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Showing results 1 to 7 of 7 Search took 0.00 seconds. Search: Posts Made By: maddalena

Forum: OpenFOAM Running, Solving & CFD June 11, 2010, 11:04

Replies: 43 Naca airfoil with too high drag Views: 21,241 Posted By maddalena Indeed cd changes moving the outer boundaries. I... Indeed cd changes moving the outer boundaries. I was able to reduce cd difference of 60% in regards of theoretical value, with boundaries placed 120 chords away. 240 chords did not bring any...

Forum: OpenFOAM Running, Solving & CFD June 11, 2010, 09:19

Replies: 43 Naca airfoil with too high drag Views: 21,241 Posted By maddalena Ah, ok! Your stretching is my cell grading! I am... Ah, ok! Your stretching is my cell grading! I am using 1.1, that is under the limit you pointed out. My mesh quality is quite good, there is no error from checkMesh. I have only certain cells that...

Forum: OpenFOAM Running, Solving & CFD June 11, 2010, 08:27

Replies: 43 Naca airfoil with too high drag Views: 21,241 Posted By maddalena Wait wait wait... you wrote Is stretching... Wait wait wait... you wrote Is stretching different from aspect ratio? Mmm... Indeed, my airfoil is thick. Thus, things are not as bad as I think. :rolleyes: Uhmmm... In any case, from this...

Forum: OpenFOAM Running, Solving & CFD June 11, 2010, 07:52

Replies: 43 Naca airfoil with too high drag Views: 21,241 Posted By maddalena Ok, y+ is not the whole story, but for sure it... Ok, y+ is not the whole story, but for sure it helps! The mesh I generated has an aspect ratio as high as 150 close to the wall :eek:, so that's probably why the lowRe case is not working properly....

Forum: OpenFOAM Running, Solving & CFD June 11, 2010, 05:48

Replies: 43 Naca airfoil with too high drag Views: 21,241 Posted By maddalena Hi Mads, I succeeded in running two different... Hi Mads, I succeeded in running two different cases: a launderSharmaKE case, with an average y+ of 2.5, however cd is 5 times larger than expected, a k-omegaSST case, with an average...

Forum: OpenFOAM Running, Solving & CFD June 10, 2010, 08:51

Replies: 43 Naca airfoil with too high drag Views: 21,241 Posted By maddalena ... But for a high Re model, Y+ should be... ... But for a high Re model, Y+ should be everywhere between 30 and 100, is it right? So your suggestion is to use the finer mesh with a low-Re approach... launderSharmaKE is what I usually choose,...

Forum: OpenFOAM Running, Solving & CFD June 10, 2010, 07:53

Replies: 43 Naca airfoil with too high drag Views: 21,241 Posted By maddalena cd twice the theoretical value Hello everybody, I have the same problem as above: for an airfoil at Re 1.5*10^6, cl matches well with theoretical value, while cd is two times the wanted cd. I am using kOmegaSST as implemented in...

Showing results 1 to 7 of 7

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