Prandtl's one-equation RAS turbulence model

Djub · April 3, 2013, 05:30

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, 16:16

Searching for the same,
Any luck!?

Djub · June 9, 2015, 04:59

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, 07:30

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)

April 3, 2013, 05:30	Prandtl's one-equation RAS turbulence model	#1
Djub Senior Member Julien Join Date: Jun 2012 Location: France Posts: 152 Rep Power: 14	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 ?

June 8, 2015, 16:16		#2
Mojtaba.a Senior Member Mojtaba Amiraslanpour Join Date: Jun 2011 Location: Tampa, US Posts: 308 Rep Power: 16	Searching for the same, Any luck!? __________________ Learn OpenFOAM in Persian SFO (StarCCM+ FLUENT OpenFOAM) Project Team Member Complex Heat & Flow Simulation Research Group If you can't explain it simply, you don't understand it well enough. "Richard Feynman"

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June 9, 2015, 04:59		#3
Djub Senior Member Julien Join Date: Jun 2012 Location: France Posts: 152 Rep Power: 14	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...

April 9, 2016, 07:30		#4
Garusen New Member Benoit Join Date: Jul 2015 Location: France Posts: 4 Rep Power: 11	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)