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February 3, 2012 10:49am UTC

is viscosity controlling for convection problems ?

i tried solving simple 2 D problems .. which did not converge in transient condition .
By Simple i mean , a rectangle (2D) with a simple inflow and & outflow on each end.
So i tried inputting a parameter called viscosity as mu and then made it very high value (towards solid) and then decreased the parameter to that of water .. surprisingly answer converged ?

and my friend too told me a similar aspect stating that "solve it at higher viscosity and sweep it for lower viscosity so that answer will converge" .

is this really so ?

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