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检索条件"丛书名=Lecture Notes in Computational Science and Engineering 37"

共 864 条记录，以下是1-10 订阅

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Explicit Interpolation-Based CFD Mesh Morphing

Explicit Interpolation-Based CFD Mesh Morphing

引用

International Meshing Roundtable Workshop (IMR)

作者： Malcevic, Ivan Mousavi, Arash Gen Elect Res Ctr Niskayuna NY 12309 USA Gen Elect Aerosp Evendale OH USA

ISBN: (纸本)9783031405969;9783031405945;9783031405938

This paper describes mesh morphing methodology based on explicit interpolation. The method handles large displacements while maintaining high mesh quality, has a fast run time, scales linearly with mesh size, and can easily be parallelized to many processing units. The method was originally developed to morph multi-block structured CFD meshes. Blocking topology is used to establish connectivity between domain boundary surfaces and to guide domain decomposition strategy. Blocking layout also defines interpolation direction and drives decisions on interpolation order and smoothness which are important to control the mesh quality. The method is combined with several pre-processing concepts to extend it to the morphing of unstructured CFD meshes. Shrink-wrap, domain decomposition, and automated blocking are combined to generate a structured background mesh used as the backbone of the morphing process. The resulting process efficiently morphs unstructured meshes with large surface displacements. Morphing capabilities are illustrated in several turbomachinery and external flow applications. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Background mesh computational fluid dynamics Interpolation Mesh morphing Structured and unstructured mesh

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Robust Generation of Quadrilateral/Prismatic Boundary Layer Meshes Based on Rigid Mapping

Robust Generation of Quadrilateral/Prismatic Boundary Layer ...

引用

International Meshing Roundtable Workshop (IMR)

作者： Ye, Hongfei Liu, Taoran Chen, Jianjun Zheng, Yao Zhejiang Univ Ctr Engn & Sci Computat Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9783031405969;9783031405945;9783031405938

Quadrilateral/prismatic boundary layer meshes are believed to combine precision with ease of use. However, the generation of full-layer boundary layer meshes without transition elements still needs to encounter the problem of robustness. This paper proposes a novel and robust full-layer boundary layer mesh generation scheme, which constructs an orthogonal target mesh and an extremely thin initial mesh and then iterates the initial mesh until its rigid mapping energy to the target mesh is minimal. A positive area/volume-preserving rigid mapping method is applied iteratively to ensure robustness. This method has been partly validated in 2D and has achieved preliminary results in 3D. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Boundary layers

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Machine Learning Classification and Reduction of CAD Parts

Machine Learning Classification and Reduction of CAD Parts

引用

International Meshing Roundtable Workshop (IMR)

作者： Owen, Steven J. Carbajal, Armida J. Peterson, Matthew G. Ernst, Corey D. Sandia Natl Labs Albuquerque NM 87185 USA

ISBN: (纸本)9783031405969;9783031405945;9783031405938

We demonstrate machine learning methods to reduce bottlenecks in CAD-to-simulation workflows for critical analysis. Classification of common mechanisms such as fasteners and springs requiring common simplification and preparation procedures are first addressed. We introduce a new topology-based method for extracting features from CAD parts based on geometry queries from a third-party CAD kernel. A supervised learning classification procedure is then used to predict its categorization from a range of pre-defined categories. We demonstrate improved performance for our classification procedures over similar published work. Also demonstrated are new reduction operations to meet analysis input specifications that rapidly transform CAD parts identified as fasteners and springs into simulation-ready proxies. We also introduce a new in-situ classification tool that allows for custom categorization and easy addition of user-defined training data. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Computer aided design

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Coupe: A Mesh Partitioning Platform

Coupe: A Mesh Partitioning Platform

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International Meshing Roundtable Workshop (IMR)

作者： Chevalier, Cedric Hirtz, Hubert Ledoux, Franck Morais, Sebastien CEA DAM DIF F-91297 Arpajon France

