Difference between kEqn and one equation eddy viscosity model for LES simulations
 

Dear FOAMERS,


I was reading a research article, and in that article it was mentioned that they used "one equation eddy viscosity model (OEEVM)", I checked the tutorials for this model but could not get some thing similar. I started searching some platform and found that "kEqn" is actually "one equation eddy viscosity model (OEEVM)". Is it true?

Any suggestion will be great help to me.

Yes, this is true to my knowledge -- just a product of naming change with OpenFOAM version. The kEqn model uses one equation for sgs turbulent kinetic energy transport and is a "one equation" model.

Eg. from OpenFOAM 2.4.x :

And OpenFOAM 7

Aside from general restructuring of turbulence model handling (i.e. muSgs vs nut) sgs viscosity is computed identically.

Caelan

Thanks a lot Caelan for your kind help and clarification. So every thing will be identical I guess in terms of BC for the variables etc? Thanks again

They likely will. Like I said, the turbulence modeling framework has changed a bit between versions (i.e. muSgs to nut) so required SGS variables will change a bit. You could figure out the differences by looking at tutorials from old and new openfoam releases.

Caelan

Thanks for your clarification, unfortunately, I have only OpenFOAM 1906 and don't have an access to other versions. But if I say that I am trying to replicate the results of the paper (which uses one equation eddy viscosity model) using the KEqn model then am I correct to say that I am using the same model as that been used by the paper? Does that make sense?

The code for older versions is always accessible, even if you don't use it -- just google for the repository. Yes it should be the same model.

Caelan

Thanks a lot Caelan for your wonderful help and support.