可压紊流边界层掺混方法力学模型的改进

 本文给出了二维可压紊流边界层的一种改进的掺混算法,方法简单,计算机时短,可用于计算激波后的紊流边界层的发展。六个算例的计算结果表明,本方法具有良好的数值精度。同P.D.史密斯的方法相比,结果有明显的改进。

IMPROVEMENT OF MECHANICAL MODEL IN ENTRAINMENT METHOD FOR COMPRESSIBLE TURBULENT BOUNDARY LAYER

A new improved entrainment method for calculation of compressible turbulent boundary layer is suggested, in which the effect of non-equilibrium turbulent boundary layer on determining entrainment coefficient is taken into account, and a kind of lag-pressure gradient parameter is introduced into calculation of flow field with strong adverse pressure gradient, such as that near shock waves. For evaluation and validation of the method six numerical examples are presented, and the results show good agreement with experimental data. Moreover, in comparison with other threoretical methods the present method is as good as J. E. Green's method, T. Cebeci's method and Reynold's stress equation method, but more efficient in computation, and superior to P. I). Smith's method in approaching to the experimental data. The method is also extended to threedimensional cases.