Galerkin Approximation
Mostrando 13-18 de 18 artigos, teses e dissertações.
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13. O metodo de Galerkin descontinuo com difusividade implicita e h-adaptabilidade baseada em tecnicas Wavelet
In this work an inovative technique is presented for the numerical approximation of conservation laws on unstructured meshes. The numerical scheme uses a discontinuous piecewise polynomial approximation with hadaptivity. The self-adaptive h-refinement strategy uses a regularity assessment of the solution based on wavelet techniques. This strategy determines
Publicado em: 2002
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14. Solidificação de ligas binarias : existencia de soluções de modelos do tipo campo de fase
In this work we present results of existence of solutions for some mathematical models of phase- field type for solidification of binary alloys. Firstly, we consider a model based on a highly non-linear degenerate parabolic system of partial differential equations, with three independent variables: phase-field, solute concentration and temperature. After tha
Publicado em: 2002
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15. Métodos sem malha e método dos elementos finitos generalizados em análise não-linear de estruturas / Meshless Methods and Generalized Finite Element Method in Structural Nonlinear Analysis
The Generalized Finite Element Method, GFEM, shares several features with the so called meshless methods. The approximation functions used in the GFEM are associated with nodal points like in meshless methods. In addition, the enrichment of the approximation spaces can be done in the same fashion as in the meshless hp-Cloud method. On the other hand, the par
Publicado em: 2002
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16. NUMERICAL MODEL FOR A SIMULATION OF VISCOELASTIC FLUIDS VIA FINITE ELEMENTS / UM MODELO NUMÉRICO PARA A SIMULAÇÃO DO ESCOAMENTO DE FLUIDOS VISCOELÁSTICOS VIA ELEMENTOS FINITOS
A new numerical scheme has been introduced for viscoelastic fluid flows. First, it was studied the viscoelastic behavior with particular emphasis on equations in wich the extra stress tensor is not explicity dependent of the velocity field. Two of the most difficult to solve constitutive models have been considered, the Maxwell-B and Oldroyd-B. The numerical
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/02/1993
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17. Approximate solutions of problems involving charge transport in dielectrics using Galerkins method / Soluções aproximadas pelo Método de Galerkin de problemas envolvendo o transporte de cargas em isolantes.
Approximate solutions for some problems of charge transport in dielectrics, unsolved yet by exact methods, are presented using Galerkins Method. This allows to transforming the system of partial differential equations, describing transport with trapping, into a system of ordinary differential equations which are, then, integrated numerically. Whenever possib
Publicado em: 1982
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18. Remarkable statistical behavior for truncated Burgers–Hopf dynamics
A simplified one-dimensional model system is introduced and studied here that exhibits intrinsic chaos with many degrees of freedom as well as increased predictability and slower decay of correlations for the large-scale features of the system. These are important features in common with vastly more complex problems involving climate modeling or molecul
The National Academy of Sciences.