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Littérature scientifique sur le sujet « Unstructured meshe »

Auteur : Grafiati

Publié le 11 mars 2023

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Articles de revues sur le sujet "Unstructured meshe"

SCHNEIDERS, ROBERT. « OCTREE-BASED HEXAHEDRAL MESH GENERATION ». International Journal of Computational Geometry & ; Applications 10, n^o 04 (août 2000) : 383–98. http://dx.doi.org/10.1142/s021819590000022x.

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An octree-based algorithm for the generation of hexahedral element meshes is presented. The algorithm works in three steps: (i) The geometry to be meshed is approximated by an octree structure. (ii) An unstructured hexahedral element mesh is derived from the octree. (iii) The mesh is adapted to the boundary of the geometry. We focus on step (ii) and describe an algorithm that constructs a hex mesh for a given octree structure.

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Noleto, Luciano Gonçalves, Manuel N. D. Barcelos et Antonio C. P. Brasil. « A Pseudo-Stokes Mesh Motion Algorithm ». Advances in Applied Mathematics and Mechanics 5, n^o 2 (avril 2013) : 194–211. http://dx.doi.org/10.4208/aamm.11-m1186.

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AbstractThis work presents a moving mesh methodology based on the solution of a pseudo flow problem. The mesh motion is modeled as a pseudo Stokes problem solved by an explicit finite element projection method. The mesh quality requirements are satisfied by employing a null divergent velocity condition. This methodology is applied to triangular unstructured meshes and compared to well known approaches such as the ones based on diffusion and pseudo structural problems. One of the test cases is an airfoil with a fully meshed domain. A specific rotation velocity is imposed as the airfoil boundary condition. The other test is a set of two cylinders that move toward each other. A mesh quality criteria is employed to identify critically distorted elements and to evaluate the performance of each mesh motion approach. The results obtained for each test case show that the pseudo-flow methodology produces satisfactory meshes during the moving process.

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Cai, Jian, Lan Chen et Umezuruike Linus Opara. « Numerical Simulation of Powder Dispersion Performance by Different Mesh Types ». Key Engineering Materials 680 (février 2016) : 82–85. http://dx.doi.org/10.4028/www.scientific.net/kem.680.82.

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OBJECTIVE To investigate the influence of mesh type on numerical simulating the dispersion performance of micro-powders through a home-made tube. METHODS With the computational fluid dynamics (CFD) method, a powder dispersion tube was meshed in three different types, namely, tetrahedral, unstructured hexahedral and prismatic-tetrahedral hybrid meshes. The inner flow field and the kinetic characteristics of the particles were investigated. Results of the numerical simulation were compared with literature evidences. RESULTS The results showed that using tetrahedral mesh had the highest computational efficiency, while employing the unstructured hexahedral mesh obtained more accurate outlet velocity. The simulation results of the inner flow field and the kinetic characteristics of the particles were slightly different among the three mesh types. The calculated particle velocity using the tetrahedral mesh had the best correlation with the changing trend of the fine particle mass in the first 4 stages of the new generation impactor (NGI) (R2 = 0.91 and 0.89 for powder A and B, respectively). Conclusions Mesh type affected computational time, accuracy of simulation results and the prediction abilities of fine particle deposition.

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Song, Tao, Jiarong Wang, Danya Xu, Wei Wei, Runsheng Han, Fan Meng, Ying Li et Pengfei Xie. « Unsupervised Machine Learning for Improved Delaunay Triangulation ». Journal of Marine Science and Engineering 9, n^o 12 (7 décembre 2021) : 1398. http://dx.doi.org/10.3390/jmse9121398.

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Physical oceanography models rely heavily on grid discretization. It is known that unstructured grids perform well in dealing with boundary fitting problems in complex nearshore regions. However, it is time-consuming to find a set of unstructured grids in specific ocean areas, particularly in the case of land areas that are frequently changed by human construction. In this work, an attempt was made to use machine learning for the optimization of the unstructured triangular meshes formed with Delaunay triangulation in the global ocean field, so that the triangles in the triangular mesh were closer to equilateral triangles, the long, narrow triangles in the triangular mesh were reduced, and the mesh quality was improved. Specifically, we used Delaunay triangulation to generate the unstructured grid, and then developed a K-means clustering-based algorithm to optimize the unstructured grid. With the proposed method, unstructured meshes were generated and optimized for global oceans, small sea areas, and the South China Sea estuary to carry out data experiments. The results suggested that the proportion of triangles with a triangle shape factor greater than 0.7 amounted to 77.80%, 79.78%, and 79.78%, respectively, in the unstructured mesh. Meanwhile, the proportion of long, narrow triangles in the unstructured mesh was decreased to 8.99%, 3.46%, and 4.12%, respectively.

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Gustafsson, Tom. « simple technique for unstructured mesh generation via adaptive finite elements ». Rakenteiden Mekaniikka 54, n^o 2 (14 juin 2021) : 69–79. http://dx.doi.org/10.23998/rm.99648.

