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Forum: OpenFOAM Running, Solving & CFD

December 3, 2006, 08:41

Replies: 218

LES

Views: 58,897

Posted By alberto

Hello marhamat, if the grid a

Hello marhamat,
if the grid and the BC's settings are OK, probably it's just a question of time averaging.

Check if your turbulent flow is fully developed and start averaging from that point...

Forum: OpenFOAM Running, Solving & CFD

December 1, 2006, 12:23

Replies: 218

LES

Views: 58,897

Posted By alberto

The results you obtain depends

The results you obtain depends on many factors:

- What's your domain size?
- What's the Reynolds number of your flow?
- What discretisation are you using? I mean what grid density and what...

Forum: OpenFOAM Running, Solving & CFD

November 30, 2006, 08:13

Replies: 218

LES

Views: 58,897

Posted By alberto

I don't have the paper in elec

I don't have the paper in electronic format.

However, if you write the SGS stress tensor as:

tau_ij = -2 * nu_t * S_ij

you can define the eddy viscosity as:

nu_t = Ck * l * sqrt(e)

Forum: OpenFOAM Running, Solving & CFD

November 27, 2006, 07:04

Replies: 218

LES

Views: 58,897

Posted By alberto

You also can find more informa

You also can find more information on this paper:

C.Fureby, G.Tabor, H.Weller and A.D.Gosman, A Comparative Study of Sub Grid Scale Models in Homogeneous Isotropic Turbulence, Physics of Fluids,...

Forum: OpenFOAM Running, Solving & CFD

November 27, 2006, 04:09

Replies: 218

LES

Views: 58,897

Posted By alberto

Hello, you're right, the impl

Hello,
you're right, the implementation of some LES models in OpenFOAM differs a bit from the usual formulation.

However, you can find a short description of each LES model in the header files...

Forum: OpenFOAM Running, Solving & CFD

November 3, 2006, 07:52

Replies: 218

LES

Views: 58,897

Posted By alberto

Compiling perturbU in OpenFOAM

Compiling perturbU in OpenFOAM 1.3 gives this error:

Making dependency list for source file perturbU.C
could not open file fvCFD.H for source file perturbU.C

due to incomplete options...

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