• Title/Summary/Keyword: Advancing front method

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Adaptive Mesh Generation in Large Deformation Analysis of Shell Structures with Advancing Front Method (Advancing Front Method를 이용한 대변형 쉘 구조물의 적응적 유한요소 자동생성법)

  • 장창두;정진우;문성춘
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.12 no.3
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    • pp.447-455
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    • 1999
  • An adaptive mesh generation scheme is developed for effective non-linear analysis of the shell structures under large deformation. In particular, based on a posteriori error estimation, remeshing method on each load step is of primary interest here. An advancing front method, called paving method, is adopted for remeshing. It can be known that the adaptive mesh generation using contours of spacing values obtained from stress errors has an advantage in the adaptive analysis of the shell structures.

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Tetrahedral Mesh Generation Using a Mixed Method of a Grid and an Advancing Front Approach (격자법과 전진경계법을 흔합한 사면체 요소망의 자동생성)

  • 김영웅;전성재;채수원
    • Korean Journal of Computational Design and Engineering
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    • v.8 no.1
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    • pp.41-47
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    • 2003
  • In this paper, a tetrahedral mesh generation algorithm which uses a grid based method for interior region and an advancing front method for outer surface region is proposed. In order to apply an advancing front method for outer region of an object, a new operator so called a hole operator has been developed to handle multiple shells. With this grid based approach in the interior region, more stable and uniform meshes can be constructed especially in the interior region.

Tetrahedral Mesh Generation by Using the Advancing-Front Method and the Optimal Surface Triangular Mesh Generation Technique (전진경계기법과 최적 표면 삼각형 요소망 생성 기법을 이용한 사면체 요소망의 생성)

  • Lee M.C.;Joun M.S.
    • Korean Journal of Computational Design and Engineering
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    • v.11 no.2
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    • pp.138-147
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    • 2006
  • A systematic approach to tetrahedral element or mesh generation, based on an advancing-front method and an optimal triangular mesh generation technique on the surface, is presented in this paper. The possible internal nodes are obtained by the octree-decomposition scheme. The initial tetrahedral mesh system is constructed by the advancing-front method and then it is improved by the quality improvement processes including mesh swapping and nodal smoothing. The approach is evaluated by investigating the normalized length, the normalized volume, the dihedral angle and the normalized quality

Unstructured Tetrahedral Meshing by an Edge-Based Advancing Front Method

  • Kim, Young-Woong;Kwon, Gi-Whan;Chae, Soo-Won;Shim, Jae-Kyung
    • Journal of Mechanical Science and Technology
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    • v.16 no.2
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    • pp.211-218
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    • 2002
  • This paper proposes an unstructured tetrahedral meshing algorithm for CAD models in the IGES format. The work presented is based on the advancing front method, which was proposed by the third author. Originally, the advancing front method uses three basic operators, namely, trimming, wedging, and digging. In this research, in addition to the basic operators, three new operators splitting, local finishing, and octahedral-are added to stabilize the meshing process. In addition, improved check processes are applied to obtain better-shaped elements. The algorithm is demonstrated and evaluated by four examples.

Unstructured Quadrilateral Surface Grid Generation and Cell Size Control

  • Kim, Byoung-Soo
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03a
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    • pp.386-389
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    • 2008
  • In this paper grid generation of unstructured quadrilateral surface grids is described. The current approach uses conventional Advancing Front Method which is used to generate unstructured triangular grids. Grid cell size control is done by using closeness-based global interpolation method controlled by pre-described control elements. Algorithm and procedure for quadrilateral grid generation using AFM method and cell size control method are described. Examples of quadrilateral grid generation are shown, and difficulties and problems related to the current approach are also discussed.

