Abstract: 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.

Key words: Navier-Stokes equation, jet mixing flow, high resolution, numerical analysis