Method for correcting intersecting line of unstructured Cartesian grid

A technology of right-angle grids and intersecting lines, applied in image data processing, 3D image processing, instruments, etc., can solve problems such as object plane distortion, achieve the effects of avoiding intersections, improving projection efficiency, and high grid quality

Active Publication Date: 2013-02-13
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

[0007] The technical problem of the present invention is: aiming at the deficiencies of the prior art, a method for correcting intersecting lines of non-structural right-angle grids is provided, which solves the problems that may occur when calculating grid generation in computational fluid dynamics due to smoothness, Distortion of the object surface caused by projection and other steps, and the method of reverse projection correction of intersecting lines can ensure that the final generated calculation mesh surface is close to the original object shape

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  • Method for correcting intersecting line of unstructured Cartesian grid
  • Method for correcting intersecting line of unstructured Cartesian grid
  • Method for correcting intersecting line of unstructured Cartesian grid

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Embodiment Construction

[0038] The following will combine the generation process of the unstructured rectangular grid with the cylindrical shape and Figure 5 The flow diagram shown further describes the invention. The process of generating an unstructured rectangular grid mainly includes the following parts:

[0039] Step 1: Describe the shape of the object to generate a background grid

[0040] First of all, it is necessary to provide the background grid of the object shape, that is, to express the original object shape as a collection of many small background mesh surfaces, such as Figure 4a This is the schematic diagram of the background mesh of the cylindrical shape. The background grid can be triangular, quadrilateral or other arbitrary polygons. This grid is only the shape input file, which tells the program the shape of the object to be described.

[0041] Step 2: Set Mesh Generation Parameters

[0042] According to the requirements of numerical calculation, input the parameters of grid ge...

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Abstract

The invention discloses a method for correcting an intersecting line of an unstructured Cartesian grid. The method comprises the following steps of: describing the shape of an object to generate a background grid; setting grid generation parameters; generating an n-ary tree structure according to the background grid and the set parameters; deleting units within the shape of the object and units intersected with the shape of the object to generate a saw-toothed inner surface; fairing the saw-toothed inner surface to obtain a faired inner surface; performing intersecting line correction and projection on the faired inner surface; and calculating a grid flux, and outputting grid information. The problem of object surface distortion possibly caused by the steps of fairing, projection and the like when the grid is generated in computational fluid mechanics is solved, and a finally generated computational grid object surface can be ensured to be approximate to an original object shape in an intersecting line inverse projection and correction way.

Description

technical field [0001] The invention relates to a method for correcting intersecting lines of non-structural right-angle grids. 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. According to the grid type, computing grid can be divided into structured grid and unstructured grid. Structural grid nodes change in an orderly manner, and the solution efficiency and accuracy are high, but it is cumbersome when dealing with complex shapes; the formation of unstructured grid nodes and elements is random, and it is more flexible when processing shapes, and is more suitable for complex shapes. Grids belong to the category of unstructured grids. [0003] The generation of the unstructured right-angle grid adopts the method of fork tree structure, figure 1 As shown, the unit is divided into eight by the way of octree, so as to realize the encry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/00
Inventor 何跃龙
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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