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Showing results 1 to 15 of 15 Search took 0.00 seconds. Search: Posts Made By: Joachim

Forum: OpenFOAM July 30, 2013, 14:09

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim Actually, it seems to work. I just needed to be... Actually, it seems to work. I just needed to be more careful with the initial and boundary conditions...

Forum: OpenFOAM July 30, 2013, 13:47

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim Out of curiosity, I tried to use the k-omega... Out of curiosity, I tried to use the k-omega model on some basic test cases. The version implemented in OpenFOAM is the original Wilcox 1988 model. Impossible to get a solution! Has someone...

Forum: OpenFOAM July 30, 2013, 10:22

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim yep, that's right. yep, that's right.

Forum: OpenFOAM July 30, 2013, 10:18

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim If you have y+~1, you can resolve the full... If you have y+~1, you can resolve the full boundary layer, so that you don't need to use any wall function. :) Simply put k=1e-9 and epsilon = 1e-9 at the wall and you should be good!

Forum: OpenFOAM July 30, 2013, 10:11

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim Please try and tell me if you get good results. ... Please try and tell me if you get good results. Personally, I did a low-Re simulation on a 2D airfoil using both models, and the results turned out to be far better with the LaunderSharmaKE model...

Forum: OpenFOAM July 30, 2013, 10:06

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim Did you try the low-Re k-epsilon model currently... Did you try the low-Re k-epsilon model currently implemented in OpenFOAM (LaunderSharmaKE)?

Forum: OpenFOAM July 30, 2013, 09:54

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim Sure. I will. However, one little question. ... Sure. I will. However, one little question. For all RAS models implemented in OF, the production term is defined by 2*nut*magsqr(symm(fvc::grad(U_)), which corresponds to P = tau_{ij} S_{ij}. ...

Forum: OpenFOAM July 30, 2013, 09:37

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim There as been lots of debate whether one should... There as been lots of debate whether one should use the nutUSpaldingWallFunction or not for nut. Personally, I believe that there is no real point in having y+~1 with the current SST model. The wall...

Forum: OpenFOAM July 30, 2013, 09:24

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim The k-w SST model implemented in OpenFOAM... The k-w SST model implemented in OpenFOAM (v2.2.0) seems to be the high-Re version. I am currently implementing the low-Re version. It should not take more than a couple of days I believe. I'll...

Forum: OpenFOAM July 18, 2013, 10:21

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim I had a Courant number of 0.65 max. I read... I had a Courant number of 0.65 max. I read some stuffs regarding the old channelFoam solver. It looks very similar to what the fvOptions file is doing. I guess in the latest version of OpenFOAM,...

Forum: OpenFOAM July 18, 2013, 09:21

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim Hi Jonathan, The DNS data I used were taken... Hi Jonathan, The DNS data I used were taken from "Direct numerical simulation of turbulent channel flow up to Reτ = 590", R.D. Moser, J. Kim and N.N. Mansour, Phys. Fluids 11, 943 (1999)...

Forum: OpenFOAM July 17, 2013, 14:33

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim It seems that the initial conditions have a huge... It seems that the initial conditions have a huge influence on the final solution. I ran the exact same simulation, but using two different initial flow fields: 1. uniform flow field (U =...

Forum: OpenFOAM July 17, 2013, 13:41

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim Hey again, Pretty confusing. Has any of you... Hey again, Pretty confusing. Has any of you already seen something like this in OpenFOAM? (see picture) For this simulation, I used the BC suggested by Jonathan. It seems that the flow...

Forum: OpenFOAM July 17, 2013, 10:24

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim Hi everyone, I am running pimpleFoam for... Hi everyone, I am running pimpleFoam for that one. Actually, I realized that something might have gone wrong during the simulations. Jonathan, the curves are all shown in the previous graph,...

Forum: OpenFOAM July 16, 2013, 17:27

Replies: 58 Why Menter's SST model low-Re issue has not been seriously investigated? Views: 27,159 Posted By Joachim Hi everyone! Really interesting topic! I am... Hi everyone! Really interesting topic! I am currently implementing an hybrid RANS / LES model into OpenFOAM, that would be based on the SST model. I checked the implementation, and it seemed...

Showing results 1 to 15 of 15

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