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Rapid generation method of hybrid grid

A hybrid grid and grid generation technology, applied in image data processing, 3D modeling, instruments, etc., can solve problems such as cube unit torsion, grid quality degradation, skew, etc., to reduce time ratio and generate efficiency High, good algorithm stability

Active Publication Date: 2015-06-24
CHINA ACAD OF AEROSPACE AERODYNAMICS
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  • Claims
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Problems solved by technology

However, the fairing process will cause the nearby cube elements to twist, stretch, and deflect, resulting in a decrease in mesh quality.

Method used

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Embodiment Construction

[0031] The present invention will be further described below.

[0032] For the convenience of the following description, a simple cube unit is taken as an example to introduce the grid node numbering rules adopted in this method. Each cubic unit has eight vertices, such as figure 1 Middle A-H. For some units, in addition to the eight vertices, there may be suspended nodes at the midpoint of each side and the face center of each face, and some units also have grid nodes at the body center. Therefore, for any unit, the number of nodes that may exist inside the unit is at most 27 (8 vertices + 12 edge midpoints + 6 face centers + 1 body center), figure 1 The black dots in the middle are 27 possible node positions, which are called 27 node positions here.

[0033] In the following introduction, the hexagram limit is also needed. The definition method of the hexagram limit used here is: in the Cartesian coordinate system, the hexagram limit including the positive semi-axis of X,...

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Abstract

The invention discloses a rapid generation method of a hybrid grid. The method includes the steps of 1, performing processing before grid generation; 2, generating an octree Cartesian grid; 3, segmenting the octree Cartesian grid with a standard segmenting template to generate a hybrid grid; 4, calculating grid information of the hybrid grid and outputting the grid information. The problem of quickly generating the hybrid grid in computational fluid mechanics is solved; by means of standard temperature based segmenting, the hybrid grid can be automatically generated with no manual intervention or solving algebraic equations or differential equations.

Description

technical field [0001] The invention relates to a fast hybrid grid generation method. Background technique [0002] Computational fluid dynamics (CFD) is an important means in the research method of modern fluid mechanics, and grid generation technology is the key link in CFD. It is generally believed that in computational fluid dynamics research, the pre-processing work accounts for more than 70% of the total workload, and the main work of the pre-processing is the division of computational grids. Obviously, the development of efficient mesh generation methods can greatly improve the efficiency of CFD research. [0003] According to the grid type, the calculation grids generally used in CFD research can be divided into structured grids and unstructured grids. Structural grid nodes change in an orderly manner, and the solution efficiency and accuracy are high, but it is more cumbersome when dealing with complex shapes; the formation of unstructured grid nodes and elements ...

Claims

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Application Information

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IPC IPC(8): G06T17/30
CPCG06T17/005G06T17/30G06T2200/04
Inventor 何跃龙李盾刘帅
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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