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-   -   Prandtl's one-equation RAS turbulence model (http://www.cfd-online.com/Forums/openfoam-solving/115605-prandtls-one-equation-ras-turbulence-model.html)

 Djub April 3, 2013 04:30

Prandtl's one-equation RAS turbulence model

Hi every Foamers,

I would like to run a steady-state external aerodynamics in Atmospheric Boundary Layer, using the Prandtl's one-equation model with L the mixing length being proportional to the wall distance (something similar to wallDist(mesh_) from LES PrandtlDelta ).
But I can't find any RAS turbulence models (incompressibleRASModels, Foam user guide p.U-100) corresponding! The unique 1 equation model is Spalart-Allmaras but seems very complicated for me.

Does anybody has already implemented the Prandtl's one-equation model for RAS incompressible model ? It seems quite simple to do so. Do you know why it has not been done within OpenFOAM ?

 Mojtaba.a June 8, 2015 15:16

Searching for the same,
Any luck!?

 Djub June 9, 2015 03:59

Hi,

unfortunately, no. No answers, and I did not find. I know another software, Meteodyn WT, using this kind of turbulence modelling, but I wanted to make comparisons...

 Garusen April 9, 2016 06:30

Hey guys,

Actually the Prandlt model can be implemented as the oneEqEddies in LES framework. The values of the length is based on the physical of the flows. Ck = 1, Ce = 0.08.

With verification, the turbulent kinetic energy is, as expected, the variance (as in RANS) and not the tke of the subgridscale (LES)

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