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-   -   ahmed body aerodynamics literature review (https://www.cfd-online.com/Forums/openfoam-verification-validation/255049-ahmed-body-aerodynamics-literature-review.html)

geth03 March 15, 2024 11:03

ahmed body aerodynamics literature review
 
1 Attachment(s)
hi all,

i was trying to simulate the ahmed body case with openfoam recently, and no matter how i changed the mesh (inflation/boundary layer thickness, boundary layer cell count, mesh refinement with boxes ...) i could not reach the drag values reported by Ahmed et al. with kOmegaSST and kOmega2006 turbulence models (did not test any other model).

so i did a literature review and searched for publications in which openfoam was used for the ahmed body case. my findings are attached as a screenshot.

as one can see, no publication is consistent with the drag value reported in Ahmed et al.

so i wonder, if it is worth still trying to tweak the numerics to reach the reported values by Ahmed et al. or if the state-of-the-art is not sufficient.

tkeskita May 31, 2024 02:23

Hi,

could you please give the full literature references you found please? Thanks!

geth03 June 13, 2024 04:25

2 Attachment(s)
i have attached the full literature review i found. and also the plot showing experimental cd value versus simulation results. as one can see, the results are scattered with deviations up to +50%.

i could match cd value within a couple percent for the ahmed body (25°), drivaer fastback and drivaer estateback with the same numerics, according to fluent user guide, these should be more accurate. i could not match cd with standard numerics.

(side note: i used k-omega-sst as turbulence model)

tkeskita June 15, 2024 00:44

FYI CFD Support has done a tutorial case about Ahmed body case

geth03 June 15, 2024 03:20

I know. I subscribed to get the tutorial case, because one needs to do that. Unfortunately i did never get the tutorial case. Instead i got tons of emails and ads from that, so i unsubscribed.
Do you have it? If yes, how did you get it?

tkeskita June 16, 2024 00:59

Sorry, no, I don't have it


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