ISBN: (纸本)9783031405969;9783031405945;9783031405938

This paper presents Coupe, a mesh partitioning platform. It provides solutions to solve different variants of the mesh partitioning problem, mainly in the context of load-balancing parallel mesh-based applications. From partitioning weights ensuring balance to topological partitioning that minimizes communication metrics through geometric methods, Coupe offers a large panel of algorithms to fit user-specific problems. Coupe exploits shared memory parallelism, is written in Rust, and consists of an open-source library and command line tools. Experimenting with different algorithms and parameters is easy. The code is available on Github: https://***/LIHPC-computational-Geometry/coupe. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Component-based programming Geometric partitioning Mesh partitioning Multi-threading

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Curvilinear Mesh Generation for the High-Order Virtual Element Method (VEM)

Curvilinear Mesh Generation for the High-Order Virtual Eleme...

引用

International Meshing Roundtable Workshop (IMR)

作者： Kirilov, Kaloyan Peiro, Joaquim Green, Mashy Moxey, David da Veiga, Lourenco Beirao Dassi, Franco Russo, Alessandro Imperial Coll London Dept Aeronaut London England Kings Coll London Dept Engn London England Univ Milano Bicocca Dept Math & Applicat Milan Italy

ISBN: (纸本)9783031405969;9783031405945;9783031405938

We present a proof-of-concept methodology for generating curvilinear polygonal meshes suitable for high-order discretizations by the Virtual Element Method (VEM). A VEM discretization requires the definition of a set of boundary and internal points that are used to interpolate the approximation functions and to evaluate integrals by means of suitable quadratures. The procedure to locate these points on the boundary borrows ideas from previous work on a posteriori high-order mesh generation in which the geometrical inquiries to a B-rep of the computational domain are performed via an interface to CAD libraries. Here we describe the steps of the procedure that transforms a straight-sided polygonal mesh, generated using third-party software, into a curvilinear boundary-conforming mesh. We discuss criteria for ensuring and verifying the validity of the mesh. Finally, using the Laplace equation with Dirichlet boundary conditions as a model problem, we show that VEM discretizations on such meshes achieve the expected rates of convergence as the mesh resolution is increased. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Mesh generation

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Refining Simplex Points for Scalable Estimation of the Lebesgue Constant

Refining Simplex Points for Scalable Estimation of the Lebes...

引用

International Meshing Roundtable Workshop (IMR)

作者： Jimenez-Ramos, Albert Gargallo-Peiro, Abel Roca, Xevi Barcelona Supercomputing Ctr Barcelona Spain

ISBN: (纸本)9783031405969;9783031405945;9783031405938

To estimate the Lebesgue constant, we propose a point refinement method on the d-dimensional simplex. The proposed method features a smooth gradation of the point resolution, neighbor queries based on neighbor-aware coordinates, and a point refinement that algebraically scales as d+1d. Remarkably, by using neighbor-aware coordinates, the point refinement method is ready to automatically stop using a Lipschitz criterion. For different polynomial degrees and point distributions, we show that our automatic method efficiently reproduces the literature estimations for the triangle and the tetrahedron. Moreover, we efficiently estimate the Lebesgue constant in higher dimensions. Accordingly, up to six dimensions, we conclude that the point refinement method is well-suited to efficiently estimate the Lebesgue constant on simplices. In perspective, for a given polynomial degree, the proposed point refinement method might be relevant to optimize a set of simplex points that guarantees a small interpolation error. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

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Towards a Volume Mesh Generator Tailored for NEFEM

Towards a Volume Mesh Generator Tailored for NEFEM

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International Meshing Roundtable Workshop (IMR)

作者： Zou, Xi Lo, Sui Bun Sevilla, Ruben Hassan, Oubay Morgan, Kenneth Swansea Univ Zienkiewicz Inst Modelling Data & AI Fac Sci & Engn Swansea SA1 8EN W Glam Wales

