Forum: OpenFOAM Running, Solving & CFD
April 24, 2008, 09:23
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Replies: 98
Views: 17,839
Hi everybody,
I now manage
Hi everybody,
I now manage to get some interesting results on Ahmed test case and on a real race car.
Pressure and velocity fields look not so bad and some vortices can be observed in some...
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Forum: OpenFOAM Running, Solving & CFD
October 29, 2007, 15:19
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Replies: 98
Views: 17,839
Hi Alessandro,
I'm also int
Hi Alessandro,
I'm also interested in your computations since, I am still not sure that the liftDrag utility is computing the drag correctly.
To really compare the values from OpenFOAM and...
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Forum: OpenFOAM Running, Solving & CFD
September 20, 2007, 05:47
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Replies: 98
Views: 17,839
Yes indeed, I don't know why i
Yes indeed, I don't know why it has been change into small leters when copying it on the forum snce it's capital letters in my code.
At least it works for you know.
I made some modifications to...
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Forum: OpenFOAM Running, Solving & CFD
September 19, 2007, 10:06
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Replies: 98
Views: 17,839
@Rajneesh:My turbulent force i
@Rajneesh:My turbulent force is also negative when I do the computations, even using exactly your case.
@Rosario: for the Cd I think you wanted to write:
24.4/(0.5*(0.5*0.288*0.389)*60²)=0.24 ...
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Forum: OpenFOAM Running, Solving & CFD
September 19, 2007, 07:59
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Replies: 98
Views: 17,839
Hi Rosario,
I have one more
Hi Rosario,
I have one more question.
I guess you use your ssimpleFoam solver for the computations.
Could you post the lines:
Total pressure force =
Total viscous force =
Total...
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Forum: OpenFOAM Running, Solving & CFD
September 19, 2007, 05:56
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Replies: 98
Views: 17,839
Hi Rosario,
These are very
Hi Rosario,
These are very good results but we should also check mesh convergence, by refining the mesh of Rajneesh for instance.
Could you post the fvSolution and fvScheme file you are using?...
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Forum: OpenFOAM Running, Solving & CFD
September 18, 2007, 16:53
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Replies: 98
Views: 17,839
Actually, yes, it looks like a
Actually, yes, it looks like a good news.
I didn't understand how OpenFOAM was so far from Fluent, but the mesh difference is certainly one of the reasons.
I'm waiting forward to see what you...
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Forum: OpenFOAM Running, Solving & CFD
September 18, 2007, 05:54
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Replies: 98
Views: 17,839
Hi everybody,
So, unfortuna
Hi everybody,
So, unfortunatly I was right, the drag coefficients were wrong. But as you said, Rajneesh, by changing fvSchemes we get closer to the right values. Actually I changed the schemes...
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Forum: OpenFOAM Running, Solving & CFD
September 17, 2007, 10:59
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Replies: 98
Views: 17,839
Ok, so I guess the drag coeffi
Ok, so I guess the drag coefficient you gave before in this thread should be multiplied by 2.
This actually closer to the results I get by using my own mesh.
Unfortunately this is not a...
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Forum: OpenFOAM Running, Solving & CFD
September 17, 2007, 04:25
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Replies: 98
Views: 17,839
Hi Rajneesh,
I come back t
Hi Rajneesh,
I come back to you after I run your case.
I didn't change anything and the computation went fine to the end.
Now I would like to compute the lift and drag and I get some...
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Forum: OpenFOAM Running, Solving & CFD
September 13, 2007, 05:27
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Replies: 98
Views: 17,839
Hi everybody,
did someone t
Hi everybody,
did someone tried to change the liftDrag utility to account for turbulence. I mean replacing dragCoefficient(...) by turbDragCoefficient(...).
I face a stupid problem. For the...
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Forum: OpenFOAM Running, Solving & CFD
September 12, 2007, 03:50
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Replies: 98
Views: 17,839
Hi Bastil,
As I allready sa
Hi Bastil,
As I allready said , I got the same problems.
What I didn't mentioned earlier is that my mesh was also running fine with other solvers but not with OpenFOAM (1.4.1 at least). So...
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Forum: OpenFOAM Running, Solving & CFD
September 12, 2007, 03:09
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Replies: 98
Views: 17,839
Thanks a lot Rajneesh, I recei
Thanks a lot Rajneesh, I received it.
