Solve Simple foam for laminar flow

nandiganavishal · January 16, 2009, 15:52

Hi All,

I am relatively new to openFoam.. I just finished solving the tutorial for SimpleFoam, but I would like to know how the simple foam is used for laminar flow equations as the k epslon terms are not there for laminar flow right... So how do we change the code to make it work for laminar flow...

Kindly give your suggestions in this regard.

Regards

Vishal

msrinath80 · January 17, 2009, 02:46

In the constant/RASProperties file, set the RASModel to 'laminar' instead of 'kEpsilon' and turbulence to 'off' instead of 'on'.

When running the case, you should then see these messages before the first time step:
--------------
Selecting incompressible transport model Newtonian
Selecting RAS turbulence model laminar
--------------

To find out all the available options, set the 'RASModel' to some arbitrary text, say 'scooby_doo' and then run simpleFoam. The code will then return something like:

Unknown RASModel type scooby_doo

Valid RASModel types are :

15
(
NonlinearKEShih
kEpsilon
realizableKE
LienCubicKELowRe
LienLeschzinerLowRe
LaunderSharmaKE
laminar
SpalartAllmaras
LienCubicKE
LamBremhorstKE
RNGkEpsilon
LRR
QZeta
LaunderGibsonRSTM
kOmegaSST
)

Now, you have a full list of available turbulence models!

mahendra · January 17, 2009, 10:03

What does turbulence when set to "on" or "off" while selecting RASModel laminar mean?

nandiganavishal · January 19, 2009, 14:35

Hi Srinath,

Thanks a lot for the reply. I would like to know if I select these two options, then what should we do for the RASModel transport properties... as there are many property values like kepsilon etc.. similarly in the fvsolution all these k-e values are present.. wat should one do to these parameters...

Kindly let me know...

Regards

Vishal

msrinath80 · January 20, 2009, 01:56

Well, they're not used to my knowledge. So they are just ignored for laminar flow.

January 16, 2009, 15:52	Hi All, I am relatively new	#1
nandiganavishal Senior Member Vishal Nandigana Join Date: Mar 2009 Location: Champaign, Illinois, U.S.A Posts: 208 Rep Power: 18	Hi All, I am relatively new to openFoam.. I just finished solving the tutorial for SimpleFoam, but I would like to know how the simple foam is used for laminar flow equations as the k epslon terms are not there for laminar flow right... So how do we change the code to make it work for laminar flow... Kindly give your suggestions in this regard. Regards Vishal

January 17, 2009, 02:46	In the constant/RASProperties	#2
msrinath80 Senior Member Srinath Madhavan (a.k.a pUl\|) Join Date: Mar 2009 Location: Edmonton, AB, Canada Posts: 703 Rep Power: 21	In the constant/RASProperties file, set the RASModel to 'laminar' instead of 'kEpsilon' and turbulence to 'off' instead of 'on'. When running the case, you should then see these messages before the first time step: -------------- Selecting incompressible transport model Newtonian Selecting RAS turbulence model laminar -------------- To find out all the available options, set the 'RASModel' to some arbitrary text, say 'scooby_doo' and then run simpleFoam. The code will then return something like: Unknown RASModel type scooby_doo Valid RASModel types are : 15 ( NonlinearKEShih kEpsilon realizableKE LienCubicKELowRe LienLeschzinerLowRe LaunderSharmaKE laminar SpalartAllmaras LienCubicKE LamBremhorstKE RNGkEpsilon LRR QZeta LaunderGibsonRSTM kOmegaSST ) Now, you have a full list of available turbulence models!

January 17, 2009, 10:03	What does turbulence when set	#3
mahendra Member Mahendra Join Date: Mar 2009 Location: Pune, Maharashtra, India Posts: 65 Rep Power: 17	What does turbulence when set to "on" or "off" while selecting RASModel laminar mean?

January 19, 2009, 14:35	Hi Srinath, Thanks a lot fo	#4
nandiganavishal Senior Member Vishal Nandigana Join Date: Mar 2009 Location: Champaign, Illinois, U.S.A Posts: 208 Rep Power: 18	Hi Srinath, Thanks a lot for the reply. I would like to know if I select these two options, then what should we do for the RASModel transport properties... as there are many property values like kepsilon etc.. similarly in the fvsolution all these k-e values are present.. wat should one do to these parameters... Kindly let me know... Regards Vishal

January 20, 2009, 01:56	Well, they're not used to my k	#5
msrinath80 Senior Member Srinath Madhavan (a.k.a pUl\|) Join Date: Mar 2009 Location: Edmonton, AB, Canada Posts: 703 Rep Power: 21	Well, they're not used to my knowledge. So they are just ignored for laminar flow.

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