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Prismatic grid generation method with realization of interactive operation

A grid generation and interactive operation technology, applied in image data processing, 3D modeling, instruments, etc., can solve problems such as grid failure and low grid quality

Inactive Publication Date: 2014-02-05
AERODYNAMICS NAT KEY LAB
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the advancing normal vector of the complex shape surface is difficult to control in the normal advancing method, it is easy to cause the crossing of the advancing direction and the mesh volume is negative, which leads to the failure of mesh generation, the pre-generated background structure mesh frame is used to control the surface mesh Propel direction, to ensure that the node propulsion direction does not intersect during the generation of the prism grid, and the grid does not have a negative volume, ensuring the success of the prism grid generation;
[0009] Aiming at the problem that the single-layer grid unit generated by the forwarding is not smooth due to the change of the forward step size in the normal push method, and the grid quality is low, the background structure grid frame is used to control the shape of the single-layer grid unit to ensure that the generated prism network grid with high mesh quality

Method used

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  • Prismatic grid generation method with realization of interactive operation
  • Prismatic grid generation method with realization of interactive operation
  • Prismatic grid generation method with realization of interactive operation

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Embodiment Construction

[0041] All features disclosed in this specification, or steps in all methods or processes disclosed, can be combined in any way, except for mutually exclusive features or steps.

[0042] Such as figure 1 According to the geometric shape feature of object surface 1, in the parallel (I, J direction in the figure) and vertical direction (K direction in the figure) close to the object plane, draw and generate background structure grid frame control line 2, I, J direction The background structure grid frame control line constrains the growth range of the prism grid, the background structure grid frame control line in the K direction constrains the growth direction of the prism grid, and the area surrounded by the background structure grid frame control line 2 constitutes the generation of the prism grid Area: Arrange an appropriate number of frame control line nodes 3 on the frame control line 2 of the background structure grid in the I and J directions, and the number of frame con...

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Abstract

The invention discloses a prismatic grid generation method with the realization of an interactive operation. A bold background structure grid frame is generated by using a transfinite interpolation technique, then a mapping relation is established between an object surface grid node and the background structure grid frame, through adjusting the background structure grid frame, the growth area, the growth direction and the growth speed of a prismatic grid are controlled, and the rapid and efficient generation of the prismatic grid is realized according to artificial interaction. Through the implementation of the method, the growth directions of the prismatic grid do not cross, the success growth of the prismatic grid is ensured, the background structure grid frame is modified through the artificial interaction, the local control and adjustment of the prismatic grid are realized, and the quality of the generation of the prismatic grid is improved.

Description

technical field [0001] The invention relates to the field of grid generation in computational mechanics, in particular to the grid generation of external flow fields in computational fluid dynamics and a prism grid generation method capable of realizing interactive operations. Background technique [0002] A high-quality discrete grid is the basis for obtaining accurate CFD (Computational Fluid Dynamics, CFD) calculation results. At present, although some efficient commercial grid division software has appeared, grid generation still accounts for about 60% of the CFD workload. Efficient and high-quality meshing is still one of the key research issues facing CFD applications. [0003] Triangular or tetrahedral meshes can automatically fill any two-dimensional or three-dimensional area, and realize the fully automatic generation of meshes with arbitrary complex shapes. However, triangular or tetrahedral meshes are incapable of simulating high Reynolds number boundary layer flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/30
Inventor 孙岩邓小刚王运涛毛枚良张来平王光学刘化勇常兴华涂国华
Owner AERODYNAMICS NAT KEY LAB
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