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Structural quadrilateral grid generation-oriented automatic two-dimensional region decomposition method

A grid generation and domain decomposition technology, applied in design optimization/simulation, constraint-based CAD, image data processing, etc., can solve the problems of increasing errors, time-consuming, and restricting automatic block structured grid generation tools, etc. Achieve the effect of enhancing accuracy and speed and improving generation efficiency

Active Publication Date: 2018-10-30
HANGZHOU DIANZI UNIV
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Problems solved by technology

On the one hand, the introduction of manual links requires engineers to have strong engineering experience, on the other hand, it is very time-consuming and increases the possibility of errors
These shortcomings restrict the birth of automatic block structured grid generation tools

Method used

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  • Structural quadrilateral grid generation-oriented automatic two-dimensional region decomposition method
  • Structural quadrilateral grid generation-oriented automatic two-dimensional region decomposition method
  • Structural quadrilateral grid generation-oriented automatic two-dimensional region decomposition method

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Embodiment

[0070] Figure 4 It is the two-dimensional aircraft wing shape (including the main wing in the middle and the flaps at both ends, a total of three sections of the wing structure) and its outer flow field calculation domain, Figure 5 The automatic domain decomposition results of a certain two-dimensional airfoil calculation domain using the present invention are shown. The present invention can automatically realize the automatic decomposition of the calculation domain, and obtain multi-block high-quality four-sided structure sub-domains, thereby improving the block structured grid (such as Figure 6 a, 6b, and 6c) Generation efficiency and block structured grid quality.

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Abstract

The invention discloses a structural quadrilateral grid generation-oriented automatic two-dimensional region decomposition method. At present, the structural grid generation aiming at complex geometric appearances mainly depends on sub-regions which artificially and manually decompose complex regions into rules, so that the error possibility is increased. The method comprises the following steps of: establishing a two-dimensional geometric model for analyzing entity objects and discretizing the two-dimensional geometric model into a triangular grid model; establishing a control partial differential equation for a smooth vector field in the internal region of the two-dimensional geometric model according to geometric boundary constraint, and solving the equation by adoption of a boundary element numerical method; and establishing a smooth frame field corresponding to the smooth vector field, and automatically decomposing the two-dimensional geometric model through analyzing a singular structure of the smooth frame field. The method is capable of automatically and rapidly obtaining high-quality partition results of any complex two-dimensional geometric models so as to provide inputsfor the subsequent multi-block structural quadrilateral grid generation.

Description

technical field [0001] The invention relates to an area decomposition process for generating block structured quadrilateral grids in preprocessing in the field of numerical simulation, in particular to a two-dimensional area automatic decomposition method for structured quadrilateral grid generation. Background technique [0002] Mesh generation is a preprocessing process in numerical simulation techniques such as finite element method, finite volume method, and finite difference method. This process divides a continuous geometric area into a combination of finite basic geometric shapes. These basic geometric shapes are called grids. cell. The commonly used unit types are triangular unit, quadrilateral unit, tetrahedral unit and hexahedral unit, etc.; according to whether the topological structure of the grid unit is regular, the grid can be divided into structured grid and unstructured grid. In numerical simulation, structured grids are favored due to their higher solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06T17/10
CPCG06T17/10G06F2111/04G06F30/20
Inventor 徐岗何寿平肖周芳许金兰吴卿
Owner HANGZHOU DIANZI UNIV
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