Learning Forum

[CarbonO2]

Hi, everyone

I used Fluent 2021 R1 to simulate the flow in a long smooth square duct to obtain fully developed turbulence to reproduce a paper. The wall shear stress given by Fluent is about 0.012 pa, but in the paper it is about 0.016 pa. Increasing the number of meshes has little effect on the results. In addition to the physical parameters of the working fluid, other data and boundary conditions are basically consistent with those in the literature. I wonder if this result is credible? Are there any empirical formulas or other methods to verify this result?
This is the boundary condition and my working fluid physical parameter:

 

I exported the data on the variation of the differential of flow velocity with height on the outlet median.  If I use this data to calculate(multiply  -1.9520*10^-5) , it seems to give the right answer, so which data should I trust?

(title "dX-Velocity/dz")
(labels "Position" "dX-Velocity/dz")
((xy/key/label "line-6")
0.125 -825.673
0.1247 -815.572
0.12437 -763.692
0.124007 -644.875
0.123608 -488.059
0.123168 -349.908
0.122685 -252.343

I have only recently started learning CFD, and I am not very familiar with these theories. Sorry to disturb.

[CarbonO2]

 

 

hmmm I don’t know why the image is still so blurred after re-uploading it in the “Edit Post”. Here is a clear version: