
Publicado em: 2009
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9. AnÃlise de escoamentos compressÃveis nÃo-viscosos em trÃs dimensÃes utilizando o mÃtodo dos elementos finitos por aresta
This work has as its main goal the development of a computational tool for numerical simulation of compressible fluid flow problems for three dimensions, using as starting point the computational tool developed by LYRA (1994) that dealt with fluid flow problems in two dimensional domain. For the development of this tool, a space discretization was adopted us
Publicado em: 2008
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10. Comparison among structured first order algorithms in the solution of the euler equations in two-dimensions
The present work studies upwind schemes applied to the solution of aeronautical and aerospace problems. The Harten, the Frink, Parikh and Pirzadeh, the Liou and Steffen and the Radespiel and Kroll algorithms, all first order accurate in space, are studied. The Euler equations in conservative form, employing a finite volume formulation and a structured spatia
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-12
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11. On the behavior of upwind schemes applied to three-dimensional supersonic and hypersonic cold gas flow simulations of aerospace configurations.
The present work describes the efforts towards the implementation of upwind schemes to simulate supersonic and hypersonic cold gÃs flows. The class of flux vector splitting schemes has been chosen, and the particular methods implemented are the van Leer and Liou schemes. Results for different freestream Mach numbers and mesh topologies are discussed in orde
Publicado em: 2007
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12. Comparison between a centered and a flux difference split schemes using unstructured strategy
Products developed at industries, institutes and research centers are expected to have high level of quality and performance, having a minimum waste, which require efficient and robust tools to numerically simulate stringent project conditions with great reliability. In this context, Computational Fluid Dynamics (CFD) plays an important role and the present
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-09