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Fragmentation parameterization-based feature-preserving surface structure grid generation method

A grid generation and structured surface technology, which is applied in image data processing, 3D modeling, instruments, etc., can solve the problems of low quadrilateral patch, quadrilateral grid with multiple singular points, and maintain characteristic information, so as to achieve less singular points Effect

Pending Publication Date: 2022-04-12
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0004] The current structured quadrilateral mesh generation technology cannot preserve feature information well, and the generated quadrilateral mesh often has more singular points and lower-quality quadrilateral patches

Method used

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  • Fragmentation parameterization-based feature-preserving surface structure grid generation method
  • Fragmentation parameterization-based feature-preserving surface structure grid generation method
  • Fragmentation parameterization-based feature-preserving surface structure grid generation method

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Embodiment Construction

[0065] The technical solutions of the present invention will be further specifically described below through specific embodiments and in conjunction with the accompanying drawings.

[0066] Step 1. Establish a three-dimensional triangular mesh model M for analyzing solid objects t (Such as figure 1 , this figure is a 3D triangular mesh model, in the subsequent steps, the 3D triangular mesh model will be transformed into a 3D quadrilateral mesh model), and the feature line set CL to be preserved is manually extracted by CAD software ( Such as figure 2 , this picture is the 3D feature information that you want to keep, and the 3D quadrilateral mesh model generated by the method in this paper can still keep these features). Through this step, the feature information that the user wants to keep can be obtained;

[0067] Step 2. Use the feature line set CL to decompose the 3D triangular mesh model M through the flooding strategy t (Such as image 3 , this figure shows 15 3D t...

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Abstract

The invention discloses a feature-preserving structured surface quadrilateral mesh generation method. At present, according to a generation method for a structured quadrilateral grid, the quality of the generated grid is poor, the characteristics cannot be effectively kept, and the requirement of simulation calculation is difficult to meet. The method comprises the following steps: extracting a feature line; a flooding decomposition model; the method comprises the following steps of: carrying out boundary first flashing parameterization; carrying out topological division based on a pricing field; solving a mapping relation between the two-dimensional triangular mesh surface patches and the three-dimensional triangular mesh surface patches; mapping the two-dimensional streamline to three dimensions to generate a three-dimensional streamline; solving a streamline discrete segment number through integer programming; generating a two-dimensional quadrilateral mesh patch through bilinear interpolation; mapping the two-dimensional quadrilateral mesh to three dimensions through a mapping relation between two dimensions and three dimensions to generate a three-dimensional quadrilateral mesh patch; and splicing the three-dimensional quadrilateral mesh patches to generate a structured quadrilateral mesh model. According to the method, the feature-preserving high-quality structured quadrilateral mesh model can be quickly generated.

Description

technical field [0001] The invention relates to the generation process of the structured quadrilateral grid in the pre-processing in the field of numerical simulation, in particular to a generation method of the feature-preserving surface structure grid based on slice parameterization. Background technique [0002] Mesh generation is a preprocessing process in numerical simulation techniques such as finite element method, finite volume method, and finite difference method. This process is to convert a mesh model composed of structured triangular elements into a mesh model composed of structured quadrilateral elements. In numerical simulation, quadrilateral grids are favored because of their higher solution accuracy, computational efficiency and ease of transformation than triangular grids. [0003] Mesh parameterization was originally a method widely used in surface mapping of models. Its main function is to map a 3D model to a 2D area, and it acts as a bridge between 2D and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20G06T17/10G06T19/20
Inventor 徐岗蒋鹏苏立彪肖周芳吴海燕
Owner HANGZHOU DIANZI UNIV
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