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SimpleFoam: velocity profile does not match analytical solution |
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#1 |
New Member
Deutschland (DEU)
Join Date: Jan 2020
Posts: 3
Rep Power: 6 ![]() |
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! |
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#2 | |
Member
MNM
Join Date: Aug 2017
Posts: 69
Rep Power: 9 ![]() |
Hi Abhinav,
Unfortunately, I've to disagree with you ![]() Quote:
Code:
........................... Cell determinant (wellposedness) : minimum: 0.108244 average: 7.7354 Cell determinant check OK. ***Concave cells (using face planes) found, number of cells: 32 <<Writing 32 concave cells to set concaveCells Face interpolation weight : minimum: 0.114561 average: 0.498237 Face interpolation weight check OK. Face volume ratio : minimum: 0.0876268 average: 0.992505 Face volume ratio check OK. Failed 1 mesh checks. End Code:
foamToVTK -cellSets concaveCells -time 0 |
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