用隐式多重网格法计算实用外形无粘绕流

网格展弦比的好坏严重地影响多重网格的效率。文中细致地处理了多重网格算法的细节，了网格展弦比的影响，发展了一种计算实用外形绕流的隐式多重网格解法，计算效率提高了５倍。

Computing the Real Vehicle Inviscid Flow Field with the Implicit Multigrid Scheme

A multigrid acceleration technique is presented to solve the three dimensional Euler equations about the complex and realistic aerodynamic configurations efficiently in this paper.A diagonalized Beam Warming approximate factorization scheme is used as the basic algorithm in conjunction with the multigrid scheme.Details of the acceleration techniques,which are important for convergence on meshes with high aspect ratio cells,are discussed.Compared with the single mesh code on H O type mesh,the computing time consumption of the multigrid code is greatly reduced.A grid refinement study is conducted to obtain grid converged solution for transonic flow over a wing body combination configuration.Present solutions indicate that the number of multigrid cycles required to achieve a given level of convergence does not increase with the increment of the number of mesh points employed,making it a very attractive scheme for fine meshes.