ddt explicit or implicit with courant number!! -- CFD Online Discussion Forums

December 13, 2010, 12:13	ddt explicit or implicit with courant number!!	#1
mrshb4 Member Mohammad.R.Shetab Join Date: Jul 2010 Posts: 49 Rep Power: 16	Dear Foamers 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: - steadyState - Euler - backward - crankNicolson 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?!! Thank you Mohammadreza

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