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 sven July 6, 2009 19:28

Reynolds Stress Model incompressible

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 July 8, 2009 06:50

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 August 29, 2012 13:13

LES model for buoyantBoussinesqSimpleFoam

Hi,

Maybe itīs a bit too late, but Iīve been running a model with LRR and LaunderGibsonRSTM, as you said and the solution doesnīt 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 Iīm 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.

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

Itīs possible to do it, but how?

 curiosity August 29, 2012 13:13

Quote:
 Originally Posted by henrik (Post 221899) 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 itīs a bit too late, but Iīve been running a model with LRR and LaunderGibsonRSTM, as you said and the solution doesnīt 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 Iīm 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.