模拟高度复杂流动的自适应网格算法

提出一种基于对等弧分布律进行扭转修正的自适应网格算法。该方法将三维网格系统分裂为３个单方向自适应网格子系统，在计算中与主控方程的求解格式相耦合，交替地使用。应用所构造的算法结合ＭａｃＣｏｒｍａｃｋ显式格式对喷流／绕流干扰流场进行了雷诺平均Ｎ－Ｓ方程模拟，给出了清晰的剪切层与激波波系结构。计算结果表明，该自适应网格算法可较大程度地提高ＭａｃＣｏｒｍａｃｋ格式的分辨率。

AN ADAPTIVE-GRID ALGORITHM FOR COMPUTING HIGH SPEED COMPLEX FLOWS

The present paper present an adaptive-grid technique based on a torsion-correction of the arc-equidistribution principle. The technique splits a three-dimensional grid system into a set of three unidimensional,adaptive grid subsystems.By coupling with the governing equation solver,the grid system is generated adaptively using an alternative direction procedure in accordance with some specified local-scaling criteria based on the gradients of certain flow variables. The technique is applied in conjunction with MacCormack's explicit scheme to simulate the jet/external flow interaction using Reynolds averaged Navier-Stokes equations.The computations yield comparatively high resolutions to those flow structures of the shear layers as well as the shock systems,which demonstrates that the present technique can increase substantially the resolution of the MacCormack Scheme.