ddt explicit or implicit with courant number!!
I want to solve a transient turbomachinery problem using turbDyMFoam. As I've read in OpenFOAM user guide, there are four time discretization that are:
and three latter are implicit. However, when I use them, a courant number also appears. As I know implicit time discretizations are unconditionally stable, then what is this courant number? Does it can be upper than 1 ?!
If no, how should I use a real implicit method?!!
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