So, In the yesterday, I post here in community some doubts about the RANS approach to modeling the turbulent flow through a BFS geometry. But, I make a generally post and my really doubt is around the Skin Coefficient Pressure.
I get the velocity field as in experimental study of Jovic and Driver, with reattach length between 6 +- 0.15 x/h and a acceptable Coeficient Pressure results, as we can see in the image below.
But the true doubt is, Why the Cf have this behaviour? Since the experimental data and the physical behavior, for this flow have recirculation zone with negative velocity values near wall and the FLUENT just get positive values to Cf.
Why? Someone Can Help me?
The Cp numerical result is approaching the experimental result as seen in the images, but the Cf is very different and does not assume negative values as it should be.
Why it's occur?
Thanks for opportunity!