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Role of Courant number in Density solver

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Old   January 20, 2013, 22:18
Angry Role of Courant number in Density solver
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Dave Christopher
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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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courant, density solver

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