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Fully developed flow and convergance

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Old   September 10, 2019, 14:17
Default Fully developed flow and convergance
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Soumitra Vadnerkar
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What is connection between a fully developed flow and its convergence?


Can I say, in case of simple flow through pipe scenario, a converged steady state solution would always yield a fully developed flow at the outlet?


Also do you think the attached image of velocity contour can represent a fully developed flow till the time it reaches the outlet?

https://postimg.cc/Dmf1r3hb
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Old   September 10, 2019, 15:33
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Can I say, in case of simple flow through pipe scenario, a converged steady state solution would always yield a fully developed flow at the outlet?
A converged solution does not imply fully developed flow. Flow "development" depends on flow length (i.e. distance of outlet from the inlet) and Reynolds number.
So if the computational domain is not long enough for the flow to be fully developed, you won't get a fully developed flow at the outlet, no matter how good the numerical convergence is. Unless of course you prescribed fully developed conditions at the inlet
The easy way to ensure a fully developed flow would be periodic boundary conditions.
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Old   September 11, 2019, 09:23
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"Fully developed" is a property of a physical flow at hand while "convergence" is a property of a numerical solution. The two have literally nothing to do with each other.
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Old   September 11, 2019, 09:50
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Originally Posted by el_mojito View Post
"Fully developed" is a property of a physical flow at hand while "convergence" is a property of a numerical solution. The two have literally nothing to do with each other.
Yeah but, I thought that as velocity profile does not change further, it might be helping for convergence.
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