Hi,

Is anybody out there doing any work on adding a k-w turbulence model to OpenFOAM? Is anybody, besides me, interested in such a model?

Jason

[eugene]

Not to my knowledge, but if you have any specific questions about its implementation I will be glad to help.

Hi Eugene,

Thanks for the offer of help. I might take you up on that. We are currently doing work here on low-Reynolds number flows in stenosed tubes. The k-w model gives decent results, better than other two-equation models anyway. LES does a great job, but obviously it is quite expensive. I'll have a look at the implementation of the other turbulence models and if I have questions I'll get back to you.

Cheers

Jason

[anger]

Hello Jason,

I would also love to see k-w model implemeted into OpenFOAM.
BTW, which k-w model do you use? The "standard" one (Wilcox, 1988), the improved one (Wilcox, 1998, improved for free shear flows) or any other?

Regards,
Thomas

Hi Thomas,

I'm not sure really. My primary interest is internal flows, for which the original 1988 Wilcox model is probably suitable. My understanding is that the 1998 model improves free shear flow predictions while maintinging the boundary layer abilities of the older model. I guess you get this improvement at the expense of increased complexity in the closure relations for k and w. Any thoughts on this?

What sort of k-w would you be interesting in seeing?

Thanks
Jason

[anger]

Hello Jason,

the basic equations for both models are very similar, so implemetation of the 1988 basis model surely would be a very good (and correct) first step. Afaik, some constants in the 1998 model are no more constant but are calculated from fuctions of the mean flow variables in contrary to the 1988 model.
I'm using a commercial CFD code for the time being which only has the 1988 model implemented so I do not know the difference occuring while applying both models from my own experience.

Regards,
Thomas

Does anyone use the k-w hi-Re model?
Which are the wall function for the 1998 model, if there are any?