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Showing results 1 to 13 of 13 Search took 0.00 seconds. Search: Posts Made By: fgal

Forum: OpenFOAM Running, Solving & CFD July 12, 2010, 08:19

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal I think I did not understand what you said... I think I did not understand what you said before. -In my previous mesh near the slope i have only two cell. In my new cell three. Here you say that you didn't use the same number of cells in the...

Forum: OpenFOAM Running, Solving & CFD July 12, 2010, 08:11

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal I don't understand why the mesh configuration... I don't understand why the mesh configuration could change the geometry. This is more a problem of how you do the mesh.

Forum: OpenFOAM Running, Solving & CFD July 12, 2010, 07:41

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal I am sorry but I don't understand. I am sorry but I don't understand.

Forum: OpenFOAM Running, Solving & CFD July 12, 2010, 07:28

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal That seems to be better, did you keep the same... That seems to be better, did you keep the same cell height at the wall because of the y+ criteria ? Any improvement in the results ?

Forum: OpenFOAM Running, Solving & CFD July 12, 2010, 07:18

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal I can see two jumps in the size of the cells in... I can see two jumps in the size of the cells in the x directions, of a factor 2 or 3, which is not a good meshing practice. You should use very smooth variations in the cell sizes, in all directions....

Forum: OpenFOAM Running, Solving & CFD July 8, 2010, 13:26

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal Ok, you can then play with that to check if your... Ok, you can then play with that to check if your results can be improved but that should be ok like that. I think that you could use much more cells in the region which you are interested in as you...

Forum: OpenFOAM Running, Solving & CFD July 8, 2010, 12:52

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal There is an utility for that, yPlusRAS, and the... There is an utility for that, yPlusRAS, and the correct range depends if you are using wall functions or not, which you should as you use a coarse mesh. Then the first cell point must be in the...

Forum: OpenFOAM Running, Solving & CFD July 8, 2010, 12:25

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal Have you checked the y+ values ? Are they in the... Have you checked the y+ values ? Are they in the correct range for your turbulence model ?

Forum: OpenFOAM Running, Solving & CFD July 8, 2010, 11:34

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal Are you using 5000 cells in the X direction or ... Are you using 5000 cells in the X direction or 5000 cells on the whole domain ? Is your mesh 2D ? How many cells do you use globally ? Did you refine the mesh close to the obstacle ? Can you post a...

Forum: OpenFOAM Running, Solving & CFD July 6, 2010, 12:16

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal That would more be linked with your mesh I think.... That would more be linked with your mesh I think. If it is sufficiently refined, then the singularity should disappear. It seems to be coarse when I see the x variations of the wss which leads to the...

Forum: OpenFOAM Running, Solving & CFD July 6, 2010, 11:08

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal Ok, so the problem is in your file, can you share... Ok, so the problem is in your file, can you share it? I don't see the problem on the results, you have a recirculation so the flow is stalled after the obstacle so the stress become null at the...

Forum: OpenFOAM Running, Solving & CFD July 6, 2010, 10:22

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal Have you tried this ? gradSchemes { ... Have you tried this ? gradSchemes { default Gauss linearUpwind; } Does Gauss linear works ? Because it is second order so more precise.

Forum: OpenFOAM Running, Solving & CFD July 6, 2010, 09:50

Replies: 31 Recirculation bubble and wall shear stress Views: 5,165 Posted By fgal Hi Daniele, You may have a parenthesis... Hi Daniele, You may have a parenthesis problem in your file. Can you check it and share it if you didn't solve the problem ?

Showing results 1 to 13 of 13

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