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This work describes a concise algorithm for the generation of triangular meshes with the help of standard adaptive finite element methods. We demonstrate that a generic adaptive finite element solver can be repurposed into a triangular mesh generator if a robust mesh smoothing algorithm is applied between the mesh refinement steps. We present an implementation of the mesh generator and demonstrate the resulting meshes via examples.

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Schneider, Teseo, Yixin Hu, Xifeng Gao, Jérémie Dumas, Denis Zorin et Daniele Panozzo. « A Large-Scale Comparison of Tetrahedral and Hexahedral Elements for Solving Elliptic PDEs with the Finite Element Method ». ACM Transactions on Graphics 41, n^o 3 (30 juin 2022) : 1–14. http://dx.doi.org/10.1145/3508372.

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The Finite Element Method (FEM) is widely used to solve discrete Partial Differential Equations (PDEs) in engineering and graphics applications. The popularity of FEM led to the development of a large family of variants, most of which require a tetrahedral or hexahedral mesh to construct the basis. While the theoretical properties of FEM basis (such as convergence rate, stability, etc.) are well understood under specific assumptions on the mesh quality, their practical performance, influenced both by the choice of the basis construction and quality of mesh generation, have not been systematically documented for large collections of automatically meshed 3D geometries. We introduce a set of benchmark problems involving most commonly solved elliptic PDEs, starting from simple cases with an analytical solution, moving to commonly used test problem setups, and using manufactured solutions for thousands of real-world, automatically meshed geometries. For all these cases, we use state-of-the-art meshing tools to create both tetrahedral and hexahedral meshes, and compare the performance of different element types for common elliptic PDEs. The goal of this benchmark is to enable comparison of complete FEM pipelines, from mesh generation to algebraic solver, and exploration of relative impact of different factors on the overall system performance. As a specific application of our geometry and benchmark dataset, we explore the question of relative advantages of unstructured (triangular/ tetrahedral) and structured (quadrilateral/hexahedral) discretizations. We observe that for Lagrange-type elements, while linear tetrahedral elements perform poorly, quadratic tetrahedral elements perform equally well or outperform hexahedral elements for our set of problems and currently available mesh generation algorithms. This observation suggests that for common problems in structural analysis, thermal analysis, and low Reynolds number flows, high-quality results can be obtained with unstructured tetrahedral meshes, which can be created robustly and automatically. We release the description of the benchmark problems, meshes, and reference implementation of our testing infrastructure to enable statistically significant comparisons between different FE methods, which we hope will be helpful in the development of new meshing and FEA techniques.

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Gruzintsev, I., M. Kornilina et M. Yakobovskiy. « Adaptive 3D unstructured mesh refinement ». E3S Web of Conferences 224 (2020) : 01011. http://dx.doi.org/10.1051/e3sconf/202022401011.

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Algorithms for generating three-dimensional detailed computational meshes are considered. The algorithms are based on adaptive refinement of the original coarse meshes describing a 3D object. The purpose of adaptation is to form an accurate description of the volume and surface of a three-dimensional object for supercomputer modeling. Refinement of the boundary description is performed by projecting the cut elements of the coarse mesh onto the corresponding elements of the object’s surface.

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Peng, Biao, Chunhua Zhou et Junqiang Ai. « Solution Reconstruction on Unstructured Tetrahedral Meshes Using P1-Conservative Interpolation ». Advances in Applied Mathematics and Mechanics 8, n^o 5 (8 juillet 2016) : 847–70. http://dx.doi.org/10.4208/aamm.2015.m1087.

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AbstractThis paper extends an algorithm of P1-conservative interpolation on triangular meshes to tetrahedral meshes and thus constructs an approach of solution reconstruction for three-dimensional problems. The conservation property is achieved by local mesh intersection and the mass of a tetrahedron of the current mesh is calculated by the integral on its intersection with the background mesh. For each current tetrahedron, the overlapped background tetrahedrons are detected efficiently. A mesh intersection algorithm is proposed to construct the intersection of a current tetrahedron with the overlapped background tetrahedron and mesh the intersection region by tetrahedrons. A localization algorithm is employed to search the host units in background mesh for each vertex of the current mesh. In order to enforce the maximum principle and avoid the loss of monotonicity, correction of nodal interpolated solution on tetrahedral meshes is given. The performance of the present solution reconstruction method is verified by numerical experiments on several analytic functions and the solution of the flow around a sphere.

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Gao, Song, Jory Seguin, Wagdi G. Habashi, Dario Isola et Guido Baruzzi. « A finite element solver for hypersonic flows in thermo-chemical non-equilibrium, Part II ». International Journal of Numerical Methods for Heat & ; Fluid Flow 30, n^o 2 (19 août 2019) : 575–606. http://dx.doi.org/10.1108/hff-12-2018-0725.

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Purpose This work aims to describe the physical and numerical modeling of a CFD solver for hypersonic flows in thermo-chemical non-equilibrium. This paper is the second of a two-part series that concerns the application of the solver introduced in Part I to adaptive unstructured meshes. Design/methodology/approach The governing equations are discretized with an edge-based stabilized finite element method (FEM). Chemical non-equilibrium is simulated using a laminar finite-rate kinetics, while a two-temperature model is used to account for thermodynamic non-equilibrium. The equations for total quantities, species and vibrational-electronic energy conservation are loosely coupled to provide flexibility and ease of implementation. To accurately perform simulations on unstructured meshes, the non-equilibrium flow solver is coupled with an edge-based anisotropic mesh optimizer driven by the solution Hessian to carry out mesh refinement, coarsening, edge swapping and node movement. Findings The paper shows, through comparisons with experimental and other numerical results, how FEM + anisotropic mesh optimization are the natural choice to accurately simulate hypersonic non-equilibrium flows on unstructured meshes. Three-dimensional test cases demonstrate how, for high-speed flows, shocks resolution, and not necessarily boundary layers resolution, is the main driver of solution accuracy at walls. Equally distributing the error among all elements in a suitably defined Riemannian space yields highly anisotropic grids that feature well-resolved shock waves. The resulting high level of accuracy in the computation of the enthalpy jump translates into accurate wall heat flux predictions. At the opposite end, in all cases examined, high-quality but isotropic unstructured meshes gave very poor solutions with severely inadequate heat flux distributions not even featuring expected symmetries. The paper unequivocally demonstrates that unstructured anisotropically adapted meshes are the best, and may be the only, way for accurate and cost-effective hypersonic flow solutions. Originality/value Although many hypersonic flow solvers are developed for unstructured meshes, few numerical simulations on unstructured meshes are presented in the literature. This work demonstrates that the proposed approach can be used successfully for hypersonic flows on unstructured meshes.

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Knupp, Patrick M. « Algebraic mesh quality metrics for unstructured initial meshes ». Finite Elements in Analysis and Design 39, n^o 3 (janvier 2003) : 217–41. http://dx.doi.org/10.1016/s0168-874x(02)00070-7.

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Thèses sur le sujet "Unstructured meshe"

Dapogny, Charles. « Shape optimization, level set methods on unstructured meshes and mesh evolution ». Paris 6, 2013. http://www.theses.fr/2013PA066498.

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L’objectif principal de cette thèse est de concevoir une méthode d’optimisation de structures qui jouitd’une description exacte (i. E. Au moyen d’un maillage) de la forme à chaque itération du processus, touten bénéficiant des avantages de la méthode des lignes de niveaux lorsqu’il s’agit de suivre leur évolution. Indépendamment, on étudie également deux problèmes de modélisation en optimisation structurale. Dans une première partie bibliographique, on présente quelques notions classiques, ainsi qu’un état del’art sommaire autour des trois thématiques principales de la thèse - méthode des lignes de niveaux (Chapitre1), optimisation de formes (Chapitre 2) et maillage (Chapitre 3). La seconde partie de ce manuscrit traite de deux questions en optimisation de formes, celle de la répartitionoptimale de plusieurs matériaux au sein d’une structure donnée (Chapitre 4), et celle de l’optimisation robustede fonctions dépendant du domaine lorsque des perturbations s’exercent sur le modèle (Chapitre 5). Dans une troisième partie, on étudie laconception de schémas numériques en lien avec la méthode deslignes de niveaux lorsque le maillage de calcul est simplicial (et potentiellement adapté). Le calcul de ladistance signée à un domaine est étudié dans le chapitre 6, et la résolution de l’équation de transport d’unefonction ‘level set’ est détaillée dans le chapitre 7. La quatrième partie (Chapitre 8) traite des aspects de la thèse liés à la modification locale de maillagessurfaciques et volumiques. Enfin, la dernière partie (Chapitre 9) détaille la stratégie conçue pour l’évolution de maillage en optimisation de formes, à partir des ingrédients des chapitres 6, 7 et 8
The main purpose of this thesis is to propose a method for structural optimization which combines theaccuracy of featuring an exact description of shapes (i. E. With a mesh) at each iteration of the process withthe versatility of the level set method for tracking their evolution. Independently, we also study two problemsrelated to modeling in structural optimization. In the first, bibliographical part, we present several classical notions, together with some recent developmentsabout the three main issues of this thesis - namely level set methods (Chapter 1), shape optimization(Chapter 2), and meshing (Chapter 3). The second part of this manuscript deals with two issues in shape optimization, that of the optimalrepartition of several materials within a fixed structure (Chapter 4), and that of the robust optimization offunctions depending on the domain when perturbations are expected over the considered mechanical model. In the third part, we study the design of numerical schemes for performing the level set method onsimplicial (and possibly adapted) computational meshes. The computation of the signed distance functionto a domain is investigated in Chapter 6, and the resolution of the level set advection equation is presentedin Chapter 7. The fourth part (Chapter 8) is devoted to the meshing techniques introduced in this thesis. Eventually, the last part (Chapter 9) describes the proposed strategy for mesh evolution in the contextof shape optimization, relying on the numerical ingredients introduced in Chapters 7, 8, 9

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Hindenlang, Florian [Verfasser]. « Mesh Curving Techniques for High Order Parallel Simulations on Unstructured Meshes / Florian Hindenlang ». München : Verlag Dr. Hut, 2014. http://d-nb.info/1060587653/34.

