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How can we use simpleFoam for laminar flow

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Old   November 21, 2010, 03:24
Default How can we use simpleFoam for laminar flow
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Maryam Mousazadeh
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Hi,
I want to simulate an incompressible laminar flow in steady state.
I know, I should use simpleFoam but I don't know how
please tell me How can I do it.
thank you
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Old   November 21, 2010, 14:57
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Travis Carrigan
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Just set the turbulence model to laminar in RASProperties dictionary.
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Old   November 22, 2010, 03:50
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Maryam Mousazadeh
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hi;
thanks for your help.but I couldn't change any word or number in RASProperties because it's zipped in utilities simpleFoam examples.How can I do it?
and my other problem is that I didn't detetrmine any parameter like epsilon, k, nuTilda, and R in my own case because I didn't need them in laminar flow. is it a mater? if no should I omit these terms in transportProperties or in fvSchems and fvSolution or in simpleFoam's main code?
thanks.
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Old   November 22, 2010, 12:43
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Travis Carrigan
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I think it would be best for you to look through the pitzDaily simpleFoam tutorial. The idea when setting up an OF case is to copy an existing tutorial to your run directory and edit the existing files. In the pitzDaily tutorial you will find RASProperties dictionary and all the other files you need. Simply change the turbulence model to laminar, and that's it.

You will not need k, epsilon, etc.. in you 0/ directory because you will be doing a laminar simulation. Therefore, you can also remove references to these terms in the fvSchemes and fvSolution dictionaries. However, there shouldn't be any reference to these terms in the transportProperties dictionary.

And unless you are going to write your own solver and compile it, try not to edit any of the solvers source code, there's no need to do that when setting up a case.

Hope this helps.
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Old   November 22, 2010, 16:18
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Maryam Mousazadeh
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thanks for your guide. I looked to that case of tutorial and copied it in run directory bat as I said before I can't change the RASProperties code because it's zipped in kuunto version of linux and OpenFOAM-1.5-dev that I'm using. It's my problem. also I tried to make another RASProperties code but I didn't know how could I put it into a zipped file. to run the case correctly.
again I thank you for your helping.
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Old   November 22, 2010, 16:47
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Travis Carrigan
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I'm not quite sure why RASProperties is zipped, unless you haven't unpackaged and built OpenFOAM.
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Old   November 23, 2010, 08:39
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Maryam Mousazadeh
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my problem was resolved and I want to thank you for your kindness.
I wish I would have your guides in future.
thanks a lot ,
Good luck
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Old   November 30, 2010, 06:55
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Maryam Mousazadeh
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Hi,
excuse me, I came across another problem.
When I had deleted the wallFunctionCoeffs from RASProperties as turbulance parameters, I abserved this error:
keyword wallFunctionCoeffs is undefined directory "/home/.../constant/ RASProperties"
However the wallFunctionCoeffs are determined for turbulence flow.
I think, these properties effect in the results, and I don't know what should I do?
thanks
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Old   November 30, 2010, 08:30
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Hi, you can simply re copy it from an existing example.
Good Luck
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Old   November 30, 2010, 09:49
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Maryam Mousazadeh
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I know, but it reply me to enter wallFunctionCoeffs however I don't need them for my own case (laminar flow).
You think entering these prperties dosn't effect in the result of laminar flow?
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Old   November 30, 2010, 12:02
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Quote:
Originally Posted by anijdon View Post
I know, but it reply me to enter wallFunctionCoeffs however I don't need them for my own case (laminar flow).
You think entering these prperties dosn't effect in the result of laminar flow?
did you put in transportproperties file:

RASModel laminar;

turbulence off;

printCoeffs off;
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Old   November 30, 2010, 15:46
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Maryam Mousazadeh
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Yes,I did. But I don't know what's the problem.
why does it ask me these coefficients and not other coefficients?
thank you.
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Old   December 1, 2010, 03:26
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Maryam Mousazadeh
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Quote:
Originally Posted by T.D. View Post
did you put in transportproperties file:

RASModel laminar;

turbulence off;

printCoeffs off;


excuse me, can we use icoFoam in steady state if my problem has not be resolv?how?
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Old   December 1, 2010, 04:52
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Quote:
Originally Posted by anijdon View Post
excuse me, can we use icoFoam in steady state if my problem has not be resolv?how?
yes , but you must change the ddtSchemes in the system/fvSchemes to "steadyState".
Good Luck
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