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Unstructured Quadrilateral Surface Grid Generation and Cell Size Control

  • Kim, Byoung-Soo
    • 한국전산유체공학회:학술대회논문집
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    • 2008.10a
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    • pp.386-389
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    • 2008
  • In this paper grid generation of unstructured quadrilateral surface grids is described. The current approach uses conventional Advancing Front Method which is used to generate unstructured triangular grids. Grid cell size control is done by using closeness-based global interpolation method controlled by pre-described control elements. Algorithm and procedure for quadrilateral grid generation using AFM method and cell size control method are described. Examples of quadrilateral grid generation are shown, and difficulties and problems related to the current approach are also discussed.

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A Grid Generation Technique for the External Flow Fields Utilizing the Predictor-Corrector Scheme (Predictor-Corrector를 활용한 외부 유동장 격자 생성 기법)

  • Kim B. S.
    • Journal of computational fluids engineering
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    • v.2 no.1
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    • pp.84-92
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    • 1997
  • In this paper a new structured grid generation technique is introduced. This new technique utilizes predictor-corrector approach, and is a marching scheme in the global sense as the hyperbolic scheme is. In the predictor step, one layer of grid cells is obtained by using Modified Advancing Front Method which generates a collection of quadrilateral cells simultaneously. In the corrector step, the layer of grid cells that is calculated in the predictor step is adjusted by solving Laplace equations to prevent grid lines from skewing and overlapping in highly curved configurations. It is shown that the resultant algorithm, named a MAP scheme, which combines the Modified Advancing Front Method as a Predictor with an elliptic scheme as a corrector can be used to generate globally smooth and locally near-orthogonal grids for external flow fields even for highly curved configurations. Examples of grid generations for external flow fields about several configurations by use of the present approach are given, and its applicability and flexibility have been demonstrated and discussed.

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Automatic Tetrahedral Mesh Generation using Advancing Front Technique with Delaunay Node Searching (전진경계법에서 Delaunay 탐색조건을 이용한 사면체 요소망의 자동 생성)

  • 전성재;채수원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1605-1608
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    • 2003
  • A unstructured tetrahedral mesh generation algorithm has been presented. To make better meshes in interior region using an advancing front technique, a connecting operator has been developed in addition to the existing operators. Before applying digging operators that generate new nodes inside of a meshing region, a connecting operator is employed that uses existing nodes which satisfy certain conditions for producing well-conditioned elements if possible. By introducing this new operator, tetrahedral meshing process becomes more robust and produces better quality of meshes.

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Automatic Tetrahedral Mesh Generation Using Advancing Front Technique with Node Searching (절점 탐색이 적용된 전진경계법에 의한 사면체 요소망의 자동생성)

  • 전성재;채수원
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.3
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    • pp.91-99
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    • 2004
  • An unstructured tetrahedral mesh generation algorithm has been presented. In order to construct better meshes in interior region by using an advancing front technique, a connecting operator and a local finishing operator II have been developed in addition to the existing operators. Before applying digging operators that generate new nodes inside of a meshing region, a connecting operator is employed that uses existing nodes which satisfy certain conditions for producing well-conditioned elements. The local finishing operator II is introduced to terminate the meshing process more flexibly on remaining subregions. With these new operators, tetrahedral meshing process becomes more robust and good quality of meshes are constructed.

A New Indirct Quadrilateral Mesh Generation Scheme from Background Triangular Mesh (삼각형 배경 요소를 이용한 새로운 사각형 요소망 생성법)

  • Kwon K.Y.;Park J.M.;Lee B.C.;Chae S.W.
    • Korean Journal of Computational Design and Engineering
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    • v.11 no.2
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    • pp.107-114
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    • 2006
  • A new quadrilateral mesh generation technique from an existing triangle mesh is proposed in this paper. The proposed method is based on advancing front method and zero-thickness layer. Beginning with an initial triangular mesh, boundary triangular elements are removed and quadrilateral elements with zero thickness are generated. A quality of quadrilateral elements is improved during a mesh smoothing process. Until all initial triangular elements are removed, this procedure is repeated. Sample meshes are constructed to demonstrate the mesh generation capability of proposed algorithm.