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Harbrecht, Helmut, Ulf Kähler et Reinhold Schneider. « Wavelet Galerkin BEM on unstructured meshes ». Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601459.

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The present paper is devoted to the fast solution of boundary integral equations on unstructured meshes by the Galerkin scheme. On the given mesh we construct a wavelet basis providing vanishing moments with respect to the traces of polynomials in the space. With this basis at hand, the system matrix in wavelet coordinates can be compressed to $\mathcal{O}(N\log N)$ relevant matrix coefficients, where $N$ denotes the number of unknowns. The compressed system matrix can be computed within suboptimal complexity by using techniques from the fast multipole method or panel clustering. Numerical results prove that we succeeded in developing a fast wavelet Galerkin scheme for solving the considered class of problems.

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ROCHA, ALLAN CARLOS AVELINO. « ILLUSTRATIVE VOLUME VISUALIZATION FOR UNSTRUCTURED MESHES ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=18748@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Técnicas de visualização científica criam imagens na tentativa de revelar estruturas e fenômenos complexos. Técnicas ilustrativas têm sido incorporadas aos sistemas de visualizacão científica para melhorar a expressividade de tais imagens. A visualização de linhas caracteríticas é uma técnica importante para transmitir uma melhor informacão sobre a forma das superfícies. Neste trabalho, propomos combinar visualização volumétrica de malhas não estruturadas com isosuperfícies ilustradas. Isto é feito estendendo um algoritmo de traçado de raio em GPU para incorporar ilustração com linhas de variação extrema da iluminação(photic extremum lines), um tipo de linha característica que captura mudanças bruscas de luminância, revelando formas de um jeito perceptualmente correto.
Scientic visualization techniques create images attempting to reveal complex structures and phenomena. Illustrative techniques have been incorporated to scientic visualization systems in order to improve the expressiveness of such images. The rendering of feature lines is an important technique for better depicting surface shapes and features. In this thesis, we propose to combine volume visualization of unstructured meshes with illustrative isosurfaces. This is accomplished by extending a GPU-based ray-casting algorithm to incorporate illustration with photic extremum lines, a type of feature lines able to capture sudden changes of luminance, conveying shapes in a perceptually correct way.

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MIRANDA, FABIO MARKUS NUNES. « VOLUME RENDERING OF UNSTRUCTURED HEXAHEDRAL MESHES ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=28921@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Importantes aplicações de engenharia usam malhas não estruturadas de hexaedros para simulações numéricas. Células hexaédricas, comparadas com tetraedros, tendem a ser mais numericamente estáveis e requerem um menor refinamento da malha. Entretando, visualização volumétrica de malhas não estruturadas é um desafio devido a variação trilinear do campo escalar dentro da célula. A solução convencional consiste em subdividir cada hexaedro em cinco ou seis tetraedros, aproximando uma variação trilinear por uma inadequada série de funções lineares. Isso resulta em imagens inadequadas e aumenta o consumo de memória. Nesta tese, apresentamos um algoritmo preciso de visualização volumétrica utilizando ray-casting para malhas não estruturadas de hexaedros. Para capturar a variação trilinear ao longo do raio, nós propomos usar uma integração de quadratura. Nós também propomos uma alternativa rápida que melhor aproxima a variação trilinear, considerando os pontos de mínimo e máximo da função escalar ao longo do raio. Uma série de experimentos computacionais demonstram que nossa proposta produz resultados exatos, com um menor gasto de memória. Todo algoritmo é implementado em placas gráficas, garantindo uma performance competitiva.
Important engineering applications use unstructured hexahedral meshes for numerical simulations. Hexahedral cells, when compared to tetrahedral ones, tend to be more numerically stable and to require less mesh refinement. However, volume visualization of unstructured hexahedral meshes is challenging due to the trilinear variation of scalar fields inside the cells. The conventional solution consists in subdividing each hexahedral cell into five or six tetrahedra, approximating a trilinear variation by an inadequate piecewise linear function. This results in inaccurate images and increases the memory consumption. In this thesis, we present an accurate ray-casting volume rendering algorithm for unstructured hexahedral meshes. In order to capture the trilinear variation along the ray, we propose the use of quadrature integration. We also propose a fast approach that better approximates the trilinear variation to a series of linear ones, considering the points of minimum and maximum of the scalar function along the ray. A set of computational experiments demonstrates that our proposal produces accurate results, with reduced memory footprint. The entire algorithm is implemented on graphics cards, ensuring competitive performance.

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Burgess, David A. « Parallel computing for unstructured mesh algorithms ». Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318758.

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Perez, Sansalvador Julio. « Parallel unstructured mesh adaptation and applications ». Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/parallel-unstructured-mesh-adaptation-and-applications(26248d4d-48a6-4101-a687-004218e39cb4).html.

