[sven]

I want to calculate a turbulent, incompressible flow using a Reynolds Stress Model fur accounting turbulence. Unfortunately, there is no incompressible OpenFOAM solver with such a turbulence Model implemented. However, there are solvers for compressible flow using these models. So, there are two options: 1. using a compressible solver with the RSM Model and apply it to an incompressible flow or 2. taking the RSM Model out of the compressible solver and put it into the incompressibel solver. Has anyone done something similar or has anyone experience with that? Thanks a lot!

[henrik]

Sven,

the incompressible RAS turbulence library contains LRR ($FOAM_SRC/turbulenceModels/RAS/incompressible/LRR/LRR.C) and LaunderGibsonRSTM ($FOAM_SRC/turbulenceModels/RAS/incompressible/LaunderGibsonRSTM/LaunderGibsonRSTM.C). No need to reinvent the wheel.

Henrik

[curiosity]

Hi,

Maybe it´s a bit too late, but I´ve been running a model with LRR and LaunderGibsonRSTM, as you said and the solution doesn´t improve.

The problem is that K-eps model is not good at simulating turbulence near the wall... and both LRR and LaunderGibson are a k-eps variant model.

Now I´m trying to run it with LES models of turbulence. This type of models reproduce this cases better. But the problem is: How can I use the solver buoyantBoussinesqSimpleFoam within LES models of turbulence.

As I have read here:
http://www.openfoam.org/archive/1.6/...ease-notes.php

Turbulence modelling: Major development of turbulence model libraries to give extra flexibility at the solver level. For solvers that can support either RAS/LES computations, the selection is made in the constant/turbulenceProperties, by setting the simulationType keyword to:
laminar,
RASModel,
LESModel

It´s possible to do it, but how?

Thanks in advance

[curiosity]

Originally Posted by henrik

Sven,

the incompressible RAS turbulence library contains LRR ($FOAM_SRC/turbulenceModels/RAS/incompressible/LRR/LRR.C) and LaunderGibsonRSTM ($FOAM_SRC/turbulenceModels/RAS/incompressible/LaunderGibsonRSTM/LaunderGibsonRSTM.C). No need to reinvent the wheel.

Henrik

Hi,

Maybe it´s a bit too late, but I´ve been running a model with LRR and LaunderGibsonRSTM, as you said and the solution doesn´t improve.

The problem is that K-eps model is not good at simulating turbulence near the wall... and both LRR and LaunderGibson are a k-eps variant model.

Now I´m trying to run it with LES models of turbulence. This type of models reproduce this cases better. But the problem is: How can I use the solver buoyantBoussinesqSimpleFoam within LES models of turbulence.

As I have read here:
http://www.openfoam.org/archive/1.6/...ease-notes.php

Turbulence modelling: Major development of turbulence model libraries to give extra flexibility at the solver level. For solvers that can support either RAS/LES computations, the selection is made in the constant/turbulenceProperties, by setting the simulationType keyword to:
laminar,
RASModel,
LESModel

It´s possible to do it, but how?

Thanks in advance