Laminar flux

libia87 · April 30, 2012, 05:17

HI!

I have a problem similar like "buoyantBoussinesqSimpleFoam" and I would like to know how to change from turbulent flux to laminar flux because I use this example to simulate my problem.

I do this because i'm new with OpenFOAM and I would like to change the parameters of this tutorial,

Thanks!

nimasam · April 30, 2012, 18:16

Code:

RASModel        laminar;

Linse · May 1, 2012, 10:24

In case the note from nimasam is not explanatory enough (though everything in there is said!), here a bit more in detail:

The files you have to change are both in CASENAME/constant and are named RASProperties and turbulenceProperties.
Within RASProperties you have to set the entry for "RASModel" to something different from "laminar". The different legal options are enumerated in the user guide. You also have to switch "turbulence" to "on".
Within turbulenceProperties you will have to switch to RASModel.

I guess if you want to do a LES-simulation, you should exchange RAS by LES and above explanations are true again... ;-)

Hope that helps!

libia87 · May 2, 2012, 03:45

Quote:

Originally Posted by Linse

In case the note from nimasam is not explanatory enough (though everything in there is said!), here a bit more in detail:

The files you have to change are both in CASENAME/constant and are named RASProperties and turbulenceProperties.
Within RASProperties you have to set the entry for "RASModel" to something different from "laminar". The different legal options are enumerated in the user guide. You also have to switch "turbulence" to "on".
Within turbulenceProperties you will have to switch to RASModel.

I guess if you want to do a LES-simulation, you should exchange RAS by LES and above explanations are true again... ;-)

Hope that helps!

thanks! but in "turbulence" I have to switch to "off" if I want a laminar flux, right??

in the tutorial "BuoyantBoussinesqSimpleFoam" doesn't exist the turbulenceProperties, there are "g", "RASProperties" and "transportProperties"

Tiffany · September 5, 2012, 13:51

I am also trying to use the dummy RAS turbulence model for laminar flow. (I am using buoyantBoussinesqPimpleFoam as my solver though.) I was wondering, what theory is OpenFOAM programed to use for this model? I don't know C++, so I'm struggling trying to figure out what the source code is actually doing. I have a link to it here: https://unihub.ru/tools/ofservice/br...inar/laminar.H

Do you guys know what equations/theory OpenFOAM is using to solve here?

Thank you!

April 30, 2012, 05:17	Laminar flux	#1
libia87 Member anonymous Join Date: Mar 2012 Posts: 45 Rep Power: 14	HI! I have a problem similar like "buoyantBoussinesqSimpleFoam" and I would like to know how to change from turbulent flux to laminar flux because I use this example to simulate my problem. I do this because i'm new with OpenFOAM and I would like to change the parameters of this tutorial, Thanks!

April 30, 2012, 18:16		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,266 Blog Entries: 1 Rep Power: 24	Code: RASModel laminar; lovecraft22 likes this.

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May 1, 2012, 10:24		#3
Linse Senior Member Bernhard Linseisen Join Date: May 2010 Location: Heilbronn Posts: 183 Blog Entries: 1 Rep Power: 15	In case the note from nimasam is not explanatory enough (though everything in there is said!), here a bit more in detail: The files you have to change are both in CASENAME/constant and are named RASProperties and turbulenceProperties. Within RASProperties you have to set the entry for "RASModel" to something different from "laminar". The different legal options are enumerated in the user guide. You also have to switch "turbulence" to "on". Within turbulenceProperties you will have to switch to RASModel. I guess if you want to do a LES-simulation, you should exchange RAS by LES and above explanations are true again... ;-) Hope that helps!

September 5, 2012, 13:51		#5
Tiffany New Member Anonymous Join Date: Aug 2012 Posts: 8 Rep Power: 13	I am also trying to use the dummy RAS turbulence model for laminar flow. (I am using buoyantBoussinesqPimpleFoam as my solver though.) I was wondering, what theory is OpenFOAM programed to use for this model? I don't know C++, so I'm struggling trying to figure out what the source code is actually doing. I have a link to it here: https://unihub.ru/tools/ofservice/br...inar/laminar.H Do you guys know what equations/theory OpenFOAM is using to solve here? Thank you!