B in the tutorials pisoFoam (LES) cases

zxj160 · March 7, 2013, 10:04

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

Bernhard · March 7, 2013, 11:50

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).

zxj160 · March 7, 2013, 13:39

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.

akbarMohammadiAhmar · March 7, 2013, 13:41

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?

zxj160 · March 7, 2013, 17:55

Quote:

Originally Posted by akbarMohammadiAhmar

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.

wyldckat · March 7, 2013, 18:45

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

luuhoangthien · November 28, 2013, 21:51

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

March 7, 2013, 10:04	B in the tutorials pisoFoam (LES) cases	#1
zxj160 Senior Member Jian Zhong Join Date: Feb 2012 Location: Birmingham Posts: 109 Rep Power: 14	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

March 7, 2013, 18:45		#6
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,981 Blog Entries: 45 Rep Power: 128	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 Tobi likes this. __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

November 28, 2013, 21:51		#7
luuhoangthien New Member ThienMa Join Date: Sep 2013 Posts: 8 Rep Power: 13	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 wyldckat likes this.

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March 7, 2013, 11:50		#2
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 22	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).

March 7, 2013, 13:39		#3
zxj160 Senior Member Jian Zhong Join Date: Feb 2012 Location: Birmingham Posts: 109 Rep Power: 14	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.

March 7, 2013, 13:41		#4
akbarMohammadiAhmar New Member Akbar Mohammadi Ahmar Join Date: Oct 2012 Location: Tehran , Iran Posts: 4 Rep Power: 14	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?