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Verification: Couette Flow

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Old   March 28, 2014, 09:58
Default Verification: Couette Flow
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Andrew L. Bloxom
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Hi All,

I'm working on a write-up about code verification and have been performing a comparison with the Couette flow analytical solution to look at the spatial observed order of accuracy. I'm seeing some interesting results where the 2nd order segregated flow solver is converging with at an observed 1st order rate.

I have tried different set-ups with steady flow, primarily:
a) 2D with period interface BC's on the ends and upper wall with tang. vel.
b) 2D with vel. inlet(specified exact inlet profile)/press. outlet BC's on the ends and " "
c) 3D cube with vel. inlet(specified exact inlet profile)/press. outlet BC's, SYM planes, and " "

Also, I ran unsteady and reached the same conclusions. Has anyone else seen this behavior in your studies?
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