求解双马赫反射问题的各种解法，黎曼求解器包括WENO格式和MDCD格式，时间方向采用Runge-kutta 方法，方程包括Euler方程和NS方程。(Program to solve Double Mach Reflection. Use WENO solver and MDCD solver to solve Riemann problem. Use Runge-Kutta to iterate in time scale. Equations conclude Euler equation

最基本的解常微分方程的方法，包括欧拉法、泰勒级数法、多步法、隐式法、Rung-kutta法等(The basic methods for solving ordinary differential equations include Euler method, Taylor series method, multistep method, implicit method, Rung-kutta method, etc.)