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SimpleFoam: velocity profile does not match analytical solution

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Old   April 7, 2020, 00:58
Default SimpleFoam: velocity profile does not match analytical solution
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Dear Foamers,
I am simulating a reactor with a weird geometry (please find picture attached), with a diffuser section connected to a rectangular duct.
Simulation conditions:
Inlet velocity: 0.55m/s
Reynold's number(at inlet): 1161

The issue: The centerline velocity decreases along the length of the duct, basically the centreline decelerates as it passes through the rectangular duct, whereas it should increase. Therefore, the results are not validated as per existing analytical models.

I am unable to figure where the problem lies, since I have a mesh with no errors. Could you please help me out with this issue. I have attached my fvschemes, fvsolution and the reactor snip along with the velocity vs length profile.

Thank you!
Attached Images
File Type: png reactor snip.png (59.5 KB, 15 views)
Attached Files
File Type: txt fvSchemes.txt (1.3 KB, 1 views)
File Type: txt fvSolution.txt (1.4 KB, 1 views)
File Type: txt checkMesh.txt (3.7 KB, 1 views)
File Type: txt simpleFoam.txt (179.0 KB, 4 views)
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