ISBN: (纸本)9783031405969;9783031405945;9783031405938

The conversion of digital models from computer-aided design (CAD) to meshes for computer-aided engineering (CAE) is a well-known bottleneck, because of the amount of human intervention required in the cumbersome de-featuring process. This paper introduces the strategy to address this issue by generating the geometric-persistent volume mesh tailored for the NURBS-enhanced finite element method (NEFEM). The NEFEM has been developed to decouple the geometry representation and the numerical approximation to address this issue. NEFEM uses CAD data, the non-uniform rational B-spline (NURBS) that describe the boundary representation (B-rep), to describe the geometry of the computational domain, and it adopts polynomial shape functions for the numerical approximation of the unknown solution. The need for de-featuring is avoided by NEFEM, and the geometric error is completely removed. As a dedicated NEFEM mesh generator is crucial for problems involving complex geometries, this paper introduces the strategy devised to generate volume meshes tailored for NEFEM solvers. The proposed approach is based on previously developed NEFEM surface mesh generation method, and new requirements for validity checks are imposed for the volume mesh generation. A layer of NEFEM volume elements is firstly created, followed by the interior volume mesh which can be obtained from a standard mesh generator. The resulting mesh maintains the exact geometric B-rep, and the element sizes are fully dominated by the user-defined spacing and not by the presence of small geometric features. Examples are presented for an illustrative demonstration of the proposed technique. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Computer aided design

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A Method for Adaptive Anisotropic Refinement and Coarsening of Prismatic Polyhedra

A Method for Adaptive Anisotropic Refinement and Coarsening ...

引用

International Meshing Roundtable Workshop (IMR)

作者： Menon, Sandeep Gessner, Thomas Ansys Inc Chicago IL 60201 USA Ansys Inc Lebanon NH USA

ISBN: (纸本)9783031405969;9783031405945;9783031405938

A method is proposed to enable the anisotropic refinement and coarsening of prismatic boundary-layer polyhedra within the context of unstructured polyhedral meshes for viscous flow simulations using computational fluid dynamics. The method is compatible with the Polyhedral Unstructured Mesh Adaptation (PUMA) algorithm for the isotropic refinement and subsequent coarsening of general polyhedral cells. This allows simulations to leverage the full flexibility of polyhedral meshes for adaptive mesh refinement, while retaining the benefits of an improved accuracy-to-computational cost ratio. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Coarsening

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Quadrilateral Mesh of Non-simply Connected Domain and Non-planar Surfaces From a Given Cross-Field

Quadrilateral Mesh of Non-simply Connected Domain and Non-pl...

引用

International Meshing Roundtable Workshop (IMR)

作者： Dotse, Kokou M. Mouysset, Vincent Pernet, Sebastien Off Natl Etud & Rech Aerosp 2 Ave Edouard Belin F-31000 Toulouse France

ISBN: (纸本)9783031405969;9783031405945;9783031405938

In this paper, we present a method for constructing a quad mesh from an initial cross-field given by the user. The idea of this approach is to provide a framework to process any cross-field in order to generate a quad mesh and thus benefit from the properties of the field in the resulting mesh. With this point of view, we handle the case of non-simply connected domains and we also address the notion of singular point placement on the edge, which allows us to handle geometries of arbitrary index. Finally, we give an extension of the method to non-planar surface manifolds. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Mesh generation

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Tetrahedralization of Hexahedral Mesh

Tetrahedralization of Hexahedral Mesh

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International Meshing Roundtable Workshop (IMR)

作者： Timalsina, Aman Knepley, Matthew Purdue Univ W Lafayette IN 47907 USA Univ Buffalo Buffalo NY USA

ISBN: (纸本)9783031405969;9783031405945;9783031405938

Two important classes of three-dimensional elements in computational meshes are hexahedra and tetrahedra. While several efficient methods exist that convert a hexahedral element to tetrahedral elements, the existing algorithms for tetrahedralization of a hexahedral complex limit pre-selection of face divisions. We generalize a procedure for tetrahedralizing triangular prisms to tetrahedralizing cubes, and combine it with certain other triangulation techniques to design an algorithm that can triangulate any hexahedra. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

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