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dc.contributor.authorColl Sans, Abel
dc.contributor.authorOñate Ibáñez de Navarra, Eugenio
dc.contributor.authorDadvand, Pooyan
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Resistència de Materials i Estructures a l'Enginyeria
dc.date.accessioned2014-11-10T19:21:48Z
dc.date.created2014
dc.date.issued2014
dc.identifier.citationColl, A.; Oñate, E.; Dadvand, P. "Robust volume mesh generation for non-watertight geometries". Barcelona: Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2014.
dc.identifier.isbn978-84-942844-8-9
dc.identifier.otherhttps://www.scipedia.com/public/Coll_et_al_2014b
dc.identifier.urihttp://hdl.handle.net/2117/24661
dc.description.abstractNowadays large part of the time needed to perform a numerical simulation is spent in preprocessing, especially in the geometry cleaning operations and mesh generation. Furthermore, these operations are not easy to automatize because they depend strongly on each geometrical model and they often need human interaction. Many of these operations are needed to obtain a watertight geometry. Even with a clean geometry, classical unstructured meshing methods (like Delaunay or Advancing Front based ones) present critical weak points like the need of a given quality in the boundary mesh or a relatively smooth size transition. These aspects decrease their robustness and imply an extra effort in order to reach the final mesh. Octree based meshers try to relax some of these requirements. In the present work an octree based mesher for unstructured tetrahedra is presented. The proposed mesher ensures the mesh generation avoiding most of the geometry cleaning operations. It is based in the following steps: fit an octree onto the model, refine it following given criteria, apply a tetrahedra pattern to the octree cells and adapt the tetrahedra close to the contours in order to represent accurately the boundary shape. An important and innovative aspect of the proposed algorithm is it ensures the final mesh preserves the topology and the geometric features of the original model. The method uses a Ray Casting based algorithm for the identification of the inner and outer parts of the volumes involved in the model. This technique allows the mesh generation of volumes even with non-watertight boundaries, and also opens the use of the mesher for immersed methods only applying slight modifications to the algorithm. The main advantages of the presented mesher are: robustness, no need for watertight boundaries, independent on the contour mesh quality, preservation of geometrical features (corners and ridges), original geometric topology guaranteed, accurate representation of the contours, valid for immersed methods, and fast performance. A lot of time in the preprocessing part of the numerical simulation is saved thanks to the robustness of the mesher, which allows skipping most of the geometry cleaning operations. A shared memory parallel implementation of the algorithm has been done. The effectiveness of the algorithm and its implementation has been verified by some validation examples.
dc.language.isoeng
dc.publisherCentre Internacional de Mètodes Numèrics en Enginyeria (CIMNE)
dc.subjectÀrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica
dc.subject.lcshNumerical grid generation (Numerical analysis)
dc.subject.otherCIMNE Monograph
dc.subject.otherMonografía CIMNE
dc.titleRobust volume mesh generation for non-watertight geometries
dc.typeBook
dc.subject.lemacElements finits, Mètode dels
dc.contributor.groupUniversitat Politècnica de Catalunya. (MC)2 - Grup de Mecànica Computacional en Medis Continus
dc.identifier.dlB-23555-2014
dc.relation.publisherversionhttps://books.cimne.com/shop/robust-volume-mesh-generation-for-non-watertight-geometries/
dc.rights.accessOpen Access
local.identifier.drac15260177
dc.description.versionPostprint (published version)
dc.date.lift10000-01-01
local.citation.authorColl, A.; Oñate, E.; Dadvand, P.
local.citation.pubplaceBarcelona
local.citation.otherMonograph CIMNE Nº-146
local.citation.publicationNameRobust volume mesh generation for non-watertight geometries


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