交互式棱柱网格生成中翘曲现象形成机制及消除算法

doi:10.7527/S1000-6893.2020.24443

Abstract

Abstract: The prismatic grid warping may appear when the normal vectors of the surface grid element change considerably or fast in the interactive prismatic grid generation based on radial basis function interpolation, consequently reducing the quality of the prismatic grid. To solve this problem, this paper first introduced and analyzed the warping phenomenon through the prismatic grid generation of the DLR-F6 wing configuration. Then the formation mechanism was investigated by adding different wave-length disturbances to advancing displacement to simulate the effect of the normal vector variation in a flat plate prismatic grid generation case. The prismatic grid generation results of the flat plate with different disturbances demonstrate that the roughness of the advancing displacement could be magnified by spatial interpolation, thus causing the prismatic grid warping whose appearance depends on the distribution of the advancing displacement. The results above also show that the prismatic grid warping is induced by the roughness of the advancing displacement caused by the changes of normal vectors. Subsequently, a smoothing technology was developed based on the Laplace method inspired by the formation mechanism of grid warping and verified through the DLR-F6 wing configuration case. The test results show that the smoothing technology can completely eliminate the grid warping and obtain high-quality prismatic grids. Finally, the potentiality of the prismatic grid generation method with the smoothing technology was displayed through the grid generation case of the DLR-F6 wing-body configuration.

Key words: prismatic grid generation, warping, radial basis function, displacement disturbances, Laplace method

CLC Number:

V211.3

SUN Yan, JIANG Meng, MENG Dehong, PANG Yufei. Formation mechanism and elimination algorithm of warping in interactive prismatic grid generation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(6): 124443-124443.

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Formation mechanism and elimination algorithm of warping in interactive prismatic grid generation

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