B in the tutorials pisoFoam (LES) cases
 

Dear Foamers,

I am practicing pisoFom solver for the pitzDaily LES case. I notice 'B' is in the time 0 file. But in later time output files, there is no 'B'. I reviewed the 'creatFields.H' file in the pisoFoam solver, but I did not find a declaration for 'B'.

Does anyone know where can I find the declaration of 'B'? And what does 'B' mean?

My best regards,
Jian

Which LES model are you using?

The tutorial case you refer to uses the oneEqEddy model. If you open oneEqEddy.H (see src folder), you'll see the definition of B (although not used in the code as far as I see).

Yes, I used the oneEqEddy model. In the GenSGSStress.C file in the file of '/apps/OpenFOAM/OpenFOAM-2.1.1/src/turbulenceModels/incompressible/LES/GenSGSStress', I find

B_
(
IOobject
(
"B",
runTime_.timeName(),
mesh_,
IOobject::MUST_READ,
IOobject::AUTO_WRITE
),
mesh_
),

B should be 'AUTO_WRITE' during the running time. But when I run the tutorial case, B is only in the time 0 file. Later, it is gone.

Hi Jian Zhong
B in LES models is Stress tensor similar R in RANS models in OpenFoam.
Have you B in 0 Folder?
I think B is in creditfield and you must see that in creditfield B is defined or no?

I test that if I delete B in time 0， pisoFoam (LES, oneEqEddy model) can still run well for the tutorial pitzDaily case.

Greetings to all!

Those "B" files were removed in OpenFOAM 2.1.x in August 2012: https://github.com/OpenFOAM/OpenFOAM...a52c14701a61d2
This was done around 2 months after 2.1.1 was released.

Best regards,
Bruno

Dear zxj160,

You can modified solver to get R in RANS or B in LES.

view source code Utility R in OpenFOAM to get idea and get B in LES

Thien