基于椭圆光顺的推进格式结构化网格生成技术

提出了一种从结构化初始物面网格出发,结合泊松方程的离散求解、逐层推进的结构化网格的生成技术,并针对不同外形生成了贴体、光滑、正交的流场计算网格;针对具有尖锐凸角/凹角的物面,分别采用不同的网格光顺技术以改善物面拐角处的网格质量;讨论了针对不同拓扑结构网格选择源项的策略,以通过求解泊松方程进行网格光顺,改善网格生成质量。最后,采用几个不同的外形算例来验证该网格生成技术的鲁棒性及有效性,表明该网格生成技术能够针对不同的简单或复杂外形,生成较高质量的流场计算网格。

Improving Structured Grid Generated for Configuration with cute Convex and/or Concave Corners

Aim.Existing methods,which use the solution of elliptic partial differential equation to generate structured grids,meet with serious difficulty at acute convex and/or concave corners.We now present our method that we believe can minimize such difficulty.In the full paper,we explain our method in some detail;in this abstract,we just add some pertinent remarks to naming the first four sections of the full paper.The first section is: generating the grid with the parabolic partial differential equation.In this section,we discuss the grid generation based on the parabolic marching scheme.Section 2 is: generating the reference grid.Section 3 is: smoothing the grid.In this section,we discuss how to apply a special smoothing technique to the configuration with acute convex and/or concave corners to improve grid qualities.Section 4 is: choosing control functions according to the topological structure of a grid.In this section, we generate the body-fitted and smooth grid which is orthogonal to its boundary.Finally,different grids are generated for several simple or complex configurations.The discussion of the results,which are shown in Figs.1 through 9 in the full paper,shows that the method used in this paper to generate grid is robust and efficient.