数值模拟主要是采用数值方法来模拟大气的运动和变化规律。大气运动非常复杂，描述它的方程组也非常复杂，目前还没有解析解，只能求它的数值解。计算机是必备条件。(Numerical simulation mainly uses numerical method to simulate the movement and change law of the atmosphere. The motion of the atmosphere is very complex, and the equations describing it are also very complicated. At present, there is no analytic solution, and only the numerical solution of it can be found. A computer is a prerequisite.)