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- - **Implicit ddt and Courant Number**
(*http://www.cfd-online.com/Forums/openfoam-solving/72539-implicit-ddt-courant-number.html*)

Implicit ddt and Courant NumberHello, colleagues.
Please, help me with the following problem. I'm solving transport equations (convection + diffusion) for some species using Euler implicit representation of time derivative term (fvm::ddt in solver code and Euler scheme fvSchemes). Such implicit scheme must be unconditionally stable. Why anything crashes if Courant number > 1? I mean iterative process in solving discretized equations diverges. And please, tell me, is there in OpenFOAM of method to solve Navier-Stokes equations for laminar flow, which lets to set Courant number > 1? Best regards, Aleksey. |

Hi Aleksey,
try to use solver pimpleFoam. It's stable for Co > 1. Vojta |

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