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Forum: OpenFOAM Running, Solving & CFD

August 27, 2010, 18:10

Replies: 39

Reg. LES in OpenFOAM

Views: 21,671

Posted By eugene

Unfortunately, to calculate the mean sgs stress,...

Unfortunately, to calculate the mean sgs stress, will require some coding. You need to add something like this to your solver:

Before the time loop in pisoFoam, e.g. in createFields.H add:
...

Forum: OpenFOAM Running, Solving & CFD

May 28, 2010, 11:13

Replies: 39

Reg. LES in OpenFOAM

Views: 21,671

Posted By eugene

The "average" value that you specify is not what...

The "average" value that you specify is not what is applied to the boundary. If you specify an average value, then the instantaneous mapped data is scaled such that the average of the mapped data...

Forum: OpenFOAM Running, Solving & CFD

May 27, 2010, 05:22

Replies: 39

Reg. LES in OpenFOAM

Views: 21,671

Posted By eugene

Unfortunately, what you want is not possible...

Unfortunately, what you want is not possible without code alteration. I checked the directMapped source code and it only admits a single value. This value fixes the mapped field average at every...

Forum: OpenFOAM Running, Solving & CFD

May 24, 2010, 11:42

Replies: 39

Reg. LES in OpenFOAM

Views: 21,671

Posted By eugene

Its not an average profile, its an average value....

Its not an average profile, its an average value.

average (<x y z>);

for velocity and other vectors.

average <x>;

for temperature and other scalars.

Forum: OpenFOAM Running, Solving & CFD

May 10, 2010, 04:48

Replies: 39

Reg. LES in OpenFOAM

Views: 21,671

Posted By eugene

Hi Deji, The only implementation available...

Hi Deji,

The only implementation available in the standard code for LES inlets is the directMapped boundary for looping stuff back onto the inlet.

You can find an example case here:...

Forum: OpenFOAM Running, Solving & CFD

February 5, 2010, 04:47

Replies: 39

Reg. LES in OpenFOAM

Views: 21,671

Posted By eugene

Hi, The boundary for k is pretty...

Hi,

The boundary for k is pretty straight-forward, since you will have no resolved scale turbulence at the inlet, just set it to the equivalent RANS value. It will adjust really quickly once...

Forum: OpenFOAM Running, Solving & CFD

February 4, 2010, 06:48

Replies: 39

Reg. LES in OpenFOAM

Views: 21,671

Posted By eugene

DES is indeed a hybrid approach. I just assume...

DES is indeed a hybrid approach. I just assume that you would not be able to mesh external aerodynamic cases fine enough to use pure LES. If you do have the meshes to do pure LES, then I suggest you...

Forum: OpenFOAM Running, Solving & CFD

February 2, 2010, 04:39

Replies: 39

Reg. LES in OpenFOAM

Views: 21,671

Posted By eugene

For LES I would suggest pimpleFoam with the...

For LES I would suggest pimpleFoam with the appropriate turbulenceProproperties (LES) settings and boundary conditions. pimpleFoam is like pisoFoam but with incomplete convergence of the corrector...

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