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Search: Posts Made By: ariorus
Forum: OpenFOAM Running, Solving & CFD October 19, 2007, 05:32
Replies: 98
Views: 17,716
Posted By ariorus
Yes it is strange that the pro

Yes it is strange that the problem was never noted before, maybe it is because turbulent forces are not usually written as output sepatated by the other ones, or maybe I'm wrong and everything is...
Forum: OpenFOAM Running, Solving & CFD September 24, 2007, 12:32
Replies: 98
Views: 17,716
Posted By ariorus
Hello, I had a look at the

Hello,

I had a look at the liftDrag and have a doubt about how the turbulent force is computed:

turbForce = gSum
(
- mesh.Sf().boundaryField()[patchLabel]
...
Forum: OpenFOAM Running, Solving & CFD September 20, 2007, 13:51
Replies: 98
Views: 17,716
Posted By ariorus
Hello Rajneesh, I totally a

Hello Rajneesh,

I totally agree with you. I don't have time to look at the solution by paraview but if there is no massive separation there must be something wrong in my forces computation....
Forum: OpenFOAM Running, Solving & CFD September 20, 2007, 05:33
Replies: 98
Views: 17,716
Posted By ariorus
Hello Rajneesh, I think tha

Hello Rajneesh,

I think that it may happen that turbulence forces be opposed to the main stream direction even if (of course) turbulent viscosity is always positive.
In fact in k-epsilon...
Forum: OpenFOAM Running, Solving & CFD September 19, 2007, 11:43
Replies: 98
Views: 17,716
Posted By ariorus
@Rajneesh: it would be very st

@Rajneesh: it would be very strange if we got too much different values.. maybe I misunderstood something and/or I'm not running exactly your problem? (I used the mesh you sent me and the setting you...
Forum: OpenFOAM Running, Solving & CFD September 19, 2007, 09:46
Replies: 98
Views: 17,716
Posted By ariorus
Vincent, this are the final

Vincent,

this are the final forces I get:

Total pressure Force = (25.3542 -74.2559 1.36579)
Total viscous Force = (0.888662 -0.0129506 -0.0106971)
Total turbulent Force = (-2.01799...
Forum: OpenFOAM Running, Solving & CFD September 19, 2007, 07:20
Replies: 98
Views: 17,716
Posted By ariorus
I don't know if this is import

I don't know if this is important: I forgot to mention thar I started from upwind scheme and afterward switched to limitedLinear.
Forum: OpenFOAM Running, Solving & CFD September 19, 2007, 07:14
Replies: 98
Views: 17,716
Posted By ariorus
Hello, unfortunately I don'

Hello,

unfortunately I don't have much time to play with the mesh.

I just run the computation after changing k and eps as written before, starting from a uniform velocity of 60 m/s and a...
Forum: OpenFOAM Running, Solving & CFD September 19, 2007, 06:38
Replies: 98
Views: 17,716
Posted By ariorus
Yes probably one of the closes

Yes probably one of the closest to the fluent 2nd order div scheme is Gauss limitedLinear.
By the way using it I found Cd less than 0.24; actually I used a little bit higher values for turbulence...
Forum: OpenFOAM Running, Solving & CFD September 14, 2007, 11:46
Replies: 98
Views: 17,716
Posted By ariorus
Thank you Rajneesh for your an

Thank you Rajneesh for your answer.

Actually I was thinking to use an higher value for turbulence intensity, but I don't know the details of the ahmed body experiment.

Are your result...
Forum: OpenFOAM Running, Solving & CFD September 13, 2007, 11:42
Replies: 98
Views: 17,716
Posted By ariorus
I had written time ago this ap

I had written time ago this application which computed at runtime the forces on a body. It is not too efficient but it should work.
It runs by this command:

ssimpleFoam <root> <case>...
Forum: OpenFOAM Running, Solving & CFD August 24, 2007, 07:27
Replies: 98
Views: 17,716
Posted By ariorus
ooops.. it seems we was writin

ooops.. it seems we was writing at the same time :-)

Just another question:

at the solid face what kind of cell elements do you have? It would be recommendable to have prisms there,...
Forum: OpenFOAM Running, Solving & CFD August 24, 2007, 06:57
Replies: 98
Views: 17,716
Posted By ariorus
Just out of curiosity: what is

Just out of curiosity: what is the Reynolds number in the test you mentioned? What kind of turbulence model are you using in simpleFoam?
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