Exploració per autor "Díez, Pedro"
Ara es mostren els items 21-40 de 145
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Accurate recovery-based upper error bounds for the extended finite element framework
Ródenas García, Juan José; González Estrada, O. A.; Díez, Pedro; Fuenmayor, F. J. (2010-08-01)
Article
Accés obertThis paper introduces a recovery-type error estimator yielding upper bounds of the error in energy norm for linear elastic fracture mechanics problems solved using the extended finite element method (XFEM). The paper can ... -
Accurate upper and lower error bounds by solving flux-free local problems in
Díez, Pedro; Parés Mariné, Núria; Huerta, Antonio (2004-12)
Article
Accés obertTwo implicit residual type estimators yielding upper bounds of the error are presented which do not require flux equilibration. One of them is based on the ideas introduced in [MAC 00, CAR 99, MOR 03, PRU 02]. The new ... -
Adaptació de l’ensenyament semipresencial dels mètodes numèrics dins del marc del sistema ects
Sarrate Ramos, Josep; Rodríguez Ferran, Antonio; Fernández Méndez, Sonia; Sevilla Cárdenas, Rubén; Rozados, Oriol; Díez, Pedro; Huerta, Antonio (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2008-02-07)
Text en actes de congrés
Accés obertEn l’actualitat els mètodes numèrics s’han consolidat com una disciplina horitzontal en l’àmbit de l’enginyeria civil. En aquest sentit, les assignatures bàsiques relacionades directament amb els mètodes numèrics han ... -
Adaptive finite element strategies based on error assessment
Huerta, Antonio; Rodríguez Ferran, Antonio; Díez, Pedro; Sarrate Ramos, Josep (Wiley and Sons, 1999-09)
Article
Accés obertTwo main ingredients are needed for adaptive finite element computations. First, the error of a given solution must be assessed, by means of either error estimators or error indicators. After that, a new spatial discretization ... -
Adaptive reduced basis strategy based on goal oriented error assessment for stochastic problems
Florentin, Eric; Díez, Pedro (2012-06)
Article
Accés obertIn the framework of stochastic non-intrusive finite element modeling, a common practice is using Monte Carlo simulation. The main drawback of this approach is the computational cost, because it requires computing a large ... -
Adaptive surrogates of crashworthiness models for multi-purpose engineering analyses accounting for uncertainty
Rocas Alonso, Marc; García González, Alberto; Larráyoz Izcara, Xabier; Díez, Pedro (2022-06-01)
Article
Accés obertUncertainty Quantification (UQ) is a booming discipline for complex computational models based on the analysis of robustness, reliability and credibility. UQ analysis for nonlinear crash models with high dimensional outputs ... -
Adaptividade e estimativas de erro orientadas por metas aplicadas a um benchmark test de propagação de onda
Steffens, Lindaura; Díez, Pedro; Parés Mariné, Núria; Alves, Marcelo Krajnc (2016-01-12)
Article
Accés obertO objetivo deste artigo é estudar a eficiência e a robustez de técnicas adaptativas e estimativas de erro orientadas por metas para um benchmark test. As técnicas utilizadas aqui são baseadas em um simples pós-processo das ... -
Adaptivity based on error estimation for viscoplastic softening materials
Díez, Pedro; Arroyo Balaguer, Marino; Huerta, Antonio (2000-02)
Article
Accés obertThis paper focuses on the numerical simulation of strain softening mechanical problems. Two problems arise: (1) the constitutive model has to be regular and (2) the numerical technique must be able to capture the two scales ... -
Algebraic and parametric solvers for the power flow problem: towards real-time and accuracy-guaranteed simulation of electric systems
García Blanco, Raquel; Díez, Pedro; Borzacchiello, Domenico; Chinesta, Francisco (2018-11)
Article
Accés obertThe power flow model performs the analysis of electric distribution and transmission systems. With this statement at hand, in this work we present a summary of those solvers for the power flow equations, in both algebraic ... -
Algebraic PGD for tensor separation and compression: an algorithmic approach
Díez, Pedro; Zlotnik, Sergio; García González, Alberto; Huerta, Antonio (2018-07)
Article
Accés obertProper Generalized Decomposition (PGD) is devised as a computational method to solve high-dimensional boundary value problems (where many dimensions are associated with the space of parameters defining the problem). The ... -
