A method for generating prism grids with interactive operation

Abstract

The invention discloses a method for generating a prism grid capable of realizing interactive operation, which uses an overlimit interpolation technique to generate a coarse background structure grid frame, and then establishes a mapping relationship between object plane grid nodes and the background structure grid frame, By adjusting the background structural grid frame to control the growth area, growth direction and growth rate of the prismatic grid, artificial interaction realizes the rapid and efficient generation of the prismatic grid; the facility of the present invention prevents the growth direction of the prismatic grid from intersecting, ensuring that the prismatic grid In order to achieve the successful generation of the grid, the background structural grid frame is modified by manual interaction to achieve local control and adjustment of the prism grid and improve the quality of the prism grid generation.

Description

technical field [0001] The invention relates to the field of grid generation in computational mechanics, in particular to the grid generation of external flow fields in computational fluid dynamics and a prism grid generation method capable of realizing interactive operations. Background technique [0002] A high-quality discrete grid is the basis for obtaining accurate CFD (Computational Fluid Dynamics, CFD) calculation results. At present, although some efficient commercial grid division software has appeared, grid generation still accounts for about 60% of the CFD workload. Efficient and high-quality meshing is still one of the key research issues facing CFD applications. [0003] Triangular or tetrahedral meshes can automatically fill any two-dimensional or three-dimensional area, and realize the fully automatic generation of meshes with arbitrary complex shapes. However, triangular or tetrahedral meshes are incapable of simulating high Reynolds number boundary layer flo...

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Problems solved by technology

[0007] Aiming at the problem that the advancing normal vector of the complex shape surface is difficult to control in the normal advancing method, it is easy to cause the crossing of the advancing direction and the mesh volume is negative, which leads to the failure of mesh generation, the pre-generated background structure mesh frame is used to control the surface mesh Propel direction, to ensure that the node propulsion direction does not intersect during the generation of the prism grid, and the grid does not have a negative volume, ensuring the success of the prism grid generation;

[0009] Aiming at the problem that the single-layer grid unit generated by the forwarding is not smooth due to the change of the forward step size in the normal push method, and the grid quality is low, the background structure grid frame is used to control the shape of the single-layer grid unit to ensure that the generated prism network grid with high mesh quality

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