[chandra shekhar pant]

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.

[clapointe]

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 :

void oneEqEddy::updateSubGridScaleFields()
{
    muSgs_ = ck_*rho()*sqrt(k_)*delta();

}

And OpenFOAM 7

void kEqn<BasicTurbulenceModel>::correctNut()
{
    this->nut_ = Ck_*sqrt(k_)*this->delta();
}

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

Caelan

[chandra shekhar pant]

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

[clapointe]

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

[chandra shekhar pant]

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?

[clapointe]

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

[chandra shekhar pant]

Thanks a lot Caelan for your wonderful help and support.