Exploració per autor "Sarrate Ramos, Josep"
Ara es mostren els items 53-72 de 76
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Management, design and developement of a mesh generation environment using open source software
(2009-06-08T08:15:56Z)
Text en actes de congrés
Accés obertIn this paper we present an object oriented implementation of a general-purpose mesh generation environment for geometry-based simulations. The aim of this application is to unify available legacy code and new research ... -
Measuring and improving the geometric accuracy of piece-wise polynomial boundary meshes
(2021-10-15)
Article
Accés obertWe present a new disparity functional to measure and improve the geometric accuracy of a curved high-order mesh that approximates a target geometry model. We have devised the disparity to account for compound models, be ... -
Mesh projection between parametric surfaces
(2006-06)
Article
Accés obertThis paper presents a new algorithm to map a given mesh over a source surface onto a target surface. This projection is determined by means of a least-squares approximation of a transformation defined between the loops of ... -
Métodos numéricos : introducción, aplicaciones y programación
(Edicions UPC, 1998)
Llibre
Accés restringit a la comunitat UPCMediante un enfoque bàsico y aplicado, esta obra aborda varias facetas del cálculo numérico: la presentación de los métodos, el desarrollo de los algoritmos, la programación y su aplicación a la resolución de problemas. ... -
Minimización de la distorsión de mallas formadas por cuadriláteros o hexaedros
(2007)
Article
Accés obertEn este artículo se presenta un algoritmo para la minimización de la medida de la distorsión definida por Oddy para una malla formada por cuadriláteros o hexaedros. Aunque dicha medida ha sido ampliamente utilizada, su ... -
Numerical modeling of undersea acoustics using a partition of unity method with plane waves enrichment
(2016-05)
Article
Accés obertA new 2D numerical model to predict the underwater acoustic propagation is obtained by exploring the potential of the Partition of Unity Method (PUM) enriched with plane waves. The aim of the work is to obtain sound pressure ... -
Numerical modelling of void inclusions in porous media
(Wiley and Sons, 2004-01)
Article
Accés obertNumerical modelling of porous flow in a low-permeability matrix with high-permeability inclusions is a challenging task because the large ratio of permeabilities ill-conditions the finite element system of equations. We ... -
Numerical representation of the quality measures of triangles and triangular meshes
(2003-07)
Article
Accés obertIn this note a new procedure to represent the quality measure for triangles is proposed. The triangles are identified by their three angles and are represented in a bounded domain, called angle representation region, ... -
On curving high-order hexahedral meshes
(Elsevier, 2015)
Comunicació de congrés
Accés obertWe present a new definition of distortion and quality measures for high-order hexahedral (quadrilateral) elements. This definition leads to two direct applications. First, it can be used to check the validity and quality ... -
Optimal collapse simulator for three-dimensional frames
(Universitat Politècnica de Catalunya. Escola Superior d'Enginyers de Camins Canals i Ports de Barcelona, 2011-11-15)
Comunicació de congrés
Accés obertIn this work a limit analysis for 3D structures software package is presented. The goal is to obtain for a certain structure the load factor λ that applied to the external loads induces collapse to the structure. The ... -
Optimization of a regularized distortion measure to generate curved high-order unstructured tetrahedral meshes
(2015-08-03)
Article
Accés obertWe present a robust method for generating high-order nodal tetrahedral curved meshes. The approach consists of modifying an initial linear mesh by first, introducing high-order nodes, second, displacing the boundary nodes ... -
Optimizing mesh distortion by hierarchical iteration relocation of the nodes on the CAD entities
(Elsevier, 2014)
Text en actes de congrés
Accés obertMesh untangling and smoothing is an important part of the meshing process to obtain high-quality discretizations. The usual approach consists on moving the position of the interior nodes while considering fixed the position ... -
Optimizing mesh distortion by hierarchical iteration relocation of the nodes on the CAD entities
(2014-08)
Article
Accés obertMesh untangling and smoothing is an important part of the meshing process to obtain high-quality discretizations. The usual approach consists on moving the position of the interior nodes while considering fixed the position ... -
Particle injection in the LSI+61º303 radio outbursts
(1991)
Article
Accés obertThe binary radio, X-ray and gamma-ray star LSI+ 61 °303 presents periodic radio outbursts, of variable amplitude, with a period of 26.5 d. We propose a description of the radio outbursts using the adiabatic expansion model ... -
Preserving isotropic element size functions in adaptivity, quadrilateral and hexahedral mesh generation
(2013)
Article
Accés restringit per política de l'editorialIn electric circuit theory, it is of great interest to compute the effective resistance between any pair of vertices of a network, as well as the Kirchhoff Index. During the last decade these parametres have been applied ... -
Receding front method: a new approach applied to generate hexahedral meshes of outer domains
(2010)
Text en actes de congrés
Accés restringit per política de l'editorialTwo of the most successful methods to generate unstructured hexahedral meshes are the grid-based methods and the advancing front methods. On the one hand, the grid-based methods generate high quality elements in the inner ... -
Simultaneous untangling and smoothing of quadrilateral and hexahedral meshes using an object-oriented framework
(2015-02-01)
Article
Accés obertIn this work, we present a simultaneous untangling and smoothing technique for quadrilateral and hexahedral meshes. The algorithm iteratively improves a quadrilateral or hexahedral mesh by minimizing an objective function ... -
Size preserving mesh generation in adaptivity processes
(Sociedad Española de Métodos Numéricos en Ingeniería (SEMNI), 2013)
Text en actes de congrés
Accés obertIt is well known that the variations of the element size have to be controlled in order to generate a high-quality mesh. Hence, several techniques have been developed to limit the gradient of the element size. Although ... -
Size-preserving size functions and smoothing procedures for adaptive quadrilateral mesh generation
(2015-07-01)
Article
Accés obertThe generation of meshes that correctly reproduce a prescribed size function is crucial for quadrilateral meshing due to two reasons. First, quadrilateral meshes are difficult to adapt to a given size field by refining or ... -
Spectral analysis of the Beznar dam accelerogram. Comparison with results in the northeastern of Spain
(1991-12)
Article
Accés obertNumerical analysis applied to the Beznar dam accelerograms (longitudinal and transversal components) shows that the Fourier amplitude spectrum is a good approximation to the pseudo-velocity spectra. Thís fact makes possible ...
