Accessing LES Delta Values From Solver Code

mchurchf · October 25, 2010, 18:46

Hello,

I am trying to make a modification to buoyantBoussinesqPisoFoam in which the turbulent Prandtl number is a function of the LES filter width. Is there any way to access the LES filter width field from buoyantBoussinesqPisoFoam.C? I tried turbulence->delta(), but that does not work.

Thank you,

Matt

hz283 · December 8, 2012, 16:44

Hi Matt,
Did you solve this problem?
I am using rhoPimpleFoam and LES Smagorinsky model. The filter width delta is used in the simulation. Now I would like to use delta() to output another quantity (it is volScalarField type), and I think I can add somes lines in creatFields.H. However, I had some problems about how to use the fileter delta () in createFields.H of rhoPimpleFoam. Thank you very much.

Sarah13 · June 12, 2023, 04:14

Hi
Can anyone please let me know here that how can I access LES delta in my solver code, as I am new to cpp so I don't have much idea and whatever attempts I made, I wasn't successful. What can I add to createfields to call the LESModel class and access its member function delta in my code.
Thanks in advance

cnsidero · June 12, 2023, 12:43

If you're using rhoPimpleFoam, you should be able to get the deltas with the following:

Code:

turbulence->delta()

Untested though. And if it works, you'll have to be careful using it because the LES delta() function is only available when LESModels are used but rhoPimpleFoam also works with RASModels.

Sarah13 · June 12, 2023, 13:55

Hi Chris
Thanks a lot for your reply. I am using XiFoam solver and the code you mentioned is not working for me, although both rhoPimpleFoam and XiFoam use the same class for momentum transport model.

It is giving me this error.

‘class Foam::CompressibleMomentumTransportModel<Foam::flu idThermo>’ has no member named ‘delta’; did you mean ‘devTau’?

Please if you can help me further regarding this.

Thank you

October 25, 2010, 18:46	Accessing LES Delta Values From Solver Code	#1
mchurchf Member Matthew J. Churchfield Join Date: Nov 2009 Location: Boulder, Colorado, USA Posts: 49 Rep Power: 19	Hello, I am trying to make a modification to buoyantBoussinesqPisoFoam in which the turbulent Prandtl number is a function of the LES filter width. Is there any way to access the LES filter width field from buoyantBoussinesqPisoFoam.C? I tried turbulence->delta(), but that does not work. Thank you, Matt

June 12, 2023, 12:43		#4
cnsidero Senior Member Chris Sideroff Join Date: Mar 2009 Location: Ottawa, ON, CAN Posts: 434 Rep Power: 22	If you're using rhoPimpleFoam, you should be able to get the deltas with the following: Code: turbulence->delta() Untested though. And if it works, you'll have to be careful using it because the LES delta() function is only available when LESModels are used but rhoPimpleFoam also works with RASModels.

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December 8, 2012, 16:44		#2
hz283 Senior Member Join Date: Nov 2012 Posts: 171 Rep Power: 14	Hi Matt, Did you solve this problem? I am using rhoPimpleFoam and LES Smagorinsky model. The filter width delta is used in the simulation. Now I would like to use delta() to output another quantity (it is volScalarField type), and I think I can add somes lines in creatFields.H. However, I had some problems about how to use the fileter delta () in createFields.H of rhoPimpleFoam. Thank you very much.

June 12, 2023, 04:14		#3
Sarah13 New Member Sarah Join Date: Jan 2023 Posts: 12 Rep Power: 3	Hi Can anyone please let me know here that how can I access LES delta in my solver code, as I am new to cpp so I don't have much idea and whatever attempts I made, I wasn't successful. What can I add to createfields to call the LESModel class and access its member function delta in my code. Thanks in advance

June 12, 2023, 13:55		#5
Sarah13 New Member Sarah Join Date: Jan 2023 Posts: 12 Rep Power: 3	Hi Chris Thanks a lot for your reply. I am using XiFoam solver and the code you mentioned is not working for me, although both rhoPimpleFoam and XiFoam use the same class for momentum transport model. It is giving me this error. ‘class Foam::CompressibleMomentumTransportModel<Foam::flu idThermo>’ has no member named ‘delta’; did you mean ‘devTau’? Please if you can help me further regarding this. Thank you