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In this thesis we develop 2D parallel unstructured mesh adaptation methods for the solution of partial differential equations (PDEs) by the finite element method (FEM). Additionally, we develop a novel block preconditioner for the iterative solution of the linear systems arising from the finite element discretisation of the Föppl-von Kàrmàn equations. Two of the problems arising in the numerical solution of PDEs by FEM are the memory constraints that limit the solution of large problems, and the inefficiency of solving the associated linear systems by direct or iterative solvers. We initially focus on mesh adaptation, which is a memory demanding task of the FEM. The size of the problem increases by adding more elements and nodes to the mesh during mesh refinement. In problems involving a large number of elements, the problem size is limited by the memory available on a single processor. In order to be able to work with large problems, we use a domain decomposition approach to distribute the problem over multiple processors. One of the main objectives of this thesis is the development of 2D parallel unstructured mesh adaptation methods for the solution of PDEs by the FEM in a variety of problems; including domains with curved boundaries, holes and internal boundaries. Our newly developed methods are implemented in the software library oomph-lib, an open-source object oriented multi-physics software library implementing the FEM. We validate and demonstrate their utility in a set of increasingly complex problems ranging from scalar PDEs to fully coupled multi-physics problems. Having implemented and validated the infrastructure which facilitates the finite-element-based discretisation of PDEs in a distributed environment, we shift our focus to the second problem concerning this thesis and one of the major challenges in the computational solution of PDEs: the solution of the large linear systems arising from their discretisation. For sufficiently large problems, the solution of their associated linear system by direct solvers becomes impossible or inefficient, typically because of memory and time constraints. We therefore focus on preconditioned Krylov subspace methods whose efficiency depends crucially on the provision of a good preconditioner. These preconditioners are invariably problem dependent. We illustrate their application and development in the solution of two elasticity problems which give rise to relatively large problems. First we consider the solution of a linear elasticity problem and compute the stress distribution near a crack tip where strong local mesh refinement is required. We then consider the deformation of thin plates which are described by the nonlinear Föppl-von Kàrmàn equations. A key contribution of this work is the development of a novel block preconditioner for the iterative solution of these equations, we present the development of the preconditioner and demonstrate its practical performance.

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Hindenlang, Florian [Verfasser], et Claus-Dieter [Akademischer Betreuer] Munz. « Mesh curving techniques for high order parallel simulations on unstructured meshes / Florian Hindenlang. Betreuer : Claus-Dieter Munz ». Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2014. http://d-nb.info/1063938082/34.

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Bushrod, Rebecca. « Unstructured mesh generation for mesh improvement techniques and contour meshing ». Thesis, Swansea University, 2005. https://cronfa.swan.ac.uk/Record/cronfa42434.

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This thesis will investigate surface mesh generation and develop ideas to improve the quality of surface meshes that are currently produced. Surface geometries are represented by a CAD definition, but the CAD definition does not necessarily guarantee that the surface geometry is acceptable for mesh generation. CAD geometries will often contain a number of detailed features which will need to be improved by processes such as CAD repair before mesh generation can take place. Even then the geometries can still contain problems in the features such as, small sliver surface patches and sliver edges. These features cause major difficulties when meshed, as they generate small distorted elements. Here we will look to improve the meshes by merging together neighboring surface patches to create a super patch and then generate the mesh on this one surface. The merging of surfaces is controlled by the angle between surface patches. Another method that will be investigated involves the re-meshing of the geometry based on a prescribed metric. In addition to looking at this problem of CAD representation we will also look at the growing area of medical imaging. Here we will look to produce a 3D mesh from a set of contours. From this the mesh produced will be remeshed using the previous ideas to produce a mesh that can be used for analysis.

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Kumar, Amitesh. « Hole patching in 3D unstructured surface mesh ». Birmingham, Ala. : University of Alabama at Birmingham, 2007. http://www.mhsl.uab.edu/dt/2007m/kumar.pdf.

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Livres sur le sujet "Unstructured meshe"

Mavriplis, Dimitri J. Multigrid techniques for unstructured meshes. Hampton, Va : Institute for Computer Applications in Science and Engineering, 1995.

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Dimitri, Mavriplis, et Langley Research Center, dir. Implicit solvers for unstructured meshes. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1991.

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Peraire, Jaime. Unstructured mesh methods for CFD. London, England : Imperial College of Science, Technology and Medicine. Dept. of Aeronautics, 1990.

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Mavriplis, Dimitri J. Unstructured mesh generation and adaptivity. Hampton, Va : Institute for Computer Applications in Science and Engineering, 1995.

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Institute for Computer Applications in Science and Engineering., dir. Unstructured mesh generation and adaptivity. Hampton, VA : Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1995.

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Mavriplis, Dimitri J. Unstructured mesh algorithms for aerodynamic calculations. Hampton, Va : Institute for Computer Applications in Science and Engineering, 1992.

