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-   -   Implementation of the Courant Number and time stepping in BubbleFoam (http://www.cfd-online.com/Forums/openfoam/103107-implementation-courant-number-time-stepping-bubblefoam.html)

Anne Severt June 11, 2012 07:13

Implementation of the Courant Number and time stepping in BubbleFoam
 
Dear all,

Iīm new to OpenFoam and currently working on understanding the procedure of BubbleFoam.

Therefore, I tried to make the calculation of CoNum and Max Ur Courant number as well as SetDeltaT plausible. In CoNum I donīt understand WHY phi is used to get the velocity: u=phi/area. Same in Max Ur Courant number: WHY using |phir|/|Sf| to get |Ur|? And what does the reciprocal of center to center distance projected over the face normal (with a stabilization factor) of cells' shared face "nonOrthDeltaCoeffs" calculate mathematically (why factor 0.05, unit area)? Regarding the time stepping: Where does the factor "deltaTfact" come from? Why does it have such a form (min(min(...)))? Why factor 1.2? Why maxCo/CoNum?

Can anybody please help me understand this?

Thanks.


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