FLUENT允许我们在计算时设定间隔保存文件，点击菜单File/wite/autosave...， 初始化时，more setting,选择absolute,initialization options
Solution methods中，激波管中，上面是explicit,下面是implicit
因为对称计算一半时，可在计算前display-Graphics and Animations中镜像另一半 Fluent help 6.4.9 关于transit , UDF引用 Fluent help 6.4.11 系列图片保存
The density-based implicit solver is the solver of choice for compressible, transonic flows without significant regions of low-speed flow.
In cases with significant low-speed flow regions, the pressure-based solver is preferred.
Also, for transient cases with traveling shocks, the density-based explicit solver with explicit time stepping may be the most efficient.