Iteration generation method of hexahedral mesh model

A technology of grid model and hexahedron, which is applied in the field of iterative generation of hexahedral grid model, can solve problems such as poor quality grid units and distortion of hexahedral grid model, achieve less manual interaction, improve fitting accuracy, and high degree of automation Effect

Inactive Publication Date: 2014-05-28
ZHEJIANG UNIV
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Problems solved by technology

If the model has a branch that is very different from the direction of the PolyCube body, it will cause the mapped hexahedral mesh model to be greatly distorted and poor quality mesh cells will appear.

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  • Iteration generation method of hexahedral mesh model
  • Iteration generation method of hexahedral mesh model
  • Iteration generation method of hexahedral mesh model

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specific Embodiment approach

[0057] The present invention will now be described in detail in conjunction with the embodiments and the accompanying drawings. The specific implementation is as follows:

[0058] Step 1: Input a triangular mesh model, construct an initial hexahedral mesh model based on the triangular mesh model, and extract a surface quadrilateral mesh on the initial hexahedral mesh model.

[0059] For the input triangular mesh model M d (Such as Figure 2a shown), first construct a cube to enclose it. Then, this cube is evenly divided into voxels (i.e. uniformly discretized), resulting in Figure 2b As shown in the model, it can be seen that the model is composed of voxels. In this model, voxels have side lengths that are half the average side length of the triangle mesh. Among them, the obtained model is related to M d The intersecting voxels are called feature voxels, in M d The internal voxels are called internal voxels, and in M d Voxels outside are called external voxels. In ad...

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Abstract

The invention discloses an iteration generation method of a hexahedral mesh model. The iteration generation method comprises the following steps: step one, inputting a triangular mesh model, constructing an initial hexahedral mesh model according to the triangular mesh model, and extracting a surface quadrilateral mesh from the initial hexahedral mesh model; step 2, carrying out iterative fitting of the surface quadrilateral mesh of the initial hexahedral mesh model on the triangular mesh model and carrying out mobile diffusion on mesh peaks of the surface quadrilateral mesh so as to obtain an intermediate hexahedral mesh model that is divided into multiple layers of quadrilateral meshes; and step three, inserting a layer of quadrilateral mesh between the surface quadrilateral mesh of the intermediate hexahedral mesh model and the internal first-layer quadrilateral mesh and optimizing all layers of the quadrilateral meshes except the surface quadrilateral mesh so as to obtain a final hexahedral mesh model. According to the invention, with the method, a hexahedral mesh with the guaranteed quality can be obtained; and the automation degree is improved.

Description

technical field [0001] The invention relates to the technical field of geometric modeling, in particular to an iterative generation method of a hexahedron grid model. Background technique [0002] Given a triangular mesh model, it is necessary to generate a hexahedral mesh model to fill the triangular mesh model. This problem occupies a very important position in finite element analysis. In order to solve this problem, it is usually necessary to divide the model into several sub-blocks with simple shapes, and use the scanning method or mapping method to generate a hexahedral mesh model for each sub-block, and then splicing each sub-block together to obtain the final hexahedron grid model. Many scholars have studied this problem deeply and proposed many methods. These methods can be roughly divided into three categories: direct method, indirect method and structured method. [0003] The direct method first fills the hexahedral grid elements at the boundary of the model, a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20
Inventor 蔺宏伟
Owner ZHEJIANG UNIV
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