An algorithm for mesh refinement and un-refinement in fast transient dynamics
Casadei, Folco; Díez, Pedro; Verdugo Rojano, Francesc (2013-08)
Article
Accés obertA procedure to locally refine and un-refine an unstructured computational grid of four-node quadrilaterals (in 2D) or of eight-node hexahedra (in 3D) is presented. The chosen refinement strategy generates only elements of ... -
An efficient and general approach for implementing thermodynamic phase equilibria information in geophysical and geodynamic studies
Afonso, Juan Carlos; Zlotnik, Sergio; Díez, Pedro (2015-10-25)
Article
Accés obertWe present a flexible, general, and efficient approach for implementing thermodynamic phase equilibria information (in the form of sets of physical parameters) into geophysical and geodynamic studies. The approach is based ... -
An error estimator for real-time simulators based on model order reduction
Alfaro, Icíar; González, David; Zlotnik, Sergio; Díez, Pedro; Cueto Prendes, Elias; Chinesta, Francisco (Springer, 2015-11-26)
Article
Accés obertModel order reduction (MOR) is one of the most appealing choices for real-time simulation of non-linear solids. In this work a method is presented in which real time performance is achieved by means of the o -line solution ... -
An unfitted method with elastic bed boundary conditions for the analysis of heterogeneous arterial sections
Gahima, Stephan; Díez, Pedro; Stefanati, Marco; Rodríguez Matas, José Félix; García González, Alberto (Multidisciplinary Digital Publishing Institute (MDPI), 2023-04-06)
Article
Accés obertThis manuscript presents a novel formulation for a linear elastic model of a heterogeneous arterial section undergoing uniform pressure in a quasi-static regime. The novelties are twofold. First, an elastic bed support on ... -
Análisis de diferentes estimadores de error de postproceso para adaptatividad orientada al resultado
Calderón, Giovanni; Díez, Pedro (Universitat Politècnica de Catalunya, 2006)
Article
Accés obertEn las aplicaciones prácticas la resolución numérica de un problema de contorno requiere controlar la calidad de la solución aproximada. Si bien hasta hace no mucho se utilizaba generalmente una medida energética del error, ... -
Análisis de diferentes estimadores de error de postproceso para adaptatividad orientada al resultado
Calderón, Giovanni; Díez, Pedro (2006-01)
Article
Accés obertEn las aplicaciones prácticas, la resolución numérica de un problema de contorno requiere controlar la calidad de la solución aproximada. Si bien hasta hace no mucho se utilizaba generalmente una medida energética del ... -
Assembling sparse matrices in MATLAB
Zlotnik, Sergio; Díez, Pedro (2010)
Article
Accés restringit per política de l'editorialThe assembly of sparse matrices is a key operation in finite element methods. In this study we analyze several factors that may have an influence on the efficiency of the assembly procedure. Different insertion strategies ... -
Bonding performance of glass fiber-reinforced polymer bars under the influence of deformation characteristics
Xie, Fang; Tian, Wanming; Díez, Pedro; Zlotnik, Sergio; García González, Alberto (Multidisciplinary Digital Publishing Institute (MDPI), 2023-06-07)
Article
Accés obertGlass fiber-reinforced polymer (GFRP) of high performance, as a relatively ideal partial or complete substitute for steel, could increase the possibility of adapting structures to changes in harsh weather environments. ... -
Bounds for quantities of interest and adaptivity in the element-free Galerkin method
Vidal Seguí, Yolanda; Parés Mariné, Núria; Díez, Pedro; Huerta, Antonio (Wiley and Sons, 2008-07)
Article
Accés obertA novel approach to implicit residual-type error estimation in mesh-free methods and an adaptive refinement strategy are presented. This allows computing upper and lower bounds of the error in energy norm with the ultimate ... -
Bounds of functional outputs for parabolic problems. Part I: Exact bounds of the discontinuous Galerkin time discretization
Parés Mariné, Núria; Díez, Pedro; Huerta, Antonio (2008-03)
Article
Accés obertClassical implicit residual type error estimators require using an underlying spatial finer mesh to compute bounds for some quantity of interest. Consequently, the bounds obtained are only guaranteed asymptotically that ...