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why in implicit solvers CO should be limited to convergence?

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Old   December 27, 2012, 10:31
Default why in implicit solvers CO should be limited to convergence?
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i use rhoCentralFoam that solves navier-stokes equations implicitly.but when i set the courant number greater than .1 or even at some cases .05 divergence ocurs.why this is so?
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