Now showing items 21-40 of 42

  • High-order mesh curving by distortion minimization with boundary nodes free to slide on a 3D CAD representation 

    Ruiz-Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (2016-03)
    Article
    Open Access
    We propose a 3D mesh curving method that converts a straight-sided mesh to an optimal-quality curved high-order mesh that interpolates a CAD boundary representation. The main application of this method is the generation ...
  • High-order mesh generation on CAD geometries 

    Gargallo Peiró, Abel; Roca Navarro, Francisco Javier; Peraire Guitart, Jaume; Sarrate Ramos, Josep (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2013)
    Conference report
    Restricted access - publisher's policy
    We present a technique to extend Jacobian-based distortion (quality) measures for planar triangles to high-order isoparametric elements of any interpolation degree on CAD parameterized surfaces. The resulting distortion ...
  • Inserting curved boundary layers for viscous flow simulation with high-order tetrahedra 

    Gargallo Peiró, Abel; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep; Peraire Guitart, Jaume (Springer, 2013)
    Conference lecture
    Restricted access - publisher's policy
    We propose an a posteriori approach for generating curved meshes for viscous flow simulations composed by high-order tetrahedra. The proposed approach is performed in the following three steps: (1) generate a linear ...
  • Least-squares approximation of affine mappings for sweep mesh generation. Functional analysis and applications 

    Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (2013-01)
    Article
    Open Access
    Sweep methods are one of the most robust techniques to generate hexahedral meshes in extrusion volumes. The main issue in sweep algorithms is the projection of cap surface meshes along the sweep path. The most competitive ...
  • Local bisection for conformal refinement of unstructured 4D simplicial meshes 

    Belda-Ferrín, Guillem; Gargallo-Peiró, Abel; Roca Navarro, Francisco Javier (Barcelona Supercomputing Center, 2019-05-07)
    Conference report
    Open Access
    We present a conformal bisection procedure for local refinement of 4D unstructured simplicial meshes with bounded minimum shape quality. Specifically, we propose a recursive refine-to-conformity procedure in two stages, ...
  • Local dual contributions: representing dual surfaces for block meshing 

    Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (Wiley and Sons, 2010-08-06)
    Article
    Open Access
    In this work we present a tool based on the new concept of local dual contributions for directly representing the topology and the approximated geometry of the dual of a block mesh. This tool allows us to obtain a valid ...
  • Management, design and developement of a mesh generation environment using open source software 

    Roca Navarro, Francisco Javier; Ruiz Gironès, Eloi; Sarrate Ramos, Josep (2009-06-08T08:15:56Z)
    Conference report
    Open Access
    In 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 ...
  • Mesh projection between parametric surfaces 

    Roca Navarro, Francisco Javier; Sarrate Ramos, Josep; Huerta, Antonio (2006-06)
    Article
    Open Access
    This 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 ...
  • On curving high-order hexahedral meshes 

    Gargallo Peiró, Abel; Ruiz Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (Elsevier, 2015)
    Conference lecture
    Open Access
    We 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 ...
  • Optimization of a regularized distortion measure to generate curved high-order unstructured tetrahedral meshes 

    Gargallo Peiró, Abel; Roca Navarro, Francisco Javier; Peraire Guitart, Jaume; Sarrate Ramos, Josep (2015-08-03)
    Article
    Open Access
    We 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 

    Ruiz Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (2014-08)
    Article
    Open Access
    Mesh 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 

    Ruiz-Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (Elsevier, 2014)
    Conference report
    Open Access
    Mesh 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 ...
  • Paving the path towards automatic hexahedral mesh generation 

    Roca Navarro, Francisco Javier (Universitat Politècnica de Catalunya, 2009-07-23)
    Doctoral thesis
    Open Access
    Esta tesis versa sobre el desarrollo de las tecnologías para la generación de mallas de hexaedros. El proceso de generar una malla de hexaedros no es automático y su generación requiere varias horas te trabajo de un ingeniero ...
  • Preserving isotropic element size functions in adaptivity, quadrilateral and hexahedral mesh generation 

    Ruiz-Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (2013)
    Article
    Restricted access - publisher's policy
    In 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 

    Roca Navarro, Francisco Javier; Ruiz-Gironés, Eloi; Sarrate Ramos, Josep (2010)
    Conference report
    Restricted access - publisher's policy
    Two 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 

    Ruiz-Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep; Montenegro Armas, Rafael; Escobar Sánchez, José M. (2015-02-01)
    Article
    Open Access
    In 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 

    Ruiz Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (Sociedad Española de Métodos Numéricos en Ingeniería (SEMNI), 2013)
    Conference report
    Open Access
    It 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 

    Ruiz-Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (2015-07-01)
    Article
    Open Access
    The 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 ...
  • The receding front method applied to hexahedral mesh generation of exterior domains 

    Ruiz-Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (2011-11-30)
    Article
    Open Access
    Two 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 hexahedra in the inner ...
  • Unstructured and semi-structured hexahedral mesh generation methods 

    Sarrate Ramos, Josep; Ruiz-Gironés, Eloi; Roca Navarro, Francisco Javier (Saxe-Coburg, 2014)
    Article
    Open Access
    Discretization techniques such as the finite element method, the finite volume method or the discontinuous Galerkin method are the most used simulation techniques in ap- plied sciences and technology. These methods rely ...