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Grid boundary condition processing method of unstructured grid CFD computation

An unstructured grid and boundary condition technology, applied in computing, electrical digital data processing, special data processing applications, etc., can solve problems such as time-consuming, and achieve obvious effects and reduce grid data processing time.

Active Publication Date: 2016-06-01
BEIJING LINJIN SPACE AIRCRAFT SYST ENG INST +1
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Problems solved by technology

[0005] Traditionally, the exhaustive method is used to compare the distances from the boundary grid nodes to the inner field grid nodes one by one, and find out that the distance is less than a certain threshold (generally 10 -7 ) is the coincidence point of the boundary point, so the properties of the boundary grid are assigned to the volume grid that coincides with it, which brings a large amount of calculation, and with the volume grid and The number of boundary grids increases exponentially, which takes a lot of computer time

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  • Grid boundary condition processing method of unstructured grid CFD computation
  • Grid boundary condition processing method of unstructured grid CFD computation

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Embodiment Construction

[0033] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] A grid boundary condition processing method for unstructured grid CFD calculation of the present invention comprises the following steps:

[0035] (1) Establish grid information

[0036] The applicable object of the present invention is the unstructured grid of Tecplot format, and complete unstructured grid comprises grid data and boundary conditions; Grid data records the coordinates of each grid point and the member number of body grid node, and boundary conditions mark boundary the boundary type of the grid;

[0037] After the grid generation software generates the unstructured grid, specify the boundary condition type of the boundary grid;

[0038] (2) Define the boundary type

[0039] The outer neighbor unit numbers of each surface of the volume grid in the inner field are positive integers, and the b...

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Abstract

The invention belongs to the technical field of grid computation, and specifically relates to a grid boundary condition processing method of unstructured grid CFD computation. The method comprises the following steps: establishing grid information; defining a boundary type; extracting grid outer boundary information; realizing the matching of a first node through a method of exhaustion; matching the remaining nodes in a wave front form; matching a boundary surface unit; and assigning a boundary condition. According to the method, a method for rapidly matching between unstructured boundary surfaces and grid surfaces is utilized, so that the grid boundary conditions of unstructured grids in Tecplot form can be rapidly mapped to corresponding boundary surfaces of infield body grids, the rapid processing of boundary condition information of the unstructured grids can be realized and the computer time can be effectively decreased.

Description

technical field [0001] The invention belongs to the technical field of grid computing, and in particular relates to a grid boundary condition processing method for unstructured grid CFD calculation in Tecplot software format. Background technique [0002] Unstructured grids not only have good adaptability to complex shapes, but also have high spatial grid division efficiency, and are more and more favored by CFD workers. In recent years, unstructured grid CFD computing technology has developed rapidly. Since Tecplot software almost has the data interface of various commercial grid division software, various self-developed unstructured grid CFD calculation programs or software generally use grid data in Tecplot format for calculation. [0003] The unstructured grid is not as regular and orderly as the structured grid, and the nodes and units do not have simple index relationships, so it is not suitable for direct calculation of CFD. Therefore, for the Tecplot format unstruct...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 禹彩辉闵昌万龚春叶张星方洪郭灵犀
Owner BEIJING LINJIN SPACE AIRCRAFT SYST ENG INST
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