Originally Posted by maruthamuthu_venkatraman (Post 221061)

Could anyone give some step by step illustration of implimenting these low reynolds number K omega models in OpenFoam 1.5 as referred in link below:

http://openfoamwiki.net/index.php/Tu...e_models_files

I tried to extract the contents and complied them by typing " wmake libso " in the terminal from incompresible directory.

I got an error

kOmega/kOmega.C:111: error: no matching function for call to ‘Foam::GeometricField<Foam::Tensor<double>, Foam::fvPatchField, Foam::volMesh>::GeometricField(Foam::IOobject, Foam::tmp<Foam::GeometricField<Foam::SymmTensor<do uble>, Foam::fvPatchField, Foam::volMesh> >, Foam::wordList)’ ...................

Let me know the right way of implimenting the same..

Originally Posted by maruthamuthu_venkatraman (Post 221104)

Thanks for your quick Reply.
Presently iam using OF 1.5 version. I cannot see any K omega model which is implimented with low Reynolds number correction.

The SST k omega version is based on HRN version. May be iam wrong, but i cannot see them in src directory... Pls clarify.

Thanks,
Muthu

Originally Posted by maruthamuthu_venkatraman (Post 221148)

Thanks for the directions. I went through the link that you gave me , that SSTF version is also based on High Reynlods number model,i.e. Wall function implimentation.

I prefer the first method i.e. By comparing the changes in src files for 1.5 and 1.4 and modify the same and then shall compile in 1.5 version.

I wonder there must be somebody who might use LRN version of SST k omega models in OF 1.5. If anybody there then just give me the right directions, it will save some time...

Thanks

Originally Posted by maruthamuthu_venkatraman (Post 221563)

Hi ,
I cannot able to find OF 1.4 version in Web to download the src files. I went this main website

http://www.opencfd.co.uk/openfoam/do....html#download

OF 1.4 is not available there. Let me know is there is anyway to download the src files of the same.


Thanks

Originally Posted by lakeat (Post 215308)

Also note on CFD-Online WIKI,
http://www.cfd-online.com/Wiki/Turbu...ary_conditions


I dont see
Am I missing sth??

Originally Posted by barath.ezhilan (Post 224169)

Hi,

@Maruthamuthu Venkatraman,

Were you able to implement the model in OpenFoam 1.5?! If yes, can you please share it!!!

Originally Posted by panara (Post 199274)

Hi Philippose,

I suggest you to read the articles I used as reference for the model implementation (see the Wiki)

in short, the k-omega BSL is a mix of k-omega near the wall and k-epsilon outside the near wall region.
This is done because it is easier to give freestream condition in terms of epsilon rather than omega.

at the wall you have to specify omega using the relation

omega=10*(6*nu)/(0.075*Dy1^2)

where Dy1 is the distance from the wall at the first grid point. Dy1 should be in the laminar sublayer.

In the freestream remember that omega is
equal to epsilon/k.

The k-Omega SST is the same as the BSL but it satisfy also the Bradshaw assumption that the shear stress in a boundary layer is proportional to the turbulent kinetic energy. (see the article for details)

The k-Omega SST sas is very different. In stable flow it behaves exactly as the k-Omega SST but in 3D flows with instabilities it behaves like an LES computation. When instabilities appear the model tends to decrease the turbulent viscosity up to the LES like value. The result is analogous to a LES computation. (see articles for details)

Hope that this helps you,

have fun,
Daniele