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Listar por autor "Román Moltó, José Enrique"

Mostrando ítems 1-20 de 87

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A Jacobi-Davidson type method with a correction equation tailored for integral operators

Vasconcelos, Paulo B.; d'Almeida, Filomena D.; Román Moltó, José Enrique (Springer Verlag (Germany), 2013-09)

We propose two iterative numerical methods for eigenvalue computations of large dimensional problems arising from finite approximations of integral operators, and describe their parallel implementation. A matrix representation ...
A Krylov-Schur solution of the eigenvalue problem for the neutron diffusion equation discretized with the Raviart-Thomas method

Bernal-Garcia, Alvaro; Hébert, Alain; Roman, Jose E.; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús (Taylor & Francis, 2017)

[EN] Mixed-dual formulations of the finite element method were successfully applied to the neutron diffusion equation, such as the Raviart¿Thomas method in Cartesian geometry and the Raviart¿Thomas¿Schneider in hexagonal ...
A parallel implementation of Davidson methods for large-scale eigenvalue problems in SLEPc

Romero Alcalde, Eloy; Román Moltó, José Enrique (Association for Computing Machinery (ACM), 2014-02)

In the context of large-scale eigenvalue problems, methods of Davidson type such as Jacobi-Davidson can be competitive with respect to other types of algorithms, especially in some particularly difficult situations such ...
A parallel structured banded DC algorithm for symmetric eigenvalue problems

Li, Shengguo; Liao, Xia; Lu, Yutong; Roman, Jose E.; Yue, Xiaoqiang (Springer, 2023)

[EN] In this paper, a novel parallel structured divide-and-conquer (DC) algorithm is proposed for symmetric banded eigenvalue problems, denoted by PBSDC, which modifes the classical parallel banded DC (PBDC) algorithm by ...
A Parallel Structured Divide-and-Conquer Algorithm for Symmetric Tridiagonal Eigenvalue Problems

Liao, Xia; Li, Shengguo; Lu, Yutong; Román Moltó, José Enrique (Institute of Electrical and Electronics Engineers, 2021-02-01)

[EN] In this article, a parallel structured divide-and-conquer (PSDC) eigensolver is proposed for symmetric tridiagonal matrices based on ScaLAPACK and a parallel structured matrix multiplication algorithm, called PSMMA. ...
A polynomial Jacobi-Davidson solver with support for non-monomial bases and deflation

Campos, Carmen; Jose E. Roman (Springer-Verlag, 2020-06)

[EN] Large-scale polynomial eigenvalue problems can be solved by Krylov methods operating on an equivalent linear eigenproblem (linearization) of size d center dot n where d is the polynomial degree and n is the problem ...
Acoustic modal analysis with heat release fluctuations using nonlinear eigensolvers

Hiremath, Varun; Roman, Jose E. (Elsevier, 2023-12-01)

[EN] Closed combustion devices like gas turbines and rockets are prone to thermoacoustic instabilities. Design engineers in the industry need tools to accurately identify and remove instabilities early in the design cycle. ...
Algoritmos de Altas Prestaciones para el Cálculo de la Descomposición en Valores Singulares y su Aplicación a la Reducción de Modelos de Sistemas Lineales de Control

Da Silva Sanches de Campos, Carlos Alberto (Universitat Politècnica de València, 2015-03-31)

P ARA calcular la descomposición en valores singulares (DVS) de una matriz real densa, los métodos tradicionales empiezan por reducir la matriz a una forma bidiagonal y seguidamente calculan la DVS de esa matriz ...
Algoritmos paralelos para la reducción de sistemas lineales de control estables

Guerrero López, David (Universitat Politècnica de València, 2016-01-07)

[EN] In the field of control theory, sometimes system models of big size (with many state variables) appear. When one of these high order systems needs to be simulated, studied or controlled, it is convenient to perform a ...
An extension of the Cayley transform method for a parameterized generalized inverse eigenvalue problem

Dalvand, Zeynab; Hajarian, Masoud; Román Moltó, José Enrique (John Wiley & Sons, 2020-12)

