Hossam

October 6, 2008 10:35 
Re: corant number help
the courant number controls the time step for the coupled solver. because the coupled solver performs a time marching solution even for steady solvers. as the implicit solver is more stable than the explicit, a larger courant number can be used in order to reach convergence faster. however, it is recommended that you begin the simulation with a small courant number (5 for example) and then increase it when the solution becomes stable. for the explicit solver on the other hand, a courant number of 1 or even smaller is recommended to ensure stability of the solution. that is, the implicit solver will generally reach convergence faster than the explicit because it is more stable and larger time steps (courant values) can be used.
