Automatic Generation Method of Symmetric Mesh for Integral Impeller Cycle

Abstract

The invention discloses a cyclic symmetric mesh automatic generation method for a whole impeller. The method is used for performing finite element hexahedral three-dimensional entity unit mesh generation on a cyclic symmetric section of the whole impeller. The whole impeller comprises blades and an impeller disk. The cyclic symmetric mesh automatic generation method for the whole impeller comprises the steps of generating blade hexahedral finite element meshes of the blades; generating ruled surfaces of the blades according to the blade hexahedral finite element meshes; building an impeller disk two-dimensional geometric model of the impeller disk, and generating impeller disk two-dimensional finite element meshes according to the built impeller disk two-dimensional geometric model; mapping the impeller disk two-dimensional finite element meshes to the ruled surfaces to form ruled surface two-dimensional meshes; and generating 20 node hexahedral units of the whole impeller according to the ruled surface two-dimensional meshes. According to the method, the automation from geometric modeling to a mesh automatic generation process is realized, and the precision and the efficiency are high, so that the method is easily applied to the finite element structure optimization design.

Description

technical field [0001] The invention relates to the field of finite element mesh generation, in particular to a method for automatically generating a symmetrical mesh of an integral impeller cycle. Background technique [0002] When performing impeller finite element structural analysis, it is necessary to divide the finite element grid of the impeller. In the prior art, only four-node or ten-node tetrahedral grids (such as figure 1 shown), the steps of generating tetrahedral elements include: ①, generating the solid shape of the overall impeller; ②, intercepting the circular symmetric segment of the solid shape of the overall impeller; ③, meshing the cyclic symmetric segment Grid division. Therefore, the tetrahedron elements generated in the prior art have low precision, many steps, heavy workload, and low efficiency. It is difficult to automate the process from geometric modeling to mesh automatic generation, so it is difficult to apply in optimal design. Therefore, in o...

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Problems solved by technology

[0004] The present invention provides a method for automatically generating a cyclic symmetric mesh of an integral impeller to solve the technical problem in the prior art that the finite element hexahedral three-dimensional solid unit mesh of the cyclic symmetric section of the integral impeller cannot be generated

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