非结构网格上N—S方程解法研究及在多段翼型绕流中的应用

在非结构网格上求解N－S方程时，靠近物面的网格伸展比相当大，用有限体积法进行显式求解时不易收敛并且雷诺数有一定的限制。本文采用的人工耗散项中含有网络的方向尺度，因而在不同区域选取不同：在粘性区内该项比物理粘性项小得多，在粘性区外与Jameson的人工耗散项相同。生成非结构网格采用的是层推进技术与传统的阵面推进法相结合的方法，这样能保证在粘中性区内网格有一定的方向规则，而在粘性区外网格完全非结构化。

Computation of the flow past multi-element airfoils using unstructured grid and N-S equations

When we solute the Navier Stokes equations on unstructured triangular meshes, the meshes which are near to the wall have high aspect ratio, using the finite volume approximation'method the integration to steady state is difficult to achieve. In this paper, directional scaling of the artificial dissipation is achieved by considering local mesh stretching vectors at each point, so the artificial dissipation is difference according to the field of computation. The method of generating unstructured triangular grids with some having high aspect ratio is based on a grid marching strategy referred to as advancing layers forconstruction of highly stretched cells in the boundary layer and the conventional advancing front technique for generation of regular, equilateral cells in the inviscid flow region.