[EN] Since recent studies have shown that the Cayley transform method can be an effective iterative method for solving the inverse eigenvalue problem, in this work, we consider using an extension of it for solving a type ...
Análisis a nivel de varilla de combustible de un accidente de inserción de reactividad con el código acoplado paralelo pCTF/PARCSv2.7

Ramos Peinado, Enrique; Abarca Giménez, Agustín; Román Moltó, José Enrique; Miró Herrero, Rafael (Sociedad Nuclear Española, 2015-09-23)

La descripción detallada del núcleo del reactor tiene cada vez más importancia para los análisis de seguridad de los Reactores de Agua Ligera (LWR). Gracias a los avances en la tecnología informática, los diferentes ...
Aproximación paralela del código termohidráulico de subcanal COBRA-TF

Ramos Peinado, Enrique; Abarca Giménez, Agustín; Román Moltó, José Enrique; Miró Herrero, Rafael (Grupo Senda, 2013)

La paralelización permite el uso de numerosos procesadores (o núcleos) que colaboren en la obtención de la solución a un único problema. Esto no sólo reduce el tiempo de computación, sino que además aumenta la cantidad de ...
Asignación Estática - Descomposición del Dominio

Román Moltó, José Enrique (Universitat Politècnica de València, 2016-06-21)

Se describe la asignación estática de tareas mediante la descomposición del dominio. Concretamente, se describe el caso de la distribución de vectores y matrices, tanto en 1D como en 2D, utilizando una distribución por ...
Assembly Discontinuity Factors for the Neutron Diffusion Equation discretized with the Finite Volume Method. Application to BWR

Bernal-Garcia, Alvaro; Román Moltó, José Enrique; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús (Elsevier Masson, 2016-11)

The neutron flux spatial distribution in Boiling Water Reactors (BWRs) can be calculated by means of the Neutron Diffusion Equation (NDE), which is a space- and time-dependent differential equation. In steady state conditions, ...
Calculation of Lambda modes of the multi-group neutron transport equation using the discrete ordinates and Finite Difference Method

Morató-Rafet, Sergio; Bernal, Á.; Miró Herrero, Rafael; Román Moltó, José Enrique; Verdú Martín, Gumersindo Jesús (Elsevier, 2020-03)

[EN] The method explained in this paper solves the steady-state of the neutron transport equation for 1D and 2D systems modeled with Cartesian geometry, by using the Discrete Ordinates method SN for the angular discretization ...
Calculation of multiple eigenvalues of the neutron diffusion equation discretized with a parallelized finite volume method

Bernal-Garcia, Alvaro; Roman, Jose E.; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús (Elsevier, 2018)

[EN] The spatial distribution of the neutron flux within the core of nuclear reactors is a key factor in nuclear safety. The easiest and fastest way to determine it is by solving the eigenvalue problem of the neutron ...
Cálculo de la exponencial de una matriz en SLEPc

Nadal Durá, Javier (Universitat Politècnica de València, 2014-04-24)

[ES] En muchas aplicaciones, aparece la necesidad de calcular para una matriz A una cierta función f(A), como puede ser la exponencial, el logaritmo, la raíz cuadrada, la función signo u otras. En algunas de estas aplicaciones, ...
Coeficientes de Lagrange

Román Moltó, José Enrique (Universitat Politècnica de València, 2008-05-12)

Se visualizan de forma gráfica los coeficientes de Lagrange, que son los polinomios de grado n que se combinan para realizar la interpolación con n+1 puntos base por la fórmula de Lagrange
Computation of scattering resonances in absorptive and dispersive media with applications to metal-dielectric nano-structures

Araujo C., Juan C.; Campos, Carmen; Engstrom, Christian; Roman, Jose E. (Elsevier, 2020-04-15)

[EN] In this paper we consider scattering resonance computations in optics when the resonators consist of frequency dependent and lossy materials, such as metals at optical frequencies. The proposed computational approach ...
Computing subdominant unstable modes of turbulent plasma with a parallel Jacobi-Davidson eigensolver

Romero Alcalde, Eloy; Román Moltó, José Enrique (Wiley-Blackwell, 2011-12-10)

In the numerical solution of large-scale eigenvalue problems, Davidson-type methods are an increasingly popular alternative to Krylov eigensolvers. The main motivation is to avoid the expensive factorizations that are often ...