基于网格框架的非结构附面层网格生成技术

Grid generation technology of unstructured boundary layer based on grid frame

附面层网格质量是确保计算流体力学粘性计算精度的关键技术环节。本文针对复杂外形提出了全局一致的高质量附面层网格构造算法,该方法基于针对特征的表面网格区域分解技术,利用表面网格分片后的边界线及其法向量构造最终附面层网格的轮廓框架线,并通过径向基函数及线性插值算法生成完整的附面层网格。通过典型算例分析可以看出,该方法生成的非结构附面层网格精度和全局一致性较高,且能够有效避免复杂外形附面层网格局部及全局交叉现象。

The quality of a boundary layer mesh is the key technique to ensure the accuracy of viscous calculations in computational fluid dynamics.This paper proposes a globally consistent high-quality boundary layer mesh construction algorithm for complex shapes.This method is based on the feature-oriented surface mesh domain decomposition technique,using the boundary lines and normal vectors of the surface mesh to construct the final contour frame line of the boundary layer.The contour frame line is used to generate a complete boundary layer mesh through the radial basis function and cubic spline interpolation algorithm.Through the analysis of typical examples,it can be seen that the accuracy and global consistency of the unstructured surface layer mesh generated by this method is high,and it is able to effectively avoid the local and global overlapping phenomenon of the complex shape boundary layer mesh.