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

Aleksey_R February 9, 2010 13:17

Implicit ddt and Courant Number
 
Hello, 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.

betakv February 12, 2010 04:41

Hi Aleksey,

try to use solver pimpleFoam. It's stable for Co > 1.

Vojta


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