I just had a look at your mesh and it's totaly different from mine, so it will be very interesting.
I'm going to run it to see what I get, and I'll...
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Forum: OpenFOAM Running, Solving & CFD
September 11, 2007, 16:28
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Replies: 98
Views: 17,839
Hi Bastil,
Looks like OpenF
Hi Bastil,
Looks like OpenFOAM really doesn't like skewed or non orthogonal meshes.
For the ahmed body, I have two different meshes, one passing checkMesh without problem and one reporting...
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Forum: OpenFOAM Running, Solving & CFD
September 11, 2007, 05:37
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Replies: 98
Views: 17,839
Hi BastiL,
I am using a too
Hi BastiL,
I am using a tool name rotationBC posted on this message board by a foam user. Actually, you set up a wall condition on your wheel, and rotationBC is going to compute a non uniform...
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Forum: OpenFOAM Running, Solving & CFD
September 10, 2007, 08:52
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Replies: 98
Views: 17,839
Hi everybody,
It looks like
Hi everybody,
It looks like the liftDrag tool I'm using is not computing my turbulent viscosity part neither.
On a rotating wheel I get lower values for turbulent case with respect to...
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Forum: OpenFOAM Running, Solving & CFD
September 7, 2007, 02:41
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Replies: 98
Views: 17,839
Hi everybody,
Rajneesh, you
Hi everybody,
Rajneesh, your results look great, at least for the pressure drag. That's a good begening.
Could I know a bit more about your configuration:
- which solver are you using? ...
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Forum: OpenFOAM Running, Solving & CFD
September 5, 2007, 02:59
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Replies: 98
Views: 17,839
Hi Rajneesh,
What kind of m
Hi Rajneesh,
What kind of mesh generator are you using your race cars?
Are you going to use the same in OpenFOAM?
And did you get some results on the ahmed bluff body?
Thanks in...
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Forum: OpenFOAM Running, Solving & CFD
August 24, 2007, 10:53
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Replies: 98
Views: 17,839
This is very interesting Rajne
This is very interesting Rajneesh since my model has also a 20deg angle.
Would be great if you could tell me what kind of results you obtain with simpleFoam and eventually settings you are...
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Forum: OpenFOAM Running, Solving & CFD
August 24, 2007, 08:27
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Replies: 98
Views: 17,839
Hmmm, very interesting, Rosari
Hmmm, very interesting, Rosario you made me find something.
I have two computers here, one with OpenFoam 1.4 and one with openfoam 1.4.1. My mesh is generated with GridPro (so hexa multiblock)....
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Forum: OpenFOAM Running, Solving & CFD
August 24, 2007, 06:05
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Replies: 98
Views: 17,839
Hi Rosario,
nu is equal to
Hi Rosario,
nu is equal to 1.475e-05, U=60m/s and the length of the body is 1.044m. So I would say the Reynolds number is around 4.24678e06.
But I tried something much smaller by using nu of...
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Forum: OpenFOAM Running, Solving & CFD
August 24, 2007, 05:42
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Replies: 98
Views: 17,839
Hi Francesco,
Nice to know
Hi Francesco,
Nice to know that somebody succeed. There is some hope!
Actually for my simulation, even running without turbulence doesn't solve the problem.
I would be interested to...
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Forum: OpenFOAM Running, Solving & CFD
August 24, 2007, 04:44
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Replies: 98
Views: 17,839
Hi Cedric,
I saw this probl
Hi Cedric,
I saw this problem regarding RANS and LES.
Looks like the RANS/LES approach is the best way to do it but I guess such approach being experimental so far, it's not implemented in...
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Forum: OpenFOAM Running, Solving & CFD
August 24, 2007, 03:29
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Replies: 98
Views: 17,839
Hi everybody,
First of all
Hi everybody,
First of all thanks Rajneesh for the advise on the book, I received it and it's great.
However I need some help to run the ahmed test case on openfoam. I tried to use...
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Forum: OpenFOAM Running, Solving & CFD
August 10, 2007, 10:21
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Replies: 98
Views: 17,839
Thanks,
I order it on amazon
Thanks,
I order it on amazon right now.
The mesh for the ahmed bluff body is allmost ready and I should be able to get some results next week.
Vincent
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