Neyva Maria Lopes Romeiro
Universidade Estadual de Londrina
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Semina-ciencias Agrarias | 2012
V.G. Ferreira; Giseli De Lima; Laís Corrêa; Miguel A. Caro Candezano; Eliandro Rodrigues Cirilo; Paulo Laerte Natti; Neyva Maria Lopes Romeiro
This article provides a computational evaluation of the popular high resolution upwind WACEB, CUBISTA and ADBQUICKEST schemes for solving non-linear fluid dynamics problems. By using the finite difference methodology, the schemes are analyzed and implemented in the context of normalized variables of Leonard. In order to access the performance of the schemes, Riemann problems for 1D Burgers, Euler and shallow water equations are considered. From the numerical results, the schemes are ranked according to their performance in solving these non-linear equations. The best scheme is then applied in the numerical simulation of tridimensional incompressible moving free surface flows.
international conference of the chilean computer science society | 2016
Gustavo Taiji Naozuka; Alan Salvany Felinto; Neyva Maria Lopes Romeiro; Eliandro Rodrigues Cirilo; Paulo Laerte Natti
The simulation of differential equations has been widely used to solve problems in different areas. However, it is often necessary to know the geometry under study, and its description in computational meshes suitable to the problem is a difficult task. Furthermore, the problem may be associated with large geometries, making its representation difficult. For this reason, the paper aims to develop a mobile application for Android, in which the user can acquire a set of points delimiting the contour of a study area, based on GPS locations, and also build a computational mesh of the region, in the curvilinear coordinate system. To verify the functioning of the application and evaluate its results, an experiment was conducted using the developed application. The experiment involved a comparison between contours of a lake, acquired in two different ways: Google Earth images and the application. For this experiment, satisfactory results are obtained.
Proceeding Series of the Brazilian Society of Computational and Applied Mathematics | 2014
Caroline Dall’ Agnol; Paulo Laerte Natti; Eliandro Rodrigues Cirilo; Neyva Maria Lopes Romeiro
Toda a propagacao de onda apresenta algum tipo de perda e, por menor que seja esta perda, gerara o decaimento desta onda. Dessa forma, o principal objetivo deste trabalho e estudar a perda de potencia de ondas do tipo soliton durante a propagacao atraves de fibras oticas dissipativas e avaliar o impacto desta dissipacao na transmissao do sinal soliton. Neste contexto, foi desenvolvido um procedimento numerico para resolver um sistema de equacoes diferenciais parciais que descrevem esta propagacao. Este procedimento foi fundamentado no metodo das diferencas finitas e no metodo de Gauss-Seidel com relaxacao e atraves dele e possivel observar e analisar o decaimento da onda soliton, enquanto esta se propaga.
Proceeding Series of the Brazilian Society of Computational and Applied Mathematics | 2014
Tadasi Matsubara; Neyva Maria Lopes Romeiro; Gustavo Taiji Naozuka; Matheus P. Vellone; Saulo M. Mastelini
Os metodos numericos oferecem uma ferramenta indispensavel na determinacao de solucoes aproximadas, uma vez que muitas das solucoes analiticas encontradas na literatura envolvem simplificacoes e descartam as nao linearidades presentes na equacao. A ideia basica desses metodos e o processo de discretizacao, que reduz o problema continuo, com um numero infinito de variaveis, em um problema discreto com um numero finito de variaveis, podendo ser resolvido computacionalmente. No caso do metodo de diferencas finitas (MDF), sua base e puramente matematica, pois pode ser desenvolvido a partir das aproximacoes por series de Taylor, que sao mais economicas computacionalmente. Nesse trabalho o MDF e usado como uma abordagem alternativa para gerar solucoes de equacoes diferenciais parciais (EDP’s), em particular sera utilizado para aproximar os termos temporal, convectivo e difusivo da equacao de Burgers. A nao linearidade do sistema de equacoes gerado a partir da aplicacao do MDF nos termos da equacao de Burgers sera contornada utilizando uma tecnica numerica [1].
Semina-ciencias Agrarias | 2006
Diogo Albino de Queiroz; Paulo Laerte Natti; Neyva Maria Lopes Romeiro; Érica Regina Takano Natti
We develop and evaluate a numerical procedure for a system of nonlinear differential equations, which describe the propagation of solitons into ideal dielectric optical fibers. This problem has analytical solutions known. The numerical solutions of the system is implemented by the finite element method, using methods of stabilization such as Streamline Upwind Petrov-Galerkin (SUPG) and Consistent Approximate Upwind (CAU). Comparing the numerical and analytical solutions, it was found that the numerical procedure adequately describes the dynamics of this system.
Ecological Modelling | 2011
Neyva Maria Lopes Romeiro; Rigoberto G. S. Castro; Eliandro Rodrigues Cirilo; Paulo Laerte Natti
Acta Scientiarum-technology | 2012
Suellen Ribeiro Pardo; Paulo Laerte Natti; Neyva Maria Lopes Romeiro; Eliandro Rodrigues Cirilo
arXiv: Atmospheric and Oceanic Physics | 2010
Suellen Ribeiro Pardo; Paulo Laerte Natti; Neyva Maria Lopes Romeiro; Eliandro Rodrigues Cirilo
Semina-ciencias Agrarias | 2010
Eliandro Rodrigues Cirilo; Paulo Laerte Natti; Neyva Maria Lopes Romeiro; Érica Regina Takano Natti; Camila Fogaça de Oliveira
Transport in Porous Media | 2007
Neyva Maria Lopes Romeiro; Rigoberto G. S. Castro; Sandra M. C. Malta; Luiz Landau