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3D Rectangular Duct

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Old   July 10, 2019, 15:29
Default 3D Rectangular Duct
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I have a ribbed duct 80*80*200 mm that is heated from sublayer (2000 W/m2 constant heat flux). Reynolds is between 10000 – 30000. I applied an inlet volume 1000 mm to obtain hydrodynamically fully developed flow additionally, also an outlet region 200 mm.



In meshing, I applied first layer thickness for inflation ( y+ = 1 and for different Reynolds number ) but continuity fixed on 10^-3 no reduce. For other residuals no problem. If I use y+ > 11, 30, etc. , the total inflation layer thickness is over my shortest rib so the rib keeps in inflation layer.

Skewness 0,21 and Orthogonal Quality 0,78

I’ve also tried many times in k-w SST, k-e RNG, reducing URF, etc. also but no change.

Does anybody suggest?


Thanks.
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File Type: jpg Residuals.jpg (108.1 KB, 4 views)
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3d rectangular duct, continuity residual, converge

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