Method for repairing object plane projection error in multi-block structure grid generation

Abstract

The invention discloses a method for repairing projection errors in multi-block structure grid object plane generation. The method comprises the following steps: firstly, screening and marking an object plane grid region with a projection error through surface grid detection, then reconstructing an object plane grid with a projection error by utilizing a two-dimensional extreme interpolation method, then initializing a whole grid block by utilizing a three-dimensional extreme interpolation method, and finally generating a flow field calculation grid meeting a CFD analysis requirement. Different from the technology of repairing a digital model in commercial software to improve the projection precision and avoid generation of grid projection errors, the method provided by the invention is simple; according to the method, a plurality of structural grids with projection errors are repaired, the influence of the projection errors on the quality of the grids is eliminated through technologies such as projection error region detection and initialization reconstruction, and the automation of a repair process can be realized through a program.

Description

Technical field [0001] The invention relates to the field of grid generation of numerical calculations, in particular to the field of multi-block structure grid generation in Computational Fluid Dynamics (Computational Fluid Dynamics), and in particular to a method for repairing object plane projection errors in grid generation. Background technique [0002] With the rapid development of computer hardware equipment and calculation methods, Computational Fluid Dynamics (CFD) is playing an increasingly important role in various fields of the national economy. Especially for the development of the aerospace industry, CFD technology provides a large amount of high-quality simulation data for the design and finalization of aircraft. [0003] CFD uses grids to spatially discretize the flow field of the research object, and then solves it to obtain a discrete numerical solution of the flow field. The accuracy and reliability of the CFD analysis results are directly related to the quality...

AI Technical Summary

Problems solved by technology

[0010] First of all, aiming at the reduction of grid quality and the distortion of grid units caused by the wrong projection of the object plane grid, the object plane grid area with the wrong projection is separated through the surface grid detection, and then the over-limit interpolation is used to analyze the area of ​​the object plane grid. The grid is initialized and reconstructed, which avoids the problem of fine repairing the digital model of the object surface, and can greatly reduce the workload of generating multi-block structured grids;

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