航天飞机头部无粘绕流的无波动,无自由参数格式的数值计算

本文采用气动中心张涵信教授提出的无波动、无自由参数耗散格式(NND)进行了如下的计算:航天飞机头部段对称剖面内的二维无粘绕流;航天飞机头部段三维无粘绕流;轴对称凹陷外形的三维无粘绕流。在物面坐标系下,用代数方程生成计算网格,利用特征相容关系式处理激波和物面边界。为了比较,还用SCM格式进行了计算。结果表明,本文所采用的NND格式,在捕捉流场内激波时不会出现非物理振荡,其收敛速度和所获得的计算结果都是令人满意的。

NUMERICAL COMPUTATION OF INVISCID FLOW AROUNDNOSETIP OF SPACE SHUTTLEWITH NND SCHEME

The NND scheme presented by Prof.Zhang Han Xin of CARDC has been used in this paper to complete the following computa-tions: the two-dimensional inviscid flow around the symmetric plane of nosetip of space shuttle; the three-dimensional inviscid flow around the nosetip of space shuttle; the three-dimensional inviscid flow around axisymmetric indented body. Under the general coordinate system, the computation grids have been generated by algebra equations. The charac-teristic compatibitity equations have been used to treat the shock and body surface boundaries and there is a special treatment in translation of coordinate system. At last, the comparative computations have been completed using second order SCM scheme. The results of computation illustrate that the NND scheme used in this paper can avoid numerical oscillations and high resolution to shock-capturing.