[fireman]

Hi, everyone,

I would like to know what the Courant number is used for? I can understand that CFL number is used to control the time step in couple explicit solver with explicit unsteady formulation. But in couple implicit or explicit solver with implicit unsteady formulation, the time step will be manually specified in the iterate panel, It may imply that the courant number can not control the time step anymore, so why should I need a courant number in these case? Thank you！