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Bercovier, Michel, et Tanya Matskewich. Smooth Bézier Surfaces over Unstructured Quadrilateral Meshes. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63841-6.

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Bokhari, Shahid H. The tera multithreaded architecture and unstructured meshes. Hampton, VA : Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1998.

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Mavriplis, Dimitri J. Algebraic turbulence modeling for unstructured and adaptive meshes. Hampton, Va : Institute for Computer Applications in Science and Engineering, 1990.

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Mavriplis, Dimitri J. Turbulent flow calculations using unstructured and adaptive meshes. Hampton, Va : Institute for Computer Applications in Science and Engineering, 1990.

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Chapitres de livres sur le sujet "Unstructured meshe"

Löhner, Rainald. « Breakthrough ‘Workarounds’ in Unstructured Mesh Generation ». Dans Mesh Generation and Adaptation, 261–76. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92540-6_12.

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Jung, Mun Seung, et Oh Joon Kwon. « Development of a Conservative Overset Mesh Method on Unstructured Meshes ». Dans Computational Fluid Dynamics 2010, 893–95. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17884-9_118.

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Bercovier, Michel, et Tanya Matskewich. « Introduction ». Dans Smooth Bézier Surfaces over Unstructured Quadrilateral Meshes, 1–24. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63841-6_1.

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Bercovier, Michel, et Tanya Matskewich. « G 1-Smooth Surfaces ». Dans Smooth Bézier Surfaces over Unstructured Quadrilateral Meshes, 25–42. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63841-6_2.

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Bercovier, Michel, et Tanya Matskewich. « MDS : Quadrilateral Meshes and Polygonal Boundary ». Dans Smooth Bézier Surfaces over Unstructured Quadrilateral Meshes, 43–72. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63841-6_3.

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Bercovier, Michel, et Tanya Matskewich. « Global MDS ». Dans Smooth Bézier Surfaces over Unstructured Quadrilateral Meshes, 73–91. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63841-6_4.

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Bercovier, Michel, et Tanya Matskewich. « MDS for a Smooth Boundary ». Dans Smooth Bézier Surfaces over Unstructured Quadrilateral Meshes, 93–136. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63841-6_5.

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Bercovier, Michel, et Tanya Matskewich. « Computational Examples ». Dans Smooth Bézier Surfaces over Unstructured Quadrilateral Meshes, 137–43. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63841-6_6.

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Bercovier, Michel, et Tanya Matskewich. « Conclusions and Further Research ». Dans Smooth Bézier Surfaces over Unstructured Quadrilateral Meshes, 145–47. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63841-6_7.

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Rossow, C. C. « Convergence Acceleration on Unstructured Meshes ». Dans New Results in Numerical and Experimental Fluid Mechanics III, 304–11. Berlin, Heidelberg : Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-540-45466-3_37.

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Actes de conférences sur le sujet "Unstructured meshe"

Turner, Michael, David Moxey, Spencer J. Sherwin et Joaquim Peiro. « AUTOMATIC GENERATION OF 3D UNSTRUCTURED HIGH-ORDER CURVILINEAR MESHE ». Dans VII European Congress on Computational Methods in Applied Sciences and Engineering. Athens : Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2016. http://dx.doi.org/10.7712/100016.1825.8410.

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Lepage, C., F. Suerich-Gulick et W. Habashi. « Anisotropic 3-D mesh adaptation on unstructured hybrid meshes ». Dans 40th AIAA Aerospace Sciences Meeting & Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-859.

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Sheng, Chunhua, et Christian Allen. « Efficient Mesh Deformation Using Radial Basis Functions on Unstructured Meshes ». Dans 42nd AIAA Fluid Dynamics Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-2685.

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Hidalgo, Victor, XianWu Luo, Xavier Escaler, An Yu et Esteban Valencia. « Study of Partial Cavitation on a Plane-Convex Hydrofoil With Mesh Development by Using GMSH Free Software ». Dans ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-05531.

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Commercial programs are widely used to do unstructured and structured meshes for CFD simulations. However, grids and meshes based on free-open source software (FOSS) give to researchers and engineers the possibility to adapt and improve the meshing process for special study cases with a high Reynolds numbers, such as unsteady partial cavitating flows. In order to improve the grid qualities, the FOSS GMSH has been used to do three types of grid, unstructured hexahedral mesh, hybrid mesh and structured hexahedral mesh for the simulation of partial cavitation around a plane-convex hydrofoil. Numerical simulations have been carried out by using the FOSS OpenFOAM based on the Zwart cavitation model and the implicit large eddy simulation (ILES). The results show that the structured mesh provides the best simulating to experimental data. On the other hand, the hybrid mesh induces unreliable results at leading edge without shedding.

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Podshivalov, Lev, Anath Fischer et Pinhas Z. Bar-Yoseph. « Performance Assessment of Hexahedral Meshing Methods for Design and Mechanical Analysis of Composite Materials ». Dans ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82247.

