文中在简化的大气模型下建立TBM的再入段方程，并采用龙格-库塔法来求解，通过仿真，可以看出模型符合仿真需要。
The paper has brought out functions of the reentry trajectory of TBM in case of the predigest model of atmosphere and solved them by the Runge-Kutta method.
数值离散时，将时间与空间分开进行处理，空间上的离散采用有限体积法，而时间上的离散则用三阶龙格-库塔法，对固壁边界的处理使用了“壁函数”法。
The finite volume approach in space, the three order Runge Kutta method in time and a "law of the wall" for the solid wall condition were used.
应用龙格库塔法解非线性方程得到了该问题的数值解，给出了圆柱体随着柱体高度的直径变化曲线。
The numerical results of the nonlinear formula were obtained by Runge-Kutta method, and we have also obtained the curve of diameter of the example.
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