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Search took 0.00 seconds. Search: Posts Made By: jlpelerin
Forum: OpenFOAM Running, Solving & CFD June 26, 2008, 08:03
Replies: 57
Views: 25,155
Posted By jlpelerin
Niels, Thanks a lot. I will

Niels,

Thanks a lot. I will start working on it now :-)

Jean-Luc
Forum: OpenFOAM Running, Solving & CFD June 26, 2008, 05:17
Replies: 57
Views: 25,155
Posted By jlpelerin
Niels, Sorry for my first q

Niels,

Sorry for my first question that didn't make any sense... Of course it is a roughness model!

I would be glad to test it. I can run it on pipes and on our geometry.
As it is...
Forum: OpenFOAM Running, Solving & CFD June 26, 2008, 02:54
Replies: 57
Views: 25,155
Posted By jlpelerin
Hi Niels, That is a very go

Hi Niels,

That is a very good news!!!

Do you plan to implement a roughness model?
Do you plan to share it?
Do you need help?

Thank you,
Forum: OpenFOAM Running, Solving & CFD June 23, 2008, 09:05
Replies: 57
Views: 25,155
Posted By jlpelerin
Hi Niels, Accordind to http

Hi Niels,

Accordind to http://www.cfd-online.com/Wiki/SST_k-omega_model the term is from the original model and not OpenFOAM specific. But I have no idea of why this term is used.

Sorry I...
Forum: OpenFOAM Running, Solving & CFD May 26, 2008, 10:28
Replies: 57
Views: 25,155
Posted By jlpelerin
Hi Bart, If your geometry i

Hi Bart,

If your geometry is a "simple" extrusion of a 2D profile, it should not be too difficult to get good results. But if the profile changes periodically along the axis it may become much...
Forum: OpenFOAM Running, Solving & CFD March 4, 2008, 11:47
Replies: 57
Views: 25,155
Posted By jlpelerin
Hi Niels, You are right, ch

Hi Niels,

You are right, channelOodles adds a body force (a constant pressure gradient) to the momentum equation and tries to converge in terms of mass flow. I also thought it would be the...
Forum: OpenFOAM Running, Solving & CFD February 28, 2008, 05:26
Replies: 57
Views: 25,155
Posted By jlpelerin
Hi OpenFoamers, I am still

Hi OpenFoamers,

I am still working on pressure losses in rough pipes and I think I am on the right way for the modified rough k-omega SST (Compared to Moody, results are within 4% except for...
Forum: OpenFOAM Running, Solving & CFD February 22, 2008, 03:44
Replies: 57
Views: 25,155
Posted By jlpelerin
Hi Niels, I have much bette

Hi Niels,

I have much better results on smooth pipes with k-omega SST (less than 5%). (It was just a newbie error : y+ really has to be between 30 and 300, as close as possible from 30)

I...
Forum: OpenFOAM Running, Solving & CFD February 18, 2008, 08:59
Replies: 57
Views: 25,155
Posted By jlpelerin
Sorry the authors are "Antti H

Sorry the authors are "Antti Hellsten and Seppo Laine"
Forum: OpenFOAM Running, Solving & CFD February 18, 2008, 08:55
Replies: 57
Views: 25,155
Posted By jlpelerin
Hi Niels, Thanks a lot for

Hi Niels,

Thanks a lot for your help. I don't have Wilcox (2006), but I have a paper on roughness and SST (Extension of the k-w SST turbulence model for flows over rough surfaces - Antti Hellsen...
Forum: OpenFOAM Running, Solving & CFD February 15, 2008, 08:05
Replies: 57
Views: 25,155
Posted By jlpelerin
Hi Niels, Thank you for you

Hi Niels,

Thank you for your enlightenments. I will have a look at this paper asap.

I cannot find the Wilcox implementation in OpenFOAM. Can you tell me where it is?

I am working on...
Forum: OpenFOAM Running, Solving & CFD February 14, 2008, 10:32
Replies: 57
Views: 25,155
Posted By jlpelerin
Hi OpenFOAMers, I made some

Hi OpenFOAMers,

I made some pressure loss computations inside a straight pipe using simpleFoam at different Reynolds.
Compared to Moody diagram, results are quite disappointing as they give...
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