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Showing results 1 to 8 of 8 Search took 0.00 seconds. Search: Posts Made By: MadsR

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

Replies: 43 Naca airfoil with too high drag Views: 21,237 Posted By MadsR Okay, sounds good. Thank you for an interesting... Okay, sounds good. Thank you for an interesting discussion :-) Happy foaming, Mads

Forum: OpenFOAM Running, Solving & CFD June 11, 2010, 09:44

Replies: 43 Naca airfoil with too high drag Views: 21,237 Posted By MadsR My investigations on cl/cd sensitivity from... My investigations on cl/cd sensitivity from proximity of outer boundaries show that there can be a substantial influence on the cd (not so much on cl). I am not able to explain that yet, and I would...

Forum: OpenFOAM Running, Solving & CFD June 11, 2010, 08:59

Replies: 43 Naca airfoil with too high drag Views: 21,237 Posted By MadsR Well, maybe I wasn't making myself really clear... Well, maybe I wasn't making myself really clear :-) by [cell-] aspect ratio you would normally mean the ratio between cell-sides and by stretching I was referring to the factor you normally apply...

Forum: OpenFOAM Running, Solving & CFD June 11, 2010, 08:22

Replies: 43 Naca airfoil with too high drag Views: 21,237 Posted By MadsR Mad, An aspect ratio of 150 close to the... Mad, An aspect ratio of 150 close to the wall is nothing :-) I assume that you are using hex-meshes and most modern solvers can handle aspect ratios way into 10,000 or even 100,000 and these...

Forum: OpenFOAM Running, Solving & CFD June 11, 2010, 06:51

Replies: 43 Naca airfoil with too high drag Views: 21,237 Posted By MadsR Mad, I have most experience with the... Mad, I have most experience with the k-omega-SST model so I do not know why you see such bad drag prediction from the L-S model, I know it is widely used for aerodynamics and I have also used it...

Forum: OpenFOAM Running, Solving & CFD June 10, 2010, 09:47

Replies: 43 Naca airfoil with too high drag Views: 21,237 Posted By MadsR Yes for a highRe model y+ should be in that order... Yes for a highRe model y+ should be in that order of magnitude but I am not too surprised that you can't predict drag better than you observe with a highRe model. I would suggest finer mesh with a y+...

Forum: OpenFOAM Running, Solving & CFD June 10, 2010, 08:39

Replies: 43 Naca airfoil with too high drag Views: 21,237 Posted By MadsR Hi Mad In general you will have a hard time... Hi Mad In general you will have a hard time not overpredicting drag and even more so if you have such high y+ as you have. Correct drag prediction is highly dependent on resolving the viscous...

Forum: OpenFOAM Running, Solving & CFD January 27, 2010, 04:05

Replies: 43 Naca airfoil with too high drag Views: 21,237 Posted By MadsR Hi. Any progress here? /Mads Hi. Any progress here? /Mads

Showing results 1 to 8 of 8

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