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Composite materials can be designed and modeled as material volumes with inclusions of several materials. These multiple inclusions are randomly distributed in a unit cube volume according to the material parameters (density, dimensions, orientation etc.). Then, the finite element (FE) analysis method is applied on the resulting structure to estimate the equivalent material properties. Therefore, these models should to be meshed prior to mechanical FE analysis. Automatic high quality hexahedral meshing is considered a very complex task. Hence, despite extensive research, currently there are no robust methods that can handle grain-based geometry. Meshing a composite material modeled by multiple inclusions presents a number of challenges: (a) the meshing needs to be robust to dimensions, position and orientation of the inclusions; (b) mesh continuity must be achieved on the boundaries between the volume (also known as the matrix) and the inclusions; (c) the mesh needs to approximate the original geometric model with high accuracy; and (d) high quality mesh elements are required for mechanical analysis. Structured and unstructured meshing methods can be used for handling this task. In this research two meshing methods were developed to generate high quality meshes: (a) structured meshing created by warping the grid according to the model’s geometry, and (b) unstructured meshing created by projecting the nodes onto the boundaries of the inclusions to achieve exact geometric representation. The performance of these methods was then evaluated and compared on composite materials with ellipsoidal inclusions. Among the performance criteria for these methods are mesh element quality, geometry approximation error, stress concentrations near the boundaries, and computational complexity. The results indicate that the proposed methods can be used for design and mechanical analysis of composite materials. Moreover, in homogenization applications the structured warped mesh is compatible in terms of performance and element quality to the unstructured mesh.

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da Silva Tonon, Daniel, Jesuíno Takachi Tomita, Ezio Castejon Garcia, Cleverson Bringhenti, Rubén Bruno Díaz et Luiz Henrique Lindquist Whitacker. « Comparative Study Between Structured and Unstructured Meshes Applied in Turbopump’s Hydraulic Turbine ». Dans ASME Turbo Expo 2020 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15004.

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Abstract The aim of this work is the evaluation of different mesh types applied in turbomachines area, in this case in an axial turbine stage used in turbopumps (TP) applications. The tip clearance region was considered in this study because it has high influence in turbomachines performance. Due to the complexity of the tip clearance region, structured mesh generation is not always feasible, therefore it is necessary to generate unstructured meshes that allow flow calculation through Computational Fluid Dynamics (CFD) techniques. The use of different mesh type is an interesting topic when different rotor tip geometries are evaluated, in which the desensitization methods are applied. In this work, only the common flat-tip was consider. Thus, as a first step, unstructured tetrahedral meshes (with prismatic layers close to the surfaces) with different y+ values were generated. After this, turbulent 3-D flow calculations were performed at design and off design conditions, based con Reynolds Averaged Navier-Stokes (RANS) equations. The methodology used is to present in a didactic way, for under and graduate students, the advantages and disadvantages of the unstructured mesh in relation to the structured one, already used in previous research. Unstructured meshes were generated using ICEM software (ANSYS), while structured ones were generated using AxCent software developed by CONCEPTS NREC. The machine under study is the first stage of the hydraulic axial turbine used in the Low Pressure Oxidizer Turbopump (LPOTP) of the Space Shuttle Main Engine (SSME), considering 3.0% tip clearance configuration relative to blade height. All simulations were done using CFX program (ANSYS). The result shows the comparison between the two mesh types considering the difficulty and time generation, discretization quality, effect of y+ parameter variation on flowfield, simulation time, and stage performance parameters calculation for different operating points.

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Richardson, Scott M. « Transonic Turbomachinery Calculations Using a Hybrid Structured-Unstructured Grid Method ». Dans ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-062.

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A method is presented for solving the two-dimensional Navier-Stokes equations on a solution-adaptive grid of both structured and unstructured meshes. Flow near airfoil surfaces is modeled using an implicit finite difference algorithm on a structured O-type mesh. The flow equations in the blade passages are written in a cell-vertex finite volume formulation and are solved on an unstructured mesh using a Runge-Kutta explicit algorithm. Both the structured and unstructured grid also include solution dependent adaptation to allow resolution of flow features with a minimum of grid points. The structured mesh divides to locally add grid lines, while the unstructured mesh allows the addition or removal of individual cells. An overlapping interface region is used to conservatively communicate flow variable information between the two grids. The quasi-three-dimensional effects of streamtube contraction and radius change are included to allow calculation of modern turbomachine designs. A study is included to determine the effect on cacade parameters of inclusion of viscous terms in the solution of the flow equations in the unstructured domain. Quasi-three-dimensional computations of flow through a transonic compressor and turbine cascade are compared with experimental data.

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Yang, Hong, et Leiyong Jiang. « A Dual-Mesh Approach to Enhance Accuracy of the Boundary Conditions for Unstructured Grid Modeling of Turbomachinery Flows ». Dans ASME Turbo Expo 2010 : Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23390.

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Although unstructured grids have gained wide acceptance in many engineering applications, they still suffer from difficulties in achieving high accuracy at the inflow, outflow and mixing-plane interface boundaries of multi-stage turbomachinery configurations. To overcome these difficulties and hence to increase the accuracy of unstructured grid methods, a novel dual mesh approach is proposed. In contrast to conventional CFD techniques, the dual mesh approach works on two sets of meshes at the boundaries: one is the original mesh and the other is an auxiliary surface mesh created at run time. By properly coupling of such double meshes, the dual mesh approach can effectively increase the accuracy and conservation of the solutions at the inflow, outflow and mixing-plane interface boundaries, and it can also enjoy most of the sophisticated numerical algorithms originally developed for the structured-grid boundary conditions. With both compressor and turbine test cases, the dual mesh approach is demonstrated to be superior to the conventional method while its CPU-time penalty is marginal. Additionally the dual mesh approach may be also useful for any structured CFD solvers subject to some restrictions on the structured grid distributions at the inflow, outflow and mixing-plane interface boundaries, e.g. mesh uniformity in the circumferential direction.

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Katz, Aaron, et Venkateswaran Sankaran. « Mesh Quality Effects on the Accuracy of CFD Solutions on Unstructured Meshes ». Dans 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-652.

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Yang, ZhiJian, et Dimitri Mavriplis. « A Mesh Deformation Strategy Optimized by the Adjoint Method on Unstructured Meshes ». Dans 45th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-557.

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Rapports d'organisations sur le sujet "Unstructured meshe"

Smith, William G., et Michael P. Ebert. A Method for Unstructured Mesh-to-Mesh Interpolation. Fort Belvoir, VA : Defense Technical Information Center, août 2010. http://dx.doi.org/10.21236/ada531390.

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Spencer, Joshua Bradly, et Jennifer Louise Alwin. Big Ten MCNP6 Unstructured Mesh Benchmark. Office of Scientific and Technical Information (OSTI), juin 2019. http://dx.doi.org/10.2172/1529515.

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Dzur, Micky, Jerawan Armstrong et Chelsea D'Angelo. MCNP Unstructured Mesh Verification : Oktavian Models. Office of Scientific and Technical Information (OSTI), août 2022. http://dx.doi.org/10.2172/1881771.

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Ansari, S. M., E. M. Schetselaar et J. A. Craven. Three-dimensional magnetotelluric modelling of the Lalor volcanogenic massive-sulfide deposit, Manitoba. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328003.

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Unconstrained magnetotelluric inversion commonly produces insufficient inherent resolution to image ore-system fluid pathways that were structurally thinned during post-emplacement tectonic activity. To improve the resolution in these complex environments, we synthesized the 3-D magnetotelluric (MT) response for geologically realistic models using a finite-element-based forward-modelling tool with unstructured meshes and applied it to the Lalor volcanogenic massive-sulfide deposit in the Snow Lake mining camp, Manitoba. This new tool is based on mapping interpolated or simulated resistivity values from wireline logs onto unstructured tetrahedral meshes to reflect, with the help of 3-D models obtained from lithostratigraphic and lithofacies drillhole logs, the complexity of the host-rock geological structure. The resulting stochastic model provides a more realistic representation of the heterogeneous spatial distribution of the electric resistivity values around the massive, stringer, and disseminated sulfide ore zones. Both models were combined into one seamless tetrahedral mesh of the resistivity field. To capture the complex resistivity distribution in the geophysical forward model, a finite-element code was developed. Comparative analyses of the forward models with MT data acquired at the Earth's surface show a reasonable agreement that explains the regional variations associated with the host rock geological structure and detects the local anomalies associated with the MT response of the ore zones.

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Jones, M. T., et P. E. Plassmann. Computational results for parallel unstructured mesh computations. Office of Scientific and Technical Information (OSTI), décembre 1994. http://dx.doi.org/10.2172/34394.

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Leiendecker, Harrison, Alex Warhover, Jerawan Armstrong et Jim Ferguson. Code Verification for MCNP Unstructured Mesh Geometry. Office of Scientific and Technical Information (OSTI), août 2020. http://dx.doi.org/10.2172/1647184.

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Kuprat, A. Adaptive smoothing techniques for 3-D unstructured meshes. Office of Scientific and Technical Information (OSTI), avril 1996. http://dx.doi.org/10.2172/226042.

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Spencer, Joshua Bradly, Roger Lee Martz et Jennifer Louise Alwin. Introduction to the MCNP6 Unstructured Mesh Geometry Capability. Office of Scientific and Technical Information (OSTI), mai 2018. http://dx.doi.org/10.2172/1438161.

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Alwin, Jennifer Louise, et Joshua Bradly Spencer. Critical Experiment Benchmark Results using MCNP6.2 Unstructured Mesh. Office of Scientific and Technical Information (OSTI), septembre 2019. http://dx.doi.org/10.2172/1565798.

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J. MOREL, J. MCGHEE et ET AL. 3-D UNSTRUCTURED HEXAHEDRAL-MESH Sn TRANSPORT METHODS. Office of Scientific and Technical Information (OSTI), novembre 2000. http://dx.doi.org/10.2172/768173.

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