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-   -   Role of Courant number in Density solver (http://www.cfd-online.com/Forums/fluent/112035-role-courant-number-density-solver.html)

David Christopher January 20, 2013 23:18

Role of Courant number in Density solver
 
I am using the implicit density solver to analyze the blowdown of a high pressure tank into the atmosphere (supersonic flow). I do not understand the effect of the Courant number on the time step.
Fluent uses the Courant number to control the time step if the eigenvalues become too small. I tracked the time step using the statistics option and did not see any changes in the time step, but Co has a large effect of the result.
The strange result is that a larger Co gives more stable results that I think are better.
